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73 lines
4.6 KiB
Markdown
73 lines
4.6 KiB
Markdown
# House of Lore | Small bin Attack
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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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### Code
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* Check the one from [https://ctf-wiki.mahaloz.re/pwn/linux/glibc-heap/house\_of\_lore/](https://ctf-wiki.mahaloz.re/pwn/linux/glibc-heap/house\_of\_lore/)
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* This isn't working
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* Or: [https://github.com/shellphish/how2heap/blob/master/glibc\_2.39/house\_of\_lore.c](https://github.com/shellphish/how2heap/blob/master/glibc\_2.39/house\_of\_lore.c)
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* This isn't working even if it tries to bypass some checks getting the error: `malloc(): unaligned tcache chunk detected`
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* This example is still working: [**https://guyinatuxedo.github.io/40-house\_of\_lore/house\_lore\_exp/index.html**](https://guyinatuxedo.github.io/40-house\_of\_lore/house\_lore\_exp/index.html) 
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### Goal
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* Insert a **fake small chunk in the small bin so then it's possible to allocate it**.\
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Note that the small chunk added is the fake one the attacker creates and not a fake one in an arbitrary position.
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### Requirements
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* Create 2 fake chunks and link them together and with the legit chunk in the small bin:
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* `fake0.bk` -> `fake1`
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* `fake1.fd` -> `fake0`
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* `fake0.fd` -> `legit` (you need to modify a pointer in the freed small bin chunk via some other vuln)
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* `legit.bk` -> `fake0`
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Then you will be able to allocate `fake0`.
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### Attack
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* A small chunk (`legit`) is allocated, then another one is allocated to prevent consolidating with top chunk. Then, `legit` is freed (moving it to the unsorted bin list) and the a larger chunk is allocated, **moving `legit` it to the small bin.**
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* An attacker generates a couple of fake small chunks, and makes the needed linking to bypass sanity checks:
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* `fake0.bk` -> `fake1`
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* `fake1.fd` -> `fake0`
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* `fake0.fd` -> `legit` (you need to modify a pointer in the freed small bin chunk via some other vuln)
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* `legit.bk` -> `fake0`
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* A small chunk is allocated to get legit, making **`fake0`** into the top list of small bins
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* Another small chunk is allocated, getting `fake0` as a chunk, allowing potentially to read/write pointers inside of it.
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## References
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* [https://ctf-wiki.mahaloz.re/pwn/linux/glibc-heap/house\_of\_lore/](https://ctf-wiki.mahaloz.re/pwn/linux/glibc-heap/house\_of\_lore/)
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* [https://heap-exploitation.dhavalkapil.com/attacks/house\_of\_lore](https://heap-exploitation.dhavalkapil.com/attacks/house\_of\_lore)
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* [https://guyinatuxedo.github.io/40-house\_of\_lore/house\_lore\_exp/index.html](https://guyinatuxedo.github.io/40-house\_of\_lore/house\_lore\_exp/index.html)
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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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|
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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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