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House of Gods Heap Exploitation Technique

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# House of Gods - Arena Hijacking Technique

House-of-Gods is a new heap exploitation technique for older versions of the GNU C Library (< glibc 2.27). There
are currently two different revisions of the same exploit. The first revision is way more inefficient and less
applicable in real world scenarios compared to the second revision.

The goal of both revisions is to hijack the ```thread_arena``` by corrupting the ```malloc_state.next``` pointer.

## Revision 1

This revision requires a lot of allocations i.e. 200 allocations on my test-system. The exact number is
system dependent. The rootcause is a repeatable WAF on an unsorted-chunk.

Paper: https://github.com/Milo-D/house-of-gods/blob/master/rev1/HOUSE_OF_GODS.TXT

## Revision 2

This revision hijacks the arena within only 8 allocations and drops a shell after a total of 10 allocations.
Furthermore, only a single WAF bug on an unsorted-chunk is needed in order to launch the attack.

Paper: https://github.com/Milo-D/house-of-gods/blob/master/rev2/HOUSE_OF_GODS.TXT

## how2heap

A how2heap tutorial of the second revision can be now found here https://github.com/shellphish/how2heap/blob/master/glibc_2.24/house_of_gods.c

## glibc bug report

The second revision takes advantage of inappropriate malloc behaviour, which is still present in the most
recent version of glibc. Although a rather minor issue with low priority, the bug was filed
here https://sourceware.org/bugzilla/show_bug.cgi?id=29709

## Proof of Concept

For both revision, type

```console
./patch && ./exploit.py
```

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