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Questions tagged [dirty-cow]

Dirty COW (CVE-2016-5195) is a privilege escalation vulnerability in the Linux Kernel

What is the CVE-2016-5195?

CVE-2016-5195 is the official reference to this bug. CVE (Common Vulnerabilities and Exposures) is the Standard for Information Security Vulnerability Names maintained by MITRE.

Why is it called the Dirty COW bug?

"A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system."

Please visitCVE-2016-5195 for details.

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What is the possible impact of dirtyc0w a.k.a. "Dirty COW" bug?

I heard about Dirty COW but couldn't find any decent writeup on the scope of the bug. It looks like the exploit can overwrite any non-writable file, which makes me guess that local root is possible via substitution of SUID programs. Is that right?…
d33tah
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How to make sure that my operating system is not affected by CVE-2016-5195 (Dirty COW)?

I am running following version of Linux operating system. Distributor ID: Debian Description: Debian GNU/Linux 7.2 (wheezy) Release: 7.2 Codename: wheezy I am not sure whether this version is affected by CVE-2016-5195 Can some one…
Mukesh
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Exploiting Dirty Cow using Metasploit

I'm testing on some of my Linux Virtual Machines trying to exploit the Dirty Cow Vulnerability and I'm not able to success using Metasploit. First of all... for interested users, a couple of links to "Dirty Cow, What is" vulnerability, "Kernels…
OscarAkaElvis
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How do I create an invisible and persistent user on linux?

For my software security class we are required to hack into a server created by our professor. I have hacked into the server, and have the password for the root user. Now that I am root, I would like to ensure I have persistent access to the…
DanielPahor
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Simple explanation of how Dirty COW works?

I am sure many of you remember the XKCD Heartbleed Explanation. In the same spirit, I would like to request an explanation for how the latest branded vulnerability, Dirty COW, works. Is it possible to explain it to someone like me, who have no idea…
Anders
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DirtyCow Vulnerability exploit in ICE 120 image

I am trying to learn Penetration testing. While learning I was trying to practice on my own as well. I had found a vulnerable image called ICE 120 in internet which is a vulnerable web application and was able to get usernames and hashes for the…
Sourish Banerjee
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Dirtycow runs (lib-c to root) fine but crashes on reboot

I have ubuntu 14.04.3 server running in a vm with kernel version 3.13.0-83-generic running. I have tested several PoC's gathered here. Most of them crash the kernel (not all the times but sometimes) and they're not reliable; Except for the lib-c to…
arashkgpt
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Does Linux “Dirty COW” Exploit allow for escalation outside a virtual machine?

Vulnerability CVE–2016–5195 deals with privilege escalation in Linux systems. In a virtual environment with hypervisor KVM and QEMU, can a virtual machine get access to it's host? If not, what is the protective layer here?
Niklas Hagman
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Dirty cow freezing

I checked my Ubuntu PC for dirtycow vulnerability, by using following code I downloaded from here. I compiled and run this code and run.When i execute this code using cc . $ gcc cowroot.c -o cowroot -pthread $./cowroot It's got root access, but…
SuperKrish
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Does Linux "Dirty COW" Exploit allow for privilege escalation with SE protections in place?

Vulnerability CVE–2016–5195 deals with privilege escalation in Linux systems. As far as I can tell, this is by being able to gain write permissions where an attacker might only have read-only permissions. But does this vulnerability also circumvent…
Verbal Kint
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Could not load library libcutils.so while injecting shellcode

I am working on my school thesis. I am trying to inject some shellcode into a shared library using Dirty Cow vulnerability on Android x86. My shellcode is written in asembly and only calls sys_execve with an argument touch /sdcard/FILE.txt. The…
Topper Harley
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kernel panic after exploiting dirty cow on kernel 3.13.0

After exploiting the dirty cow vulnerabillity https://www.exploit-db.com/exploits/40839/ my ubuntu virtual machine keep getting a kernel panic after every reboot. What could possibly cause this behaviour? the vm i tried to root was…
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Is dirtycow unharmful without shell access?

Let's say have a linux server to which only I have shell access and all other users shells are disabled. Is there any reason to be preoccupied?
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Does Dirty COW Affect OSX Kernel?

I attempted to compile the POC for Dirty COW on OSX (Disclaimer: not a C programmer). Here is the error: dirtycow.c: In function ‘procselfmemThread’: dirtycow.c:64:5: warning: implicit declaration of function ‘lseek’…
HashHazard
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Huge Dirty COW - Privileged access to files like with Dirty COW possible?

Has anybody read the Huge Dirty COW writeup? Can we also shmem files using THP and achieve the same result as Dirty COW, privileged access to files?
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