关联漏洞
标题：
Linux kernel 竞争条件问题漏洞
(CVE-2016-5195)
描述：Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 2.x至4.8.3之前的4.x版本中的mm/gup.c文件存在竞争条件问题漏洞，该漏洞源于程序没有正确处理copy-on-write(COW)功能写入只读内存映射。本地攻击者可利用该漏洞获取权限。
描述
DirtyCow root privilege escalation (CVE-2016-5195)
介绍
# root-dirtyc0w (CVE-2016-5195)
### DirtyCow root privilege escalation
Dirty COW was a race-condition vulnerability in the Linux kernel. This vulnerability lived inside the kernel functions which handle the copy-on-write (COW) feature of memory mappings and when exploited allowed processes to write to read-only files.
An example use case of this vulnerability includes overwriting any SUID (Set User ID) binary such as passwd executable with a different elf executable (which we create) that executes /bin/sh to gain root privileges (as shown in this repository).
You can find more executables in Linux that have the SUID bit set and change them in the exploit code here: https://pentestlab.blog/2017/09/25/suid-executables/
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<img src="/assets/gif/root-dirtyc0w.gif" alt="root-dirtyc0w PoC GIF" width = 70% style="display: block; border: none;">
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<p style="margin-top: 5px;"><em>Privilege Escalation PoC: Exploiting Dirty COW for Root Access (CVE-2016-5195) - Ran on Kali Linux 2016.2</em></p>
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文件快照
[4.0K] /data/pocs/51dcf3d5f5c566b077f6fc63f3c085df26218283
├── [4.0K] assets
│ └── [4.0K] gif
│ └── [694K] root-dirtyc0w.gif
├── [ 138] makefile
├── [1.1K] README.md
└── [4.0K] root-dirtyc0w.c
2 directories, 4 files
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