cve/2018/CVE-2018-13405.md

### [CVE-2018-13405](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-13405)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.

### POC

#### Reference
- https://usn.ubuntu.com/3753-2/
- https://www.exploit-db.com/exploits/45033/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/nidhi7598/linux-3.0.35_CVE-2018-13405