cve/2018/CVE-2018-13405.md

CVE-2018-13405

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/3753-1/
• https://usn.ubuntu.com/3753-2/
• https://usn.ubuntu.com/3753-2/
• https://www.exploit-db.com/exploits/45033/
• https://www.exploit-db.com/exploits/45033/

Github

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