Entreprise française de cybersécurité depuis 2004
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☎ 03 60 47 09 81 - info@securiteinfo.com
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.
- https://usn.ubuntu.com/3753-1/
- https://usn.ubuntu.com/3753-2/
- https://www.exploit-db.com/exploits/45033/
- https://github.com/ARPSyndicate/cvemon
- https://github.com/nidhi7598/linux-3.0.35_CVE-2018-13405