CVE-2018-13405
linux - security update
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.
How to fix CVE-2018-13405
To remediate CVE-2018-13405, upgrade the affected package to a fixed version below.
- —upgrade to 4.17.6-1 or later
- —upgrade to 4.9.110-3+deb9u1 or later
- —upgrade to 4.9.110-3+deb9u2~deb8u1 or later
Is CVE-2018-13405 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 4.17.6-1
- from 0, < 4.9.110-3+deb9u1
- from 0, < 4.9.110-3+deb9u2~deb8u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |