Improper Privilege Management Affecting linux-4.9 package, versions <4.9.110-3+deb9u2~deb8u1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
1.04% (63rd percentile)

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  • Snyk IDSNYK-DEBIAN8-LINUX49-263055
  • published11 Jul 2018
  • disclosed6 Jul 2018

Introduced: 6 Jul 2018

CVE-2018-13405  (opens in a new tab)
CWE-269  (opens in a new tab)

How to fix?

Upgrade Debian:8 linux-4.9 to version 4.9.110-3+deb9u2~deb8u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-4.9 package and not the linux-4.9 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

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.

References

CVSS Base Scores

version 3.1