Improper Access Control Affecting kernel package, versions <0:4.14.59-68.43.amzn2


Severity

Recommended
critical

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (1st percentile)

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  • Snyk IDSNYK-AMZN2-KERNEL-7678600
  • published14 Aug 2024
  • disclosed6 Jul 2018

Introduced: 6 Jul 2018

CVE-2018-13405  (opens in a new tab)
CWE-284  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 kernel to version 0:4.14.59-68.43.amzn2 or higher.
This issue was patched in ALAS2-2018-1050.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 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 Scores

version 3.1