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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 ID SNYK-AMZN2-KERNEL-7678600
  • published 14 Aug 2024
  • disclosed 6 Jul 2018
Report a new vulnerability Found a mistake?

Introduced: 6 Jul 2018

CVE-2018-13405 Open this link in a new tab
CWE-284 Open this link 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
Expand this section

NVD

7.8 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High