Incorrect Permission Assignment for Critical Resource Affecting shadow package, versions *


low

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.08% (34th percentile)
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NVD
5.3 medium
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Red Hat
4.4 medium

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  • Snyk ID SNYK-DEBIAN9-SHADOW-306229
  • published 15 Feb 2018
  • disclosed 15 Feb 2018

How to fix?

There is no fixed version for Debian:9 shadow.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shadow package and not the shadow package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. This allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.