Incorrect Permission Assignment for Critical Resource Affecting shadow package, versions <1:4.7-1


low

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.08% (35th percentile)
Expand this section
NVD
5.3 medium
Expand this section
Red Hat
4.4 medium

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-DEBIAN11-SHADOW-517331
  • published 15 Feb 2018
  • disclosed 15 Feb 2018

How to fix?

Upgrade Debian:11 shadow to version 1:4.7-1 or higher.

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:11 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.