Incorrect Permission Assignment for Critical Resource Affecting shadow package, versions <1:4.7-1
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Test your applications- Snyk ID SNYK-DEBIAN11-SHADOW-517331
- published 15 Feb 2018
- disclosed 15 Feb 2018
Introduced: 15 Feb 2018
CVE-2018-7169 Open this link in a new tabHow 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.