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LIN10-3341 : Security Advisory - shadow - CVE-2018-7169

Created: Feb 27, 2018    Updated: Dec 3, 2018
Resolved Date: Mar 18, 2018
Found In Version: 10.17.41.1
Fix Version: 10.17.41.5
Severity: Standard
Applicable for: Wind River Linux LTS 17
Component/s: Userspace

Description

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.

https://nvd.nist.gov/vuln/detail/CVE-2018-7169

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