vulnerability
Debian: CVE-2018-7169: shadow -- security update
Severity | CVSS | Published | Added | Modified |
---|---|---|---|---|
5 | (AV:N/AC:L/Au:N/C:P/I:N/A:N) | 02/15/2018 | 07/30/2024 | 07/30/2024 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
02/15/2018
Added
07/30/2024
Modified
07/30/2024
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.
Solution
debian-upgrade-shadow

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