Source: shadow Version: 1:4.5-1 Severity: important Tags: security upstream
Hi, the following vulnerability was published for shadow. CVE-2018-7169[0]: | 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. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2018-7169 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7169 [1] https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357 Please adjust the affected versions in the BTS as needed. Regards, Salvatore