Vulnerability CVE-2018-7169: Information
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.
Severity: MEDIUM (5.3) Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| shadow | sisyphus | 4.5-alt5 | 4.15.1-alt2 | ALT-PU-2019-2549-1 | 236682 | Fixed |
| shadow | sisyphus_e2k | 4.13-alt5 | 4.15.1-alt1 | ALT-PU-2023-3582-1 | - | Fixed |
| shadow | sisyphus_riscv64 | 4.13-alt3 | 4.15.1-alt2 | ALT-PU-2023-3318-1 | - | Fixed |
| shadow | p10 | 4.5-alt5 | 4.5-alt11 | ALT-PU-2019-2549-1 | 236682 | Fixed |
| shadow | p9 | 4.5-alt5 | 4.5-alt8 | ALT-PU-2019-2619-1 | 236683 | Fixed |
| shadow | c10f1 | 4.5-alt5 | 4.5-alt9 | ALT-PU-2019-2549-1 | 236682 | Fixed |
| shadow | c9f2 | 4.5-alt5 | 4.5-alt5 | ALT-PU-2019-2619-1 | 236683 | Fixed |
| shadow | p11 | 4.5-alt5 | 4.15.1-alt1 | ALT-PU-2019-2549-1 | 236682 | Fixed |
References to Advisories, Solutions, and Tools
Hyperlink | Resource |
|---|---|
| https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357 |
|
| GLSA-201805-09 |
|