CVE-2018-7169
published 2018-02-15CVE-2018-7169: 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…
medium5.3CVSS 3.0
AVNACLPRNUINSUCLINAN
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.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | shadow | < shadow 1:4.7-1 (bookworm) | shadow 1:4.7-1 (bookworm) |
| shadow_project | shadow | — | — |
| shadow_project | shadow | >= 0 < 1:4.7-1 | 1:4.7-1 |
| shadow_project | shadow | >= 0 < 1:4.7-1 | 1:4.7-1 |
| shadow_project | shadow | >= 0 < 1:4.7-1 | 1:4.7-1 |
| shadow_project | shadow | >= 0 < 1:4.7-1 | 1:4.7-1 |
| shadow_project | shadow | >= 0 < 1:4.5-1ubuntu2.2 | 1:4.5-1ubuntu2.2 |
| shadow_project | shadow | >= 0 < 1:4.1.5.1-1ubuntu9.5+esm1 | 1:4.1.5.1-1ubuntu9.5+esm1 |
| shadow_project | shadow | >= 0 < 1:4.2-3.1ubuntu5.5+esm1 | 1:4.2-3.1ubuntu5.5+esm1 |
CVSS provenance
nvdv3.05.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
osv9.8CRITICAL