CVE-2018-18955
- State
- Published
- Severity
- Not scored
- Published
- Nov 16, 2018
- Updated
- Aug 5, 2024
- Reserved
- Nov 5, 2018
Description
In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction.
Scores
The record has no CVSS score.
Weaknesses
The record names no weakness.
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
References
- https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19
- USN-3836-2vendor-advisory
- USN-3835-1vendor-advisory
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1712
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd
- USN-3833-1vendor-advisory
- USN-3832-1vendor-advisory
- 45915exploit
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2
- 45886exploit
- USN-3836-1vendor-advisory
- 105941vdb-entry
- https://support.f5.com/csp/article/K39103040
- https://security.netapp.com/advisory/ntap-20190416-0003/
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