CVE-2014-2038
Description
The nfs_can_extend_write function in fs/nfs/write.c in the Linux kernel before 3.13.3 relies on a write delegation to extend a write operation without a certain up-to-date verification, which allows local users to obtain sensitive information from kernel memory in opportunistic circumstances by writing to a file in an NFS filesystem and then reading the same file.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2014-2038
Vendor advisory: secalert@redhat.com — https://github.com/torvalds/linux/commit/263b4509ec4d47e0da3e753f85a39ea12d1eff24
Vendor advisory: secalert@redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=1066939
Vendor advisory: secalert@redhat.com — http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.13.3
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 3.13.4-1 |
| debian | bullseye | fixed | 3.13.4-1 |
| debian | forky | fixed | 3.13.4-1 |
| debian | sid | fixed | 3.13.4-1 |
| debian | trixie | fixed | 3.13.4-1 |
| ubuntu | 12.04 | affected | |
| ubuntu | 13.10 | affected | |
| linux-kernel | affected | 3.13.3 |
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=263b4509ec4d47e0da3e753f85a39ea12d1eff24
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.13.3
- http://www.openwall.com/lists/oss-security/2014/02/20/16
- http://www.ubuntu.com/usn/USN-2137-1
- http://www.ubuntu.com/usn/USN-2140-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1066939
- https://github.com/torvalds/linux/commit/263b4509ec4d47e0da3e753f85a39ea12d1eff24
- https://security-tracker.debian.org/tracker/CVE-2014-2038
CWEs
CWE-200
Verify integrity in audit chain (admin only). AS-IS.