Vulnerability Description
The simple_set_acl function in fs/posix_acl.c in the Linux kernel before 4.9.6 preserves the setgid bit during a setxattr call involving a tmpfs filesystem, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-7097.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 4.9.5 |
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de0Issue TrackingPatchThird Party Advisory
- http://www.debian.org/security/2017/dsa-3791
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6Release NotesVendor Advisory
- http://www.openwall.com/lists/oss-security/2017/01/21/3Mailing ListPatchThird Party Advisory
- http://www.securityfocus.com/bid/95717Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038053
- https://bugzilla.redhat.com/show_bug.cgi?id=1416126Issue TrackingPatch
- https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f3Issue TrackingPatchThird Party Advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de0Issue TrackingPatchThird Party Advisory
- http://www.debian.org/security/2017/dsa-3791
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6Release NotesVendor Advisory
- http://www.openwall.com/lists/oss-security/2017/01/21/3Mailing ListPatchThird Party Advisory
- http://www.securityfocus.com/bid/95717Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038053
- https://bugzilla.redhat.com/show_bug.cgi?id=1416126Issue TrackingPatch
FAQ
What is CVE-2017-5551?
CVE-2017-5551 is a vulnerability with a CVSS score of 4.4 (MEDIUM). The simple_set_acl function in fs/posix_acl.c in the Linux kernel before 4.9.6 preserves the setgid bit during a setxattr call involving a tmpfs filesystem, which allows local users to gain group priv...
How severe is CVE-2017-5551?
CVE-2017-5551 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-5551?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.