Vulnerability in Linux Kernel
CVE-2017-5551
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Public proof-of-concept exploits
References
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Third Party Advisory, Issue Tracking)
- www.openwall.com/lists/oss-security/2017/01/21/3 (mailing-list, Patch, Mailing List, Third Party Advisory)
- www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6 (Release Notes, Vendor Advisory)
- www.securityfocus.com/bid/95717 (VDB Entry, Third Party Advisory, vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (Patch, Issue Tracking)
- github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31 (Patch, Third Party Advisory, Issue Tracking)
- www.debian.org/security/2017/dsa-3791 (vendor-advisory)
- www.securitytracker.com/id/1038053 (vdb-entry)
Frequently asked questions
- What is CVE-2017-5551?
- CVE-2017-5551 is a medium-severity vulnerability in Linux Kernel. CVSS score: 4.4/10. Published 2017-02-06.
- How severe is CVE-2017-5551?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2017-5551 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.