CVE-2017-5551

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.

4.4

CVSS

Severity: Medium

CVSS 3.0 •

CVSS 2.0 •

EPSS 0.05%

Vendor Advisory debian.org Vendor Advisory kernel.org

Affected: n/a n/a

References

Link	Tags
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=497de07d89c1410d76a15bec2bb41f24a2a89f31	patch third party advisory issue tracking
http://www.openwall.com/lists/oss-security/2017/01/21/3	patch mailing list third party advisory
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.6	release notes vendor advisory
http://www.securityfocus.com/bid/95717	third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=1416126	patch issue tracking
https://github.com/torvalds/linux/commit/497de07d89c1410d76a15bec2bb41f24a2a89f31	patch third party advisory issue tracking
http://www.debian.org/security/2017/dsa-3791	vendor advisory
http://www.securitytracker.com/id/1038053	vdb entry

Frequently Asked Questions

What is the severity of CVE-2017-5551?: CVE-2017-5551 has been scored as a medium severity vulnerability.
How to fix CVE-2017-5551?: To fix CVE-2017-5551, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-5551 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2017-5551 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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