CVE-2017-5551

Impact:
Moderate
Public Date:
2017-01-09
CWE:
CWE-592
Bugzilla:
1416126: CVE-2017-5551 kernel: S_ISGD is not cleared when setting posix ACLs in tmpfs (CVE-2016-7097 incomplete fix)
A vulnerability was found in the Linux kernel in 'tmpfs' file system. When file permissions are modified via 'chmod' and the user is not in the owning group or capable of CAP_FSETID, the setgid bit is cleared in inode_change_ok(). Setting a POSIX ACL via 'setxattr' sets the file permissions as well as the new ACL, but doesn't clear the setgid bit in a similar way; this allows to bypass the check in 'chmod'.

Find out more about CVE-2017-5551 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.

This flaw was fixed in the Red Hat products as a part of the CVE-2016-7097 fix.

CVSS v3 metrics

CVSS3 Base Score 4.4
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Impact Low
Availability Impact None

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (kernel) RHSA-2017:1842 2017-08-01
Red Hat Enterprise Linux 6 (kernel) RHSA-2017:0817 2017-03-21
Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2017:2669 2017-09-06
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) RHSA-2017:2077 2017-08-01

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 kernel Will not fix

Last Modified
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.