Vulnerability CVE-2016-7097
Published: 2016-10-16

Description:
The filesystem implementation in the Linux kernel through 4.8.2 preserves the setgid bit during a setxattr call, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions.

Type:

CWE-285

 (Improper Authorization)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
3.6/10
4.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=073931017b49d9458aa351605b43a7e34598caef
http://marc.info/?l=linux-fsdevel&m=147162313630259&w=2
http://rhn.redhat.com/errata/RHSA-2017-0817.html
http://www.openwall.com/lists/oss-security/2016/08/26/3
http://www.securityfocus.com/bid/92659
http://www.securitytracker.com/id/1038201
http://www.spinics.net/lists/linux-fsdevel/msg98328.html
http://www.ubuntu.com/usn/USN-3146-1
http://www.ubuntu.com/usn/USN-3146-2
http://www.ubuntu.com/usn/USN-3147-1
https://access.redhat.com/errata/RHSA-2017:1842
https://access.redhat.com/errata/RHSA-2017:2077
https://access.redhat.com/errata/RHSA-2017:2669
https://bugzilla.redhat.com/show_bug.cgi?id=1368938
https://github.com/torvalds/linux/commit/073931017b49d9458aa351605b43a7e34598caef
https://source.android.com/security/bulletin/2017-04-01
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