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.

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

https://support.f5.com/csp/article/K31603170?utm_source=f5support&utm_medium=RSS

Details

Risk Information

CVSS v2

CVSS v3