[manjaro-security] [arch-security] [ASA-201601-26] linux-lts: privilege escalation
Levente Polyak
anthraxx at archlinux.org
Mon Jan 25 14:08:19 CET 2016
Arch Linux Security Advisory ASA-201601-26
==========================================
Severity: Critical
Date : 2016-01-25
CVE-ID : CVE-2016-0728
Package : linux-lts
Type : privilege escalation
Remote : No
Link : https://wiki.archlinux.org/index.php/CVE
Summary
=======
The package linux-lts before version 4.1.16-1 is vulnerable to local
privilege escalation.
Resolution
==========
Upgrade to 4.1.16-1.
# pacman -Syu "linux-lts>=4.1.16-1"
The problem has been fixed upstream in version 4.1.16.
Workaround
==========
None.
Description
===========
It was reported that possible use-after-free vulnerability in keyring
facility, possibly leading to local privilege escalation, was found.
Function join_session_keyring in security/keys/process_keys.c holds a
reference to the requested keyring, but if that keyring is the same as
the one being currently used by the process, the kernel wouldn't
decrease keyring->usage before returning to userspace. The usage field
can be possibly overflowed causing use-after-free on the keyring object.
Impact
======
A local attacker is able to make use of this vulnerability to elevate
privileges and gain root access to the underlying system.
References
==========
https://access.redhat.com/security/cve/CVE-2016-0728
http://perception-point.io/2016/01/14/analysis-and-exploitation-of-a-linux-kernel-vulnerability-cve-2016-0728/
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=23567fd0
https://bugs.archlinux.org/task/47820
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