[arch-security] [ASA-201703-8] linux: privilege escalation
Santiago Torres-Arias
santiago at archlinux.org
Tue Mar 14 17:46:59 UTC 2017
Arch Linux Security Advisory ASA-201703-8
=========================================
Severity: High
Date : 2017-03-14
CVE-ID : CVE-2017-2636
Package : linux
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-192
Summary
=======
The package linux before version 4.10.2-1 is vulnerable to privilege
escalation.
Resolution
==========
Upgrade to 4.10.2-1.
# pacman -Syu "linux>=4.10.2-1"
The problem has been fixed upstream in version 4.10.2.
Workaround
==========
# echo "install n_hdlc /bin/true" >> /etc/modprobe.d/disable-
n_hdlc.conf
Description
===========
A race condition flaw was found in the N_HLDC Linux kernel driver when
accessing the n_hdlc.tbuf list that can lead to double free. A local,
unprivileged user able to set the HDLC line discipline on the tty
device could use this flaw to crash the system or increase their
privileges on the system.
Impact
======
A local attacker is able to escalate privileges or crash the system.
References
==========
https://bugs.archlinux.org/task/53242
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f2341c94d270421f383641b7cd670e474db56b
http://seclists.org/oss-sec/2017/q1/569
https://security.archlinux.org/CVE-2017-2636
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