Vigil@nce - Linux kernel: use after free via ppp_unregister_channel
July 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can force the usage of a freed memory area in
ppp_unregister_channel() of the Linux kernel, in order to trigger
a denial of service, and possibly to run code.
Impacted products: Debian, Linux, openSUSE Leap, SUSE Linux
Enterprise Desktop, SLES, Ubuntu.
Severity: 2/4.
Creation date: 12/05/2016.
DESCRIPTION OF THE VULNERABILITY
The Linux kernel can clone a process via clone().
However, during this operation, the ppp_unregister_channel()
function frees a memory area before reusing it.
An attacker can therefore force the usage of a freed memory area
in ppp_unregister_channel() of the Linux kernel, in order to
trigger a denial of service, and possibly to run code.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Linux-kernel-use-after-free-via-ppp-unregister-channel-19601