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Vigil@nce - Linux kernel: privilege escalation via SOL_PPPOL2TP

August 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can use a L2TP socket when the Linux kernel is
compiled with SOL_PPPOL2TP, in order to escalate his privileges.

Impacted products: Debian, Fedora, Linux, RHEL, Ubuntu

Severity: 2/4

Creation date: 17/07/2014

DESCRIPTION OF THE VULNERABILITY

The Linux kernel can be configured with CONFIG_PPPOL2TP (PPP over
L2TP).

However, the pppol2tp_setsockopt() function modifies UDP data
structures instead of L2TP.

An attacker can therefore use a L2TP socket when the Linux kernel
is compiled with SOL_PPPOL2TP, in order to escalate his privileges.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-privilege-escalation-via-SOL-PPPOL2TP-15063


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