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Vigil@nce - Linux kernel: NULL pointer dereference via nf_nat_redirect_ipv4

February 2016 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can force a NULL pointer to be dereferenced in
nf_nat_redirect_ipv4() of the Linux kernel, in order to trigger a
denial of service.

Impacted products: Fedora, Linux, Ubuntu.

Severity: 1/4.

Creation date: 27/01/2016.

DESCRIPTION OF THE VULNERABILITY

The Linux kernel implements the redirection for the IP address
translation in the netfilter/nf_nat_redirect.c file.

However, when an interface is not fully configured, and receives a
packet to translate, the nf_nat_redirect_ipv4() function does not
check if a pointer is NULL, before using it.

An attacker can therefore force a NULL pointer to be dereferenced
in nf_nat_redirect_ipv4() of the Linux kernel, in order to trigger
a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Linux-kernel-NULL-pointer-dereference-via-nf-nat-redirect-ipv4-18829


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