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Vigil@nce - Linux kernel: denial of service via nf_ct_frag6_reasm

July 2012 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

When the firewall uses the nf_conntrack_ipv6 module, a remote
attacker can send fragmented packets, in order to stop the kernel.

Severity: 2/4

Creation date: 10/07/2012

IMPACTED PRODUCTS

 Linux kernel

 Red Hat Enterprise Linux

DESCRIPTION OF THE VULNERABILITY

The ip6tables nf_conntrack_ipv6 module is used to track IPv6/TCP
sessions.

When a router sends the message ICMPV6_PKT_TOOBIG, with a MTU
inferior to 1280, the following packets are fragmented, and
nf_conntrack_ipv6 reassembles them.

However, if the following packet is fragment as only one fragment,
the kernel nf_ct_frag6_reasm() function tries to access to the
second fragment, and dereferences a NULL pointer.

When the firewall uses the nf_conntrack_ipv6 module, a remote
attacker can therefore send fragmented packets, in order to stop
the kernel.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-nf-ct-frag6-reasm-11751


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