oss-security - CVE request: Linux kernel: net: memory corruption with UDP

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Message-ID: <alpine.LFD.2.03.1310251926490.17630@erqung.pbz>
Date: Fri, 25 Oct 2013 19:41:24 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
Subject: CVE request: Linux kernel: net: memory corruption with UDP_CORK and
 UFO

    Hello,

Linux kernel built with an Ethernet driver(ex virtio-net) which has UDP 
Fragmentation Offload(UFO) feature ON is vulnerable to a memory corruption 
flaw when UDP_CORK socket option is set. It could occur when sending large 
messages, wherein all messages are not greater than maximum transfer unit(MTU) 
of the underlying medium.

An unprivileged user/program could use this flaw to crash the kernel resulting 
in DoS, or potentially execute arbitrary code to escalate privileges to gain 
root access to a system.

Upstream fix:
-------------
  -> http://patchwork.ozlabs.org/patch/285292/

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1023477

Thank you.
--
Prasad J Pandit / Red Hat Security Response Team

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