oss-security - CVE-2015-7504 Qemu: net: pcnet: heap overflow vulnerability in loopback mode

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Message-ID: <alpine.LFD.2.20.1511301427250.21944@wniryva>
Date: Mon, 30 Nov 2015 14:32:00 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Qinghao Tang <luodalongde@...il.com>, Liu Ling <liuling-it@....cn>
Subject: CVE-2015-7504 Qemu: net: pcnet: heap overflow vulnerability in
 loopback mode

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

   Hello,

Qemu emulator built with the AMD PC-Net II Ethernet Controller support is 
vulnerable to a heap buffer overflow flaw. While receiving packets in the 
loopback mode, it appends CRC code to the receive buffer. If the data size 
given is same as the receive buffer size, the appended CRC code overwrites 4 
bytes beyond this 's->buffer' array.

A privileged(CAP_SYS_RAWIO) user inside guest could use this flaw to crash the 
Qemu instance resulting in DoS or potentially execute arbitrary code with 
privileges of the Qemu process on the host.

Upstream fix:
- -------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2015-11/msg06342.html

CVE-2015-7504 has been assigned to this issue by Red Hat Inc.

This issue was independently discovered by Qinghao Tang of QIHU 360 Marvel 
Team and Ling Liu of Qihoo 360 Inc.

Thank you.
- --
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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