oss-security - CVE request Qemu: net: eepro100: infinite loop in processing command block list

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Date: Wed, 25 Nov 2015 14:26:22 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Qinghao Tang <luodalongde@...il.com>
Subject: CVE request Qemu: net: eepro100: infinite loop in processing command
 block list

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Hash: SHA1

   Hello,

Qemu emulator built with the i8255x (PRO100) emulation support is vulnerable
to an infinite loop issue. It could occur while processing a chain of commands
located in the Command Block List(CBL). Each Command Block(CB) points to the
next command in the list. An infinite loop unfolds if the link to the next
CB points to the same block or there is a closed loop in the chain.

A privileged(CAP_SYS_RAWIO) user inside guest could use this flaw to crash
the Qemu instance resulting in DoS.

Upstream patch:
- ---------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2015-10/msg03911.html


This issue was discovered by Qinghao Tang of QIHU 360 Marvel Team.

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

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