oss-security - CVE request Qemu: nvram: OOB r/w access in processing firmware configurations

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Message-ID: <alpine.LFD.2.20.1601112211500.22978@wniryva>
Date: Mon, 11 Jan 2016 22:15:59 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Donghai Zdh <donghai.zdh@...baba-inc.com>
Subject: CVE request Qemu: nvram: OOB r/w access in processing firmware
 configurations

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

   Hello,

Qemu emulator built with the Firmware Configuration device emulation support 
is vulnerable to an OOB r/w access issue. It could occur while processing 
firmware configurations, if the current configuration entry value was set to 
be invalid(FW_CFG_INVALID=0xffff).

A privileged(CAP_SYS_RAWIO) user/process inside guest could use this flaw to 
crash the Qemu process 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/2016-01/msg00428.html

Reference:
- ----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1296060


This issue was discovered by Mr Donghai Zhu of Alibaba 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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