oss-security - CVE request Qemu: OOB access in address_space

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Message-ID: <alpine.LFD.2.20.1603011538510.26817@wniryva>
Date: Tue, 1 Mar 2016 15:47:58 +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: OOB access in address_space_rw leads to segmentation
 fault

   Hello,

Qemu emulator built to use 'address_space_translate' to map an address to a 
MemoryRegionSection is vulnerable to an OOB r/w access issue. It could occur 
while doing pci_dma_read/write calls. Affects Qemu versions >= 1.6.0 and <= 
2.3.1.

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

Upstream patches:
-----------------
   ->  http://git.qemu.org/?p=qemu.git;a=commit;h=c3c1bb99d1c11978d9ce94d1bd
   ->  http://git.qemu.org/?p=qemu.git;a=commit;h=e4a511f8cc6f4a46d409fb5c9f
   ->  http://git.qemu.org/?p=qemu.git;a=commit;h=965eb2fcdfe919ecced6c34803
   ->  http://git.qemu.org/?p=qemu.git;a=commit;h=b242e0e0e2969c044a318e56f7
  [*] https://lists.gnu.org/archive/html/qemu-stable/2016-01/msg00060.html

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1300771

This issue was discovered by  Donghai Zdh 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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