oss-security - Re: CVE-2017-2620 Qemu: display: cirrus: out-of-bounds access issue while in cirrus_bitblt

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Date: Tue, 21 Feb 2017 19:06:00 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Stefano Stabellini <sstabellini@...nel.org>, 
    Gerd Hoffmann <ghoffman@...hat.com>
Subject: Re: CVE-2017-2620 Qemu: display: cirrus: out-of-bounds
 access issue while in cirrus_bitblt_cputovideo

+-- On Tue, 21 Feb 2017, P J P wrote --+
| Quick emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is
| vulnerable to an out-of-bounds access issue. It could occur while copying VGA
| data in cirrus_bitblt_cputovideo.
| 
| A privileged user inside guest could use this flaw to crash the Qemu process
| resulting in DoS OR potentially execute arbitrary code on the host with
| privileges of Qemu process on the host.

Upstream patch:
  -> https://lists.gnu.org/archive/html/qemu-devel/2017-02/msg04700.html

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

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