Scientific Linux 7: SLSA-2017:0396-1 Critical: qemu-kvm DoS Threat

Date: Thu, 2 Mar 2017 19:30:15 -0000
Reply-To: scientific-linux-users@
Sender: Security Errata for Scientific Linux
 
From: Pat Riehecky 
Subject: Security ERRATA Important: qemu-kvm on SL7.x x86_64
MIME-Version: 1.0
Message-ID: <20170302193015.3515.43153@slpackages.fnal.gov>

Synopsis: Important: qemu-kvm security and bug fix update
Advisory ID: SLSA-2017:0396-1
Issue Date: 2017-03-02
CVE Numbers: CVE-2017-2615
 CVE-2017-2620
--

Security Fix(es):

* 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 via bitblt copy in backward mode. A privileged user
inside a 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. (CVE-2017-2615)

* Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator
support is vulnerable to an out-of-bounds access issue. The issue could
occur while copying VGA data in cirrus_bitblt_cputovideo. A privileged
user inside guest could use this flaw to crash the QEMU process OR
potentially execute arbitrary code on host with privileges of the QEMU
process. (CVE-2017-2620)

Bug Fix(es):

* When using the virtio-blk driver on a guest virtual machine with no
space on the virtual hard drive, the guest terminated unexpectedly with a
"block I/O error in device" message and the qemu-kvm process exited with a
segmentation fault. This update fixes how the system_reset QEMU signal is
handled in the above scenario. As a result, if a guest crashes due to no
space left on the device, qemu-kvm continues running and the guest can be
reset as expected.
--

SL7
 x86_64
 qemu-img-1.5.3-126.el7_3.5.x86_64.rpm
 qemu-kvm-1.5.3-126.el7_3.5.x86_64.rpm
 qemu-kvm-common-1.5.3-126.el7_3.5.x86_64.rpm
 qemu-kvm-debuginfo-1.5.3-126.el7_3.5.x86_64.rpm
 qemu-kvm-tools-1.5.3-126.el7_3.5.x86_64.rpm

- Scientific Linux Development Team