RHEL 6 : qemu-kvm (RHSA-2015:2694)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated qemu-kvm packages that fix two security issues are now
available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Important
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution
for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides
the user-space component for running virtual machines using KVM.

A heap-based buffer overflow flaw was discovered in the way QEMU's AMD
PC-Net II Ethernet Controller emulation received certain packets in
loopback mode. A privileged user (with the CAP_SYS_RAWIO capability)
inside a guest could use this flaw to crash the host QEMU process
(resulting in denial of service) or, potentially, execute arbitrary
code with privileges of the host QEMU process. (CVE-2015-7504)

A buffer overflow flaw was found in the way QEMU's AMD PC-Net II
emulation validated certain received packets from a remote host in
non-loopback mode. A remote, unprivileged attacker could potentially
use this flaw to execute arbitrary code on the host with the
privileges of the QEMU process. Note that to exploit this flaw, the
guest network interface must have a large MTU limit. (CVE-2015-7512)

Red Hat would like to thank Qinghao Tang of QIHU 360 Marvel Team and
Ling Liu of Qihoo 360 Inc. for reporting the CVE-2015-7504 issue, and
Ling Liu of Qihoo 360 Inc. for reporting the CVE-2015-7512 issue. The
CVE-2015-7512 issue was independently discovered by Jason Wang of Red
Hat.

All qemu-kvm users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. After
installing this update, shut down all running virtual machines. Once
all virtual machines have shut down, start them again for this update
to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2015-7504.html
https://www.redhat.com/security/data/cve/CVE-2015-7512.html
http://rhn.redhat.com/errata/RHSA-2015-2694.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.8
(CVSS2#E:U/RL:ND/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 87637 ()

Bugtraq ID:

CVE ID: CVE-2015-7504
CVE-2015-7512

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