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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201703-07">
<title>Xen: Privilege Escalation</title>
<synopsis>A vulnerability in Xen's bundled QEMU version might allow privilege
escalation.
</synopsis>
<product type="ebuild">xen</product>
<announced>2017-03-28</announced>
<revised count="1">2017-03-28</revised>
<bug>609120</bug>
<access>local</access>
<affected>
<package name="app-emulation/xen-tools" auto="yes" arch="*">
<unaffected range="ge">4.7.1-r8</unaffected>
<vulnerable range="lt">4.7.1-r8</vulnerable>
</package>
</affected>
<background>
<p>Xen is a bare-metal hypervisor.</p>
</background>
<description>
<p>In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine
cirrus_bitblt_cputovideo fails to check wethehr the specified memory
region is safe.
</p>
</description>
<impact type="normal">
<p>A local attacker could potentially execute arbitrary code with
privileges of Xen (QEMU) process on the host, gain privileges on the host
system, or cause a Denial of Service condition.
</p>
</impact>
<workaround>
<p>Running guests in Paravirtualization (PV) mode, or running guests in
Hardware-assisted virtualizion (HVM) utilizing stub domains mitigate
the issue.
</p>
<p>Running HVM guests with the device model in a stubdomain will mitigate
the issue.
</p>
<p>Changing the video card emulation to stdvga (stdvga=1, vga=”stdvga”,
in the xl domain configuration) will avoid the vulnerability.
</p>
</workaround>
<resolution>
<p>All Xen Tools users should upgrade to the latest version:</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose
">=app-emulation/xen-tools-4.7.1-r8"
</code>
</resolution>
<references>
<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-2620">CVE-2017-2620</uri>
</references>
<metadata tag="requester" timestamp="2017-02-24T02:24:45Z">BlueKnight</metadata>
<metadata tag="submitter" timestamp="2017-03-28T03:15:18Z">whissi</metadata>
</glsa>
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