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