svn commit: r428541 - head/security/vuxml
Jason Unovitch
junovitch at FreeBSD.org
Wed Dec 14 02:45:56 UTC 2016
Author: junovitch
Date: Wed Dec 14 02:45:54 2016
New Revision: 428541
URL: https://svnweb.freebsd.org/changeset/ports/428541
Log:
Document Xen Security Advisory (XSA 200)
Reported by: royger
Security: CVE-2016-9932
Security: https://vuxml.FreeBSD.org/freebsd/80a897a2-c1a6-11e6-ae1b-002590263bf5.html
Modified:
head/security/vuxml/vuln.xml
Modified: head/security/vuxml/vuln.xml
==============================================================================
--- head/security/vuxml/vuln.xml Wed Dec 14 02:38:04 2016 (r428540)
+++ head/security/vuxml/vuln.xml Wed Dec 14 02:45:54 2016 (r428541)
@@ -58,6 +58,44 @@ Notes:
* Do not forget port variants (linux-f10-libxml2, libxml2, etc.)
-->
<vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+ <vuln vid="80a897a2-c1a6-11e6-ae1b-002590263bf5">
+ <topic>xen-kernel -- x86 CMPXCHG8B emulation fails to ignore operand size override</topic>
+ <affects>
+ <package>
+ <name>xen-kernel</name>
+ <range><lt>4.7.1_1</lt></range>
+ </package>
+ </affects>
+ <description>
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <p>The Xen Project reports:</p>
+ <blockquote cite="http://xenbits.xen.org/xsa/advisory-200.html">
+ <p>The x86 instruction CMPXCHG8B is supposed to ignore legacy operand
+ size overrides; it only honors the REX.W override (making it
+ CMPXCHG16B). So, the operand size is always 8 or 16. When support
+ for CMPXCHG16B emulation was added to the instruction emulator,
+ this restriction on the set of possible operand sizes was relied on
+ in some parts of the emulation; but a wrong, fully general, operand
+ size value was used for other parts of the emulation. As a result,
+ if a guest uses a supposedly-ignored operand size prefix, a small
+ amount of hypervisor stack data is leaked to the guests: a 96 bit
+ leak to guests running in 64-bit mode; or, a 32 bit leak to other
+ guests.</p>
+ <p>A malicious unprivileged guest may be able to obtain sensitive
+ information from the host.</p>
+ </blockquote>
+ </body>
+ </description>
+ <references>
+ <cvename>CVE-2016-9932</cvename>
+ <url>http://xenbits.xen.org/xsa/advisory-200.html</url>
+ </references>
+ <dates>
+ <discovery>2016-12-13</discovery>
+ <entry>2016-12-14</entry>
+ </dates>
+ </vuln>
+
<vuln vid="2d56308b-c0a8-11e6-a9a5-b499baebfeaf">
<topic>PHP -- Multiple vulnerabilities</topic>
<affects>
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