Date: Wed, 14 Dec 2016 02:45:54 +0000 (UTC) From: Jason Unovitch <junovitch@FreeBSD.org> To: ports-committers@freebsd.org, svn-ports-all@freebsd.org, svn-ports-head@freebsd.org Subject: svn commit: r428541 - head/security/vuxml Message-ID: <201612140245.uBE2jsBF066495@repo.freebsd.org>
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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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