svn commit: r428976 - head/security/vuxml
Jason Unovitch
junovitch at FreeBSD.org
Tue Dec 20 03:13:21 UTC 2016
Author: junovitch
Date: Tue Dec 20 03:13:20 2016
New Revision: 428976
URL: https://svnweb.freebsd.org/changeset/ports/428976
Log:
Document Xen Security Advisory (XSA 204)
Reported by: royger
Security: CVE-2016-10013
Security: https://vuxml.FreeBSD.org/freebsd/942433db-c661-11e6-ae1b-002590263bf5.html
Modified:
head/security/vuxml/vuln.xml
Modified: head/security/vuxml/vuln.xml
==============================================================================
--- head/security/vuxml/vuln.xml Tue Dec 20 02:30:58 2016 (r428975)
+++ head/security/vuxml/vuln.xml Tue Dec 20 03:13:20 2016 (r428976)
@@ -58,6 +58,40 @@ Notes:
* Do not forget port variants (linux-f10-libxml2, libxml2, etc.)
-->
<vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+ <vuln vid="942433db-c661-11e6-ae1b-002590263bf5">
+ <topic>xen-kernel -- x86: Mishandling of SYSCALL singlestep during emulation</topic>
+ <affects>
+ <package>
+ <name>xen-kernel</name>
+ <range><lt>4.7.1_2</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-204.html">
+ <p>The typical behaviour of singlestepping exceptions is determined at
+ the start of the instruction, with a #DB trap being raised at the
+ end of the instruction. SYSCALL (and SYSRET, although we don't
+ implement it) behave differently because the typical behaviour
+ allows userspace to escalate its privilege. (This difference in
+ behaviour seems to be undocumented.) Xen wrongly raised the
+ exception based on the flags at the start of the instruction.</p>
+ <p>Guest userspace which can invoke the instruction emulator can use
+ this flaw to escalate its privilege to that of the guest kernel.</p>
+ </blockquote>
+ </body>
+ </description>
+ <references>
+ <cvename>CVE-2016-10013</cvename>
+ <url>http://xenbits.xen.org/xsa/advisory-204.html</url>
+ </references>
+ <dates>
+ <discovery>2016-12-19</discovery>
+ <entry>2016-12-20</entry>
+ </dates>
+ </vuln>
+
<vuln vid="e47ab5db-c333-11e6-ae1b-002590263bf5">
<topic>atheme-services -- multiple vulnerabilities</topic>
<affects>
More information about the svn-ports-head
mailing list