Bug 950097 – CVE-2013-1920 kernel: xen: potential use of freed memory in event channel operations

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Bug 950097 - (CVE-2013-1920) CVE-2013-1920 kernel: xen: potential use of freed memory in event channel operations

Summary:	CVE-2013-1920 kernel: xen: potential use of freed memory in event channel ope...

Status:	CLOSED NOTABUG

Aliases:	CVE-2013-1920

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	high Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=important,public=20130404,repo...
Keywords:	Security

Depends On:
Blocks:	950673
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Reported:	2013-04-09 11:37 EDT by Petr Matousek
Modified:	2015-02-16 10:52 EST (History)
CC List:	16 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2013-04-09 11:38:19 EDT
Type:	---
Regression:	---
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Documentation:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2013-04-09 11:37:25 EDT

Wrong ordering of operations upon extending the per-domain event channel tracking table can cause a pointer to freed memory to be left in place, when the hypervisor is under memory pressure and XSM (Xen Security Module) is enabled.

Malicious guest kernels could inject arbitrary events or corrupt other hypervisor state, possibly leading to code execution.

References:
http://seclists.org/oss-sec/2013/q2/17

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 1 Petr Matousek 2013-04-09 11:38:19 EDT

Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.

Comment 3 Michael Young 2013-04-16 17:10:34 EDT

Fedora isn't vulnerable as we don't build xen with XSM enabled. However the source for xen-4.2.1-10.fc19, xen-4.2.1-10.fc18 and xen-4.1.4-7.fc17 include the patch.

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