Bug 870412 (CVE-2012-4544)

Summary:	CVE-2012-4544 xen: Xen domain builder Out-of-memory due to malicious kernel/ramdisk
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	drjones, imammedo, jforbes, jrusnack, kraxel, leiwang, lersek, m.a.young, mrezanin, pbonzini, tburke, virt-maint, wshi, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-08-24 13:56:45 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	870413, 870414, 876997
Bug Blocks:	870415, 903143

Description Petr Matousek 2012-10-26 12:25:42 UTC

The Xen PV domain builder contained no validation of the size of the supplied kernel or ramdisk either before or after decompression. This could cause the toolstack to consume all available RAM in the domain running the domain builder.

A malicious guest administrator who can supply a kernel or ramdisk can exhaust memory in domain 0 leading to a denial of service attack.

HVM guests are not affected by this vulnerability.

Reference:
http://lists.xen.org/archives/html/xen-devel/2012-10/msg02015.html
http://www.openwall.com/lists/oss-security/2012/10/26/3

Acknowledgements:

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

Comment 2 Petr Matousek 2012-10-26 12:28:55 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 870414]

Comment 6 errata-xmlrpc 2013-02-07 18:54:25 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0241 https://rhn.redhat.com/errata/RHSA-2013-0241.html