Bug 851202 (CVE-2012-3516)

Summary:	CVE-2012-3516 kernel: xen: grant table entry swaps have inadequate bounds checking
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	bressers, drjones, imammedo, lersek, pbonzini, security-response-team, tburke
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:	2015-08-24 16:05:26 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	854595
Bug Blocks:	851204

Description Petr Matousek 2012-08-23 13:37:46 UTC

The grant table hypercall's GNTTABOP_swap_grant_ref sub-operation does not perform adequate checks on the input grant references.

A malicious guest kernel or administrator can crash the host.

It may be possible for an attacker to swap a valid grant reference, which they control, with an invalid one allowing them to write abitrary values to hypervisor memory. This could potentially lead to a
privilege escalation.

Acknowledgements:

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

Comment 3 Petr Matousek 2012-08-23 13:40:48 UTC

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 4 Petr Matousek 2012-09-05 11:56:37 UTC

Now public via:

http://seclists.org/oss-sec/2012/q3/382

Comment 5 Petr Matousek 2012-09-05 12:05:06 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 854595]