Bug 962322 (CVE-2013-2072)

Summary:	CVE-2013-2072 xen: Buffer overflow in xencontrol Python bindings affecting xend
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:	imammedo, lersek, mrezanin, pbonzini, security-response-team
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:	2013-05-13 08:10:30 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:	964241
Bug Blocks:	962327

Description Petr Matousek 2013-05-13 08:07:41 UTC

The Python bindings for the xc_vcpu_setaffinity call do not properly check their inputs. Systems which allow untrusted administrators to configure guest vcpu affinity may be exploited to trigger a buffer
overrun and corrupt memory.

An attacker who is able to configure a specific vcpu affinity via a toolstack which uses the Python bindings is able to exploit this issue.

Exploiting this issue leads to memory corruption which may result in a DoS against the system by crashing the toolstack. The possibility of code execution (privilege escalation) has not been ruled out.

The xend toolstack passes a cpumap to this function without sanitization. xend allows the cpumap to be configured via the guest configuration file or the SXP/XenAPI interface. Normally these interfaces are not considered safe to expose to non-trusted parties. However systems which attempt to allow guest administrator control of VCPU affinity in a safe way via xend may expose this issue.

Acknowledgements:

This issue was discovered by Paolo Bonzini and Laszlo Ersek of Red Hat.

Comment 2 Petr Matousek 2013-05-13 08:10:30 UTC

Statement:

Not vulnerable.

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

Comment 3 Petr Matousek 2013-05-17 15:50:50 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 964241]