Citrix Xen up to 6.0.2 PHYSDEVOP_get_free_pirq input validation

CVSS Meta Temp Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Citrix Xen up to 6.0.2. Affected is the function PHYSDEVOP_get_free_pirq. This manipulation causes input validation. This vulnerability is registered as CVE-2012-3495. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability has been found in Citrix Xen up to 6.0.2 (Connectivity Software) and classified as problematic. Affected by this vulnerability is the function PHYSDEVOP_get_free_pirq. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.

The weakness was published 09/05/2012 by Matthew Daley as 2012-09/msg00001 as confirmed posting (Maillist). It is possible to read the advisory at lists.xen.org. The public release has been coordinated with Citrix. This vulnerability is known as CVE-2012-3495 since 06/14/2012. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 62155 (Fedora 16 : xen-4.1.3-2.fc16 (2012-13443)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370049 (Citrix XenServer Security Update (CTX134708)).

Applying the patch xsa13 is able to eliminate this problem. The bugfix is ready for download at lists.xen.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (62155), SecurityFocus (BID 55406†), OSVDB (85202†), Secunia (SA50472†) and SecurityTracker (ID 1027480†). Similar entries are available at VDB-5876, VDB-5927, VDB-6105 and VDB-6107. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.2
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 62155
Nessus Name: Fedora 16 : xen-4.1.3-2.fc16 (2012-13443)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 864722
OpenVAS Name: Fedora Update for xen FEDORA-2012-13434
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: xsa13

Timelineinfo

06/14/2012 🔍
09/05/2012 +83 days 🔍
09/05/2012 +0 days 🔍
09/05/2012 +0 days 🔍
09/05/2012 +0 days 🔍
09/05/2012 +0 days 🔍
09/07/2012 +2 days 🔍
09/10/2012 +3 days 🔍
09/18/2012 +8 days 🔍
11/23/2012 +66 days 🔍
04/29/2018 +1983 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: 2012-09/msg00001
Researcher: Matthew Daley
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-3495 (🔍)
GCVE (CVE): GCVE-0-2012-3495
GCVE (VulDB): GCVE-100-6115
SecurityFocus: 55406 - Xen 'physdev_get_free_pirq' CVE-2012-3495 Denial of Service Vulnerability
Secunia: 50472 - Xen Multiple Denial of Service and Privilege Escalation Vulnerabilities, Less Critical
OSVDB: 85202
SecurityTracker: 1027480

See also: 🔍

Entryinfo

Created: 09/10/2012 14:22
Updated: 04/29/2018 10:34
Changes: 09/10/2012 14:22 (78), 04/29/2018 10:34 (7)
Complete: 🔍
Committer: olku
Cache ID: 216::103

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