Citrix Xen up to 4.2.0 VCPU Deadline Infinite Loop resource management

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Citrix Xen up to 4.2.0. Affected is an unknown function of the component VCPU Deadline Handler. Executing a manipulation as part of Infinite Loop can lead to resource management. This vulnerability is registered as CVE-2012-4535. No exploit is available. It is recommended to use an alternative to replace the affected component.

Detailsinfo

A vulnerability classified as critical was found in Citrix Xen up to 4.2.0 (Connectivity Software). This vulnerability affects an unknown part of the component VCPU Deadline Handler. The manipulation as part of a Infinite Loop leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. CVE summarizes:

Xen 3.4 through 4.2, and possibly earlier versions, allows local guest OS administrators to cause a denial of service (Xen infinite loop and physical CPU consumption) by setting a VCPU with an "inappropriate deadline."

The bug was discovered 11/13/2012. The weakness was published 11/13/2012 as confirmed advisory (Website). The advisory is shared for download at lists.xen.org. This vulnerability was named CVE-2012-4535 since 08/21/2012. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 74852 (openSUSE Security Update : xen (openSUSE-SU-2012:1685-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370051 (Citrix XenServer Security Update (CTX135458)).

The problem might be mitigated by replacing the product with VMware as an alternative. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (80022), Tenable (74852), SecurityFocus (BID 56498†), OSVDB (87298†) and Secunia (SA51214†). Similar entries are available at VDB-6939, VDB-6947, VDB-6948 and VDB-6949. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
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: 74852
Nessus Name: openSUSE Security Update : xen (openSUSE-SU-2012:1685-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892582
OpenVAS Name: Debian Security Advisory DSA 2582-1 (xen - several vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Alternative
Status: 🔍

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

Alternative: VMware

Timelineinfo

08/21/2012 🔍
11/13/2012 +84 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/14/2012 +1 days 🔍
11/14/2012 +0 days 🔍
11/14/2012 +0 days 🔍
11/16/2012 +2 days 🔍
11/21/2012 +5 days 🔍
11/28/2012 +7 days 🔍
06/13/2014 +562 days 🔍
04/19/2021 +2502 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: lists.xen.org
Status: Confirmed

CVE: CVE-2012-4535 (🔍)
GCVE (CVE): GCVE-0-2012-4535
GCVE (VulDB): GCVE-100-6940

OVAL: 🔍

X-Force: 80022
SecurityFocus: 56498 - Xen Multiple Denial of Service Vulnerabilities
Secunia: 51214 - Citrix XenServer Multiple Denial of Service Vulnerabilities, Not Critical
OSVDB: 87298
SecurityTracker: 1027759 - Xen Timer Overflow Lets Local Guest Administrative Users Deny Service on the Host System
Vulnerability Center: 37447 - XenSource and Citrix XenServer Local Guest Administrators Denial of Service - CVE-2012-4535, Low

See also: 🔍

Entryinfo

Created: 11/16/2012 10:20
Updated: 04/19/2021 11:30
Changes: 11/16/2012 10:20 (81), 04/22/2017 09:08 (9), 04/19/2021 11:30 (3)
Complete: 🔍
Committer:
Cache ID: 216:D16:103

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