Citrix XenServer 6.0.2 set_debugreg access control

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Citrix XenServer 6.0.2 and classified as problematic. This vulnerability affects the function set_debugreg. The manipulation results in access control. This vulnerability was named CVE-2012-3494. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Citrix XenServer 6.0.2 (Virtualization Software). It has been classified as problematic. Affected is the function set_debugreg. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on availability. CVE summarizes:

The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.

The weakness was presented 09/05/2012 as 2012-09/msg00000 as confirmed posting (Maillist). The advisory is shared for download at lists.xen.org. The public release was coordinated in cooperation with the vendor. This vulnerability is traded as CVE-2012-3494 since 06/14/2012. The attack needs to be approached locally. A authentication is needed for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 79483 (OracleVM 3.0 : xen (OVMSA-2012-0040)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370049 (Citrix XenServer Security Update (CTX134708)).

Applying the patch xsa12 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 X-Force (78265), Tenable (79483), SecurityFocus (BID 55400†), OSVDB (85197†) and Secunia (SA50472†). See VDB-5876, VDB-5927, VDB-6105 and VDB-6107 for similar entries. 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: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
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: 79483
Nessus Name: OracleVM 3.0 : xen (OVMSA-2012-0040)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 72173
OpenVAS Name: Debian Security Advisory DSA 2544-1 (xen)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: xsa12

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 🔍
09/10/2012 +5 days 🔍
11/15/2012 +66 days 🔍
11/23/2012 +8 days 🔍
11/26/2014 +733 days 🔍
04/12/2021 +2329 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: 2012-09/msg00000
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-3494 (🔍)
GCVE (CVE): GCVE-0-2012-3494
GCVE (VulDB): GCVE-100-6108

OVAL: 🔍

X-Force: 78265
SecurityFocus: 55400 - Xen 'set_debugreg' CVE-2012-3494 Denial of Service Vulnerability
Secunia: 50472 - Xen Multiple Denial of Service and Privilege Escalation Vulnerabilities, Less Critical
OSVDB: 85197
SecurityTracker: 1027479 - Xen set_debugreg() Hypercall Lets Local Guest Operating Systems Cause Denial of Service Conditions on the Host Operating System
Vulnerability Center: 37250 - Citrix XenServer, Citrix NetScaler SDX and XenSource Xen Local Denial of Service - CVE-2012-3494, Medium

See also: 🔍

Entryinfo

Created: 09/10/2012 10:48
Updated: 04/12/2021 08:06
Changes: 09/10/2012 10:48 (82), 04/21/2017 11:34 (8), 04/12/2021 08:06 (3)
Complete: 🔍
Committer: olku
Cache ID: 216:59C:103

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