Citrix Xen 3.4.0/4.0.0/4.1.0 denial of service

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Citrix Xen 3.4.0/4.0.0/4.1.0. Affected by this vulnerability is an unknown functionality. The manipulation leads to denial of service. This vulnerability is referenced as CVE-2012-0218. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Citrix Xen 3.4.0/4.0.0/4.1.0 (Connectivity Software). This issue affects an unknown code. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service (guest crash) by later triggering an exception that would normally be handled within Xen.

The weakness was published 06/12/2012 as Xen Security Advisory 8 as confirmed advisory (Website). It is possible to read the advisory at lists.xen.org. The identification of this vulnerability is CVE-2012-0218 since 12/14/2011. Attacking locally is a requirement. A simple authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 59779 (Debian DSA-2501-1 : xen - several vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370050 (Citrix XenServer Security Update (CTX133161)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at support.citrix.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (76227), Tenable (59779), SecurityFocus (BID 53955†), OSVDB (82934†) and Secunia (SA49381†). Similar entries are available at VDB-5523, VDB-5525, VDB-5554 and VDB-5556. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

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

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 59779
Nessus Name: Debian DSA-2501-1 : xen - several vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 71479
OpenVAS Name: Debian Security Advisory DSA 2501-1 (xen)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: support.citrix.com

Timelineinfo

12/14/2011 🔍
06/12/2012 +181 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/13/2012 +1 days 🔍
06/20/2012 +7 days 🔍
11/15/2012 +148 days 🔍
12/03/2012 +18 days 🔍
03/25/2021 +3034 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: Xen Security Advisory 8
Status: Confirmed

CVE: CVE-2012-0218 (🔍)
GCVE (CVE): GCVE-0-2012-0218
GCVE (VulDB): GCVE-100-5555

OVAL: 🔍

X-Force: 76227
SecurityFocus: 53955 - Xen 'syscall/sysenter' Instruction Local Denial of Service Vulnerability
Secunia: 49381 - Xen Privilege Escalation and Denial of Service Vulnerabilities, Less Critical
OSVDB: 82934
SecurityTracker: 1027167 - Xen Syscall Exception Handling Error Lets Local Guest Users Deny Service
Vulnerability Center: 37254 - Citrix XenServer and XenSource Xen Local Denial of Service - CVE-2012-0218, Low

See also: 🔍

Entryinfo

Created: 06/20/2012 11:24
Updated: 03/25/2021 16:21
Changes: 06/20/2012 11:24 (79), 04/21/2017 11:35 (5), 03/25/2021 16:21 (3)
Complete: 🔍
Cache ID: 216:672:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Are you interested in using VulDB?

Download the whitepaper to learn more about our service!