Citrix Xen up to 4.2.0 set_p2m_entry config

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability classified as problematic was found in Citrix Xen up to 4.2.0 (Connectivity Software). Affected by this vulnerability is the function set_p2m_entry. The manipulation with an unknown input leads to a config vulnerability. The CWE definition for the vulnerability is CWE-16. As an impact it is known to affect availability. The summary by CVE is:

Xen 3.4 through 4.2, and possibly earlier versions, does not properly synchronize the p2m and m2p tables when the set_p2m_entry function fails, which allows local HVM guest OS administrators to cause a denial of service (memory consumption and assertion failure), aka "Memory mapping failure DoS vulnerability."

The weakness was shared 11/13/2012 as msg00005 as confirmed posting (Website). The advisory is shared at The vendor cooperated in the coordination of the public release. This vulnerability is known as CVE-2012-4537 since 08/21/2012. An attack has to be approached locally. The requirement for exploitation is a single authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592.004 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 63171 (CentOS 5 : kernel (CESA-2012:1540)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370051 (Citrix XenServer Security Update (CTX135458)).

Applying the patch xsa22-VERSION is able to eliminate this problem. The bugfix is ready for download at A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (80024) and Tenable (63171).







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.5
VulDB Temp Score: 4.8
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Class: Config

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

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Nessus ID: 63171
Nessus Name: CentOS 5 : kernel (CESA-2012:1540)
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OpenVAS ID: 892582
OpenVAS Name: Debian Security Advisory DSA 2582-1 (xen - several vulnerabilities
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Recommended: Patch
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Patch: xsa22-VERSION


08/21/2012 🔍
11/13/2012 +84 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 🔍
04/19/2021 +3064 days 🔍



Advisory: msg00005
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2012-4537 (🔍)

X-Force: 80024 - Xen set_p2m_entry() denial of service, Medium Risk
SecurityTracker: 1027761 - Xen Memory Mapping Bug Lets Local Guest Administrative Users Deny Service
Vulnerability Center: 37448 - XenSource and Citrix XenServer Local Guest Administrators Denial of Service - CVE-2012-4537, Low
SecurityFocus: 56498 - Xen Multiple Denial of Service Vulnerabilities
Secunia: 51200 - Xen Multiple Denial of Service Vulnerabilities, Not Critical
OSVDB: 87307


Created: 11/16/2012 12:13 PM
Updated: 04/19/2021 12:11 PM
Changes: 11/16/2012 12:13 PM (86), 04/22/2017 09:09 AM (6), 04/19/2021 12:11 PM (3)
Complete: 🔍
Committer: olku
Cache ID: 3:6DE:40


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