Citrix Xen 4.0.0/4.1.0/4.2.0 Pagetable HVMOP_pagetable_dying input validation

CVSS Meta Temp Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Citrix Xen 4.0.0/4.1.0/4.2.0 and classified as problematic. The impacted element is the function HVMOP_pagetable_dying of the component Pagetable Handler. The manipulation results in input validation. This vulnerability was named CVE-2012-4538. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability classified as problematic has been found in Citrix Xen 4.0.0/4.1.0/4.2.0 (Connectivity Software). Affected is the function HVMOP_pagetable_dying of the component Pagetable Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

The HVMOP_pagetable_dying hypercall in Xen 4.0, 4.1, and 4.2 does not properly check the pagetable state when running on shadow pagetables, which allows a local HVM guest OS to cause a denial of service (hypervisor crash) via unspecified vectors.

The weakness was presented 11/13/2012 as msg00004 as confirmed posting (Website). 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-2012-4538 since 08/21/2012. The attack needs to be approached locally. A authentication is needed for exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 63188 (Debian DSA-2582-1 : 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 370051 (Citrix XenServer Security Update (CTX135458)).

Applying the patch xsa23-x 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 (80025), Tenable (63188), SecurityFocus (BID 56498†), OSVDB (87306†) and Secunia (SA51200†). See VDB-6939, VDB-6940, VDB-6947 and VDB-6949 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: 4.8

VulDB Base Score: 5.5
VulDB Temp Score: 4.8
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: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 63188
Nessus Name: Debian DSA-2582-1 : xen - several vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

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: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: xsa23-x

Timelineinfo

08/21/2012 🔍
11/13/2012 +84 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/14/2012 +1 days 🔍
11/14/2012 +0 days 🔍
11/14/2012 +0 days 🔍
11/16/2012 +2 days 🔍
11/24/2012 +8 days 🔍
11/28/2012 +4 days 🔍
04/19/2021 +3064 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: msg00004
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2012-4538 (🔍)
GCVE (CVE): GCVE-0-2012-4538
GCVE (VulDB): GCVE-100-6948

OVAL: 🔍

X-Force: 80025 - Xen HVMOP_pagetable_dying() denial of service, Medium Risk
SecurityFocus: 56498 - Xen Multiple Denial of Service Vulnerabilities
Secunia: 51200 - Xen Multiple Denial of Service Vulnerabilities, Not Critical
OSVDB: 87306
SecurityTracker: 1027762 - Xen HVMOP_pagetable_dying() Bug Lets Local Users Deny Service
Vulnerability Center: 37450 - XenSource and Citrix XenServer Local HVM Guest Denial of Service - CVE-2012-4538, Low

See also: 🔍

Entryinfo

Created: 11/16/2012 12:10
Updated: 04/19/2021 12:09
Changes: 11/16/2012 12:10 (92), 04/22/2017 09:09 (1), 04/19/2021 12:09 (3)
Complete: 🔍
Committer: olku
Cache ID: 216:DDC:103

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