Citrix Xen 4.0.0/4.1.0/4.2.0/6.0.2 XENMEM_populate_physmap MEMF_populate_on_demand config

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4.8$0-$5k0.00

A vulnerability classified as problematic was found in Citrix Xen 4.0.0/4.1.0/4.2.0/6.0.2 (Connectivity Software). This vulnerability affects the function XENMEM_populate_physmap. The manipulation of the argument MEMF_populate_on_demand 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. CVE summarizes:

XENMEM_populate_physmap in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when translating paging mode is not used, allows local PV OS guest kernels to cause a denial of service (BUG triggered and host crash) via invalid flags such as MEMF_populate_on_demand.

The weakness was disclosed 09/05/2012 by Matthew Daley as 2012-09/msg00002 as confirmed posting (Maillist). The advisory is shared for download at lists.xen.org. The public release has been coordinated in cooperation with the vendor. This vulnerability was named CVE-2012-3496 since 06/14/2012. The exploitation appears to be easy. The attack needs to be approached locally. The successful exploitation needs a single authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.004.

The vulnerability scanner Nessus provides a plugin with the ID 62015 (Debian DSA-2544-1 : xen - denial of service), 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 370049 (Citrix XenServer Security Update (CTX134708)).

Applying the patch xsa14 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 (78267) and Tenable (62015). The entries 5876, 5927, 6105 and 6107 are pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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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: Config
CWE: CWE-16
ATT&CK: T1592.004

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

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Nessus ID: 62015
Nessus Name: Debian DSA-2544-1 : xen - denial of service
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

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

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: xsa14

Timelineinfo

06/14/2012 🔍
09/05/2012 +83 days 🔍
09/05/2012 +0 days 🔍
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09/05/2012 +0 days 🔍
09/07/2012 +2 days 🔍
09/10/2012 +3 days 🔍
11/15/2012 +66 days 🔍
11/23/2012 +8 days 🔍
04/12/2021 +3062 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: 2012-09/msg00002
Researcher: Matthew Daley
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-3496 (🔍)
OVAL: 🔍

X-Force: 78267 - Xen XENMEM_populate_physmap denial of service, Medium Risk
SecurityTracker: 1027481 - Xen XENMEM_populate_physmap() Input Validation Flaw Lets Local Users on the Guest Operating System Deny Service on the Host
Vulnerability Center: 37245 - Citrix XenServer, Citrix NetScaler SDX and XenSource Xen Local Denial of Service - CVE-2012-3496, Medium
SecurityFocus: 55412 - Xen 'XENMEM_populate_physmap' CVE-2012-3496 Denial of Service Vulnerability
Secunia: 50472 - Xen Multiple Denial of Service and Privilege Escalation Vulnerabilities, Less Critical
OSVDB: 85200

See also: 🔍

Entryinfo

Created: 09/10/2012 12:59
Updated: 04/12/2021 08:31
Changes: 09/10/2012 12:59 (90), 04/21/2017 11:33 (5), 04/12/2021 08:31 (3)
Complete: 🔍
Committer: olku

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