Citrix XenServer 5.0/5.6/6.0/6.0.2 Qemu Emulator input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in Citrix XenServer 5.0/5.6/6.0/6.0.2 and classified as problematic. This affects an unknown part of the component Qemu Emulator. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2012-3515. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Citrix XenServer 5.0/5.6/6.0/6.0.2 (Virtualization Software) and classified as critical. This issue affects an unknown part of the component Qemu Emulator. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Qemu, as used in Xen 4.0, 4.1 and possibly other products, when emulating certain devices with a virtual console backend, allows local OS guest users to gain privileges via a crafted escape VT100 sequence that triggers the overwrite of a "device model s address space."

The weakness was disclosed 09/05/2012 as 2012-09/msg00003 as not defined posting (Maillist). It is possible to read the advisory at lists.xen.org. The public release has been coordinated in cooperation with Citrix. The identification of this vulnerability is CVE-2012-3515 since 06/14/2012. The exploitation is known to be difficult. Attacking locally is a requirement. A simple authentication is necessary for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 68613 (Oracle Linux 5 : kvm (ELSA-2012-1235)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370049 (Citrix XenServer Security Update (CTX134708)).

Applying the patch xsa17 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 (78270), Tenable (68613), SecurityFocus (BID 55413†), OSVDB (85196†) and Secunia (SA50461†). The entries VDB-5876, VDB-5927, VDB-6105 and VDB-6108 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
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: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 68613
Nessus Name: Oracle Linux 5 : kvm (ELSA-2012-1235)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 72171
OpenVAS Name: Debian Security Advisory DSA 2542-1 (qemu-kvm)
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: xsa17

Timelineinfo

06/14/2012 🔍
09/05/2012 +82 days 🔍
09/05/2012 +0 days 🔍
09/05/2012 +0 days 🔍
09/06/2012 +0 days 🔍
09/10/2012 +4 days 🔍
11/23/2012 +74 days 🔍
07/12/2013 +230 days 🔍
01/04/2016 +907 days 🔍
02/02/2016 +29 days 🔍
07/23/2018 +901 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: 2012-09/msg00003
Status: Not defined
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-3515 (🔍)
GCVE (CVE): GCVE-0-2012-3515
GCVE (VulDB): GCVE-100-6107

OVAL: 🔍

X-Force: 78270
SecurityFocus: 55413 - Xen CVE-2012-3515 Local Privilege Escalation Vulnerability
Secunia: 50461 - Qemu Console VT1000 Sequence Handling Privilege Escalation Vulnerability, Less Critical
OSVDB: 85196
Vulnerability Center: 56349 - Xen 4.2 and Earlier Improper \x27VT100\x27 Sequences Escaping Handling Allows Local Privilege Escalation, Medium

See also: 🔍

Entryinfo

Created: 09/10/2012 10:30
Updated: 07/23/2018 07:45
Changes: 09/10/2012 10:30 (77), 07/23/2018 07:45 (11)
Complete: 🔍
Committer: olku
Cache ID: 216:ED2:103

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