XenSource Xen 4.3/4.4/4.5/4.6 Qemu VGA Module integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

A vulnerability, which was classified as critical, was found in XenSource Xen 4.3/4.4/4.5/4.6 (Virtualization Software). Affected is an unknown part of the component Qemu VGA Module. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Integer overflow in the VGA module in QEMU allows local guest OS users to cause a denial of service (out-of-bounds read and QEMU process crash) by editing VGA registers in VBE mode.

The weakness was disclosed 05/09/2016 by Alibaba as XSA-179 as confirmed security advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability is traded as CVE-2016-3712 since 03/30/2016. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 91352 (Citrix XenServer Multiple Vulnerabilities (CTX212736)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196471 (Ubuntu Security Notification for Qemu, Qemu-kvm Vulnerabilities (USN-2974-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (113039) and Tenable (91352). The entry 87131 is 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: 7.7
VulDB Meta Temp Score: 7.0

VulDB Base Score: 9.8
VulDB Temp Score: 8.5
VulDB Vector: 🔍
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NVD Base Score: 5.5
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CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Proof-of-Concept
Download: 🔍

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Nessus ID: 91352
Nessus Name: Citrix XenServer Multiple Vulnerabilities (CTX212736)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 862701
OpenVAS Name: Ubuntu Update for qemu USN-2974-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
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Timelineinfo

03/30/2016 🔍
05/09/2016 +40 days 🔍
05/09/2016 +0 days 🔍
05/09/2016 +0 days 🔍
05/10/2016 +1 days 🔍
05/11/2016 +1 days 🔍
05/27/2016 +16 days 🔍
08/18/2022 +2274 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: XSA-179
Researcher: Alibaba
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-3712 (🔍)
OVAL: 🔍

X-Force: 113039 - Xen Qemu VGA module denial of service
SecurityTracker: 1035794
SecurityFocus: 90314 - QEMU VGA Module CVE-2016-3712 Multiple Denial of Service Vulnerabilities

See also: 🔍

Entryinfo

Created: 05/10/2016 10:39
Updated: 08/18/2022 07:23
Changes: 05/10/2016 10:39 (72), 11/23/2018 10:46 (12), 08/18/2022 07:17 (4), 08/18/2022 07:23 (1)
Complete: 🔍
Cache ID: 3:F82:103

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