Microsoft .NET Framework up to 4.5 Web Proxy Setting Auto-Discovery input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.1$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Microsoft .NET Framework 2.0 SP2/3.5/3.5.1/4/4.5. Affected is an unknown function of the component Web Proxy Setting Auto-Discovery Handler. The manipulation leads to input validation. This vulnerability is traded as CVE-2012-4776. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Microsoft .NET Framework 2.0 SP2/3.5/3.5.1/4/4.5 (Programming Language Software). It has been rated as critical. This issue affects some unknown processing of the component Web Proxy Setting Auto-Discovery Handler. 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:

The Web Proxy Auto-Discovery (WPAD) functionality in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not validate configuration data that is returned during acquisition of proxy settings, which allows remote attackers to execute arbitrary JavaScript code by providing crafted data during execution of (1) an XAML browser application (aka XBAP) or (2) a .NET Framework application, aka "Web Proxy Auto-Discovery Vulnerability."

The weakness was shared 11/13/2012 by James Forshaw with Context Information Security as MS12-074 as confirmed bulletin (Website). The advisory is shared at technet.microsoft.com. The vendor cooperated in the coordination of the public release. The identification of this vulnerability is CVE-2012-4776 since 09/06/2012. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a private exploit is available.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 62906 (MS12-074: Vulnerabilities in .NET Framework Could Allow Remote Code Execution (2745030)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90841 (Microsoft .NET Framework Remote Code Execution Vulnerability (MS12-074)).

Applying the patch KB2745030 is able to eliminate this problem. The bugfix is ready for download at technet.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 12792.

The vulnerability is also documented in the databases at Tenable (62906), SecurityFocus (BID 56463†), OSVDB (87266†), Secunia (SA51236†) and SecurityTracker (ID 1027753†). The entries VDB-6926, VDB-6927, VDB-6928 and VDB-6930 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.1

VulDB Base Score: 9.0
VulDB Temp Score: 8.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 62906
Nessus Name: MS12-074: Vulnerabilities in .NET Framework Could Allow Remote Code Execution (2745030)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 902934
OpenVAS Name: Microsoft .NET Framework Remote Code Execution Vulnerability (2745030)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: KB2745030
TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

09/06/2012 🔍
11/08/2012 +63 days 🔍
11/13/2012 +5 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/13/2012 +0 days 🔍
11/14/2012 +1 days 🔍
11/15/2012 +1 days 🔍
04/19/2021 +3077 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS12-074
Researcher: James Forshaw
Organization: Context Information Security
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2012-4776 (🔍)
GCVE (CVE): GCVE-0-2012-4776
GCVE (VulDB): GCVE-100-6929

OVAL: 🔍
IAVM: 🔍

SecurityFocus: 56463 - Microsoft .NET Framework CVE-2012-4776 Remote Code Execution Vulnerability
Secunia: 51236 - Microsoft .NET Framework Multiple Vulnerabilities, Highly Critical
OSVDB: 87266
SecurityTracker: 1027753 - Microsoft .NET Flaws Let Remote Users Execute Arbitrary Code, Obtain Potentially Sensitive Information, and Bypass Security Restrictions
Vulnerability Center: 37239 - [MS12-074] Microsoft .NET Framework WPAD Functionality Allows Remote JavaScript Code Execution, High

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 11/15/2012 10:37
Updated: 04/19/2021 10:42
Changes: 11/15/2012 10:37 (88), 04/05/2017 16:15 (12), 04/19/2021 10:42 (3)
Complete: 🔍
Committer:
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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