Microsoft .NET Framework 1.1 SP1/2.0 SP2/3.5 SP1/3.5.1/4.0 Username Parser access control

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Microsoft .NET Framework 1.1 SP1/2.0 SP2/3.5 SP1/3.5.1/4.0. This impacts an unknown function of the component Username Parser. Such manipulation leads to access control. This vulnerability is listed as CVE-2011-3416. The attack may be performed from remote. In addition, an exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Microsoft .NET Framework 1.1 SP1/2.0 SP2/3.5 SP1/3.5.1/4.0 (Programming Language Software). It has been rated as critical. Affected by this issue is an unknown function of the component Username Parser. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The Forms Authentication feature in the ASP.NET subsystem in Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 allows remote authenticated users to obtain access to arbitrary user accounts via a crafted username, aka "ASP.Net Forms Authentication Bypass Vulnerability."

The bug was discovered 10/02/2011. The weakness was presented 12/29/2011 by Alexander Klink as MS11-100 as confirmed bulletin (Technet). The advisory is shared for download at technet.microsoft.com. The public release was coordinated in cooperation with the vendor. This vulnerability is handled as CVE-2011-3416 since 09/09/2011. The attack may be launched remotely. The successful exploitation requires a simple authentication. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

After 4 months, there has been an exploit disclosed. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 88 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 57414 (MS11-100: Vulnerabilities in .NET Framework Could Allow Elevation of Privilege (2638420)), 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 90764 (Microsoft ASP.NET Denial of Service Vulnerability (KB2659883 and MS11-100)).

Applying the patch MS11-100 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 12924.

The vulnerability is also documented in the databases at X-Force (72027), Tenable (57414), SecurityFocus (BID 51201†), OSVDB (78055†) and Secunia (SA47323†). See VDB-4510, VDB-4506, VDB-4509 and VDB-4507 for similar entries. Once again VulDB remains the best source for vulnerability data.

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CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 7.9

VulDB Base Score: 8.8
VulDB Temp Score: 7.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 57414
Nessus Name: MS11-100: Vulnerabilities in .NET Framework Could Allow Elevation of Privilege (2638420)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 902806
OpenVAS Name: Vulnerabilities in .NET Framework Could Allow Elevation of Privilege (2638420)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: MS11-100
Suricata ID: 2014100
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TippingPoint: 🔍
ISS Proventia IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

09/09/2011 🔍
10/02/2011 +23 days 🔍
12/29/2011 +87 days 🔍
12/29/2011 +0 days 🔍
12/29/2011 +0 days 🔍
12/29/2011 +0 days 🔍
12/29/2011 +0 days 🔍
12/29/2011 +0 days 🔍
12/30/2011 +1 days 🔍
01/01/2012 +1 days 🔍
01/21/2012 +20 days 🔍
03/29/2012 +68 days 🔍
03/20/2021 +3278 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MS11-100
Researcher: Alexander Klink
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2011-3416 (🔍)
GCVE (CVE): GCVE-0-2011-3416
GCVE (VulDB): GCVE-100-4508

OVAL: 🔍
IAVM: 🔍

X-Force: 72027
SecurityFocus: 51201
Secunia: 47323 - Microsoft .NET Framework Multiple Vulnerabilities, Moderately Critical
OSVDB: 78055 - Microsoft .NET Framework ASP.NET Username Parsing Authentication Bypass
Vulnerability Center: 34156 - [MS11-100] Microsoft .NET Framework ASP.NET Forms Authentication Bypass Vulnerability, High

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

Entryinfo

Created: 01/21/2012 01:00
Updated: 03/20/2021 10:57
Changes: 01/21/2012 01:00 (57), 04/05/2017 15:08 (36), 03/20/2021 10:48 (7), 03/20/2021 10:51 (2), 03/20/2021 10:57 (1)
Complete: 🔍
Cache ID: 216:F9C:103

Once again VulDB remains the best source for vulnerability data.

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