Microsoft ASP.NET padding information disclosure

ms-aspdotnet-padding-info-disclosure (61898) The risk level is classified as MediumMedium Risk

Description:

Microsoft .NET Framework could allow a remote attacker to obtain sensitive information, caused by an error in the ASP.Net encryption implementation when decrypting certain cipher text. An attacker could exploit this vulnerability via a padding oracle attack to decrypt the View State object to manipulate encrypted data or read restricted data files downloaded from the ASP.Net application.

Note: This vulnerability also affects other products.

*CVSS:

Base Score: 9.4
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: None
 
Temporal Score: 7.8
  Exploitability: Functional
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Obtain Information

Remedy:

Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.

References:

  • EKOPARTY 2010: Padding Oracles Everywhere.
  • IBM Internet Security Systems Protection Alert: Microsoft Vulnerability in ASP.NET Could Allow Information Disclosure.
  • Microsoft Security Advisory (2416728): Out of Band Release to Address Microsoft Security Advisory 2416728.
  • Microsoft Security Advisory (2416728): Vulnerability in ASP.NET Could Allow Information Disclosure.
  • Microsoft Security Advisory (2416728): Security Advisory 2416728 - Workaround Update.
  • Microsoft Security Bulletin MS10-070: Vulnerability in ASP.NET Could Allow Information Disclosure (2418042).
  • Microsoft Security Bulletin MS11-078: Vulnerability in .NET Framework and Microsoft Silverlight Could Allow Remote Code Execution (2604930).
  • Microsoft Security Bulletin MS12-035: Vulnerabilities in .NET Framework Could Allow Remote Code Execution (2693777).
  • Mono Web site: ASP.NET Padding Oracle.
  • Mono Web site: Main Page - Mono.
  • Offensive Security Exploit Database [10-06-2010]: ASP.NET Padding Oracle Vulnerability (MS10-070).
  • Offensive Security Exploit Database [10-17-2010]: MS10-070 ASP.NET Padding Oracle File Download.
  • Offensive Security Exploit Database [10-20-2010]: MS10-070 ASP.NET Auto-Decryptor File Download Exploit.
  • BID-43316: Microsoft .NET Framework ASP.NET Padding Oracle Information Disclosure Vulnerability
  • BID-44285: Mono ASP.NET Implementation Padding Oracle Information Disclosure Vulnerability
  • BID-44337: Oracle Mojarra Encrypted View State Oracle Padding Security Vulnerability
  • CVE-2010-2057: shared/util/StateUtils.java in Apache MyFaces 1.1.x before 1.1.8, 1.2.x before 1.2.9, and 2.0.x before 2.0.1 uses an encrypted View State without a Message Authentication Code (MAC), which makes it easier for remote attackers to perform successful modifications of the View State via a padding oracle attack.
  • CVE-2010-3332: Microsoft .NET Framework 1.1 SP1, 2.0 SP1 and SP2, 3.5, 3.5 SP1, 3.5.1, and 4.0, as used for ASP.NET in Microsoft Internet Information Services (IIS), provides detailed error codes during decryption attempts, which allows remote attackers to decrypt and modify encrypted View State (aka __VIEWSTATE) form data, and possibly forge cookies or read application files, via a padding oracle attack, aka ASP.NET Padding Oracle Vulnerability.
  • CVE-2010-4007: Oracle Mojarra uses an encrypted View State without a Message Authentication Code (MAC), which makes it easier for remote attackers to perform successful modifications of the View State via a padding oracle attack, a related issue to CVE-2010-2057.
  • OSVDB ID: 68815: Apache MyFaces shared/util/StateUtils.java View State MAC Weakness Cryptographic Padding Remote View State Modification
  • OSVDB ID: 68816: Oracle Mojarra View State MAC Weakness Cryptographic Padding Remote View State Modification
  • SA41409: Microsoft ASP.NET Cryptographic Padding Information Disclosure
  • SA41919: Mono ASP.NET Cryptographic Padding Oracle Information Disclosure
  • SA41981: Oracle Mojarra Cryptographic Padding Oracle Information Disclosure
  • SA41995: Apache MyFaces Cryptographic Padding Oracle Information Disclosure
  • SECTRACK ID: 1024459: Microsoft ASP.NET Padding Oracle Attack Lets Remote Users Decrypt Data
  • SUSE-SR:2011:008: SUSE Security Summary Report
  • VUPEN/ADV-2010-2429: Microsoft ASP.NET Error Messages Information Disclosure (MS10-070)
  • VUPEN/ADV-2010-2751: Mono ASP.NET Implementation Padding Oracle Information Disclosure

Platforms Affected:

  • Microsoft .NET Framework 1.0 SP3
  • Microsoft .NET Framework 1.1 SP1
  • Microsoft .NET Framework 2.0 SP2
  • Microsoft .NET Framework 3.5
  • Microsoft .NET Framework 3.5 SP1
  • Microsoft .NET Framework 3.5.1
  • Microsoft .NET Framework 4.0
  • Microsoft ASP.NET 1.1 SP1
  • Microsoft ASP.NET 2.0 SP2
  • Microsoft ASP.NET 2.0 SP1
  • Microsoft ASP.NET 3.5
  • Microsoft ASP.NET 3.5 SP1
  • Microsoft ASP.NET 3.5.1
  • Microsoft ASP.NET 4.0
  • Microsoft Windows 7 x64
  • Microsoft Windows 7 x32
  • Microsoft Windows Server 2003 SP2
  • Microsoft Windows Server 2003 SP2 Itanium
  • Microsoft Windows Server 2003 SP2 x64
  • Microsoft Windows Server 2008 R2 x64
  • Microsoft Windows Server 2008 x64
  • Microsoft Windows Server 2008 SP2 x64
  • Microsoft Windows Server 2008 x32
  • Microsoft Windows Server 2008 SP2 x32
  • Microsoft Windows Server 2008 Itanium
  • Microsoft Windows Server 2008 SP2 Itanium
  • Microsoft Windows Server 2008 R2 Itanium
  • Microsoft Windows Vista SP1 x64
  • Microsoft Windows Vista SP1
  • Microsoft Windows Vista SP2
  • Microsoft Windows Vista SP2 x64
  • Microsoft Windows XP SP2 x64 Professional
  • Microsoft Windows XP SP3
  • Mono Mono 1.x
  • Mono Mono 2.x

Reported:

Sep 17, 2010

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