Qualys Vulnerability R&D Lab has released new vulnerability checks in the Enterprise TruRisk Platform to protect organizations against 1 vulnerability that were fixed in 2 bulletins announced today by Microsoft. Customers can immediately audit their networks for these and other new vulnerabilities by accessing their Qualys subscription. Visit Qualys Security Blog to prioritize remediation.
Non-Qualys customers can audit their network for these and other vulnerabilities by signing up for a Qualys Free Trial, or by trying Qualys Community Edition.
Microsoft has released 2 security bulletins to fix newly discovered flaws in their software. Qualys has released the following checks for these new vulnerabilities:
A vulnerability exists in ASP.NET because the application provides Web clients details in error messages when decrypting certain ciphertext. This is known as a "padding oracle" attack.
An attacker exploiting this vulnerability could view data, such as the View State, which was encrypted by the target server, or read data from files on the target server, such as web.config. This would allow the attacker to tamper with the contents of the data. By sending back the altered contents to an affected server, the attacker could observe the error codes returned by the server.
Microsoft has released a security update (MS10-070) that addresses the vulnerability by additionally signing all data that is encrypted by ASP.NET.
The update also addresses the vulnerability first described in Microsoft Security Advisory 2416728.
Windows Embedded Systems:- For additional information regarding security updates for embedded systems, refer to the following MSDN blog(s):
October Security Updates for XPe and Standard 2009 Are Now Available on the ECE Site (KB2418042, 2416472, 2416473, 2418240)
August Security Updates for XPe SP3 and Standard 2009 Are Now on ECE (KB2418241)
Windows XP Service Pack 3 (Microsoft .NET Framework 1.1 Service Pack 1)
Windows XP Service Pack 3 (Microsoft .NET Framework 2.0 Service Pack 2)
Windows XP Service Pack 3 (Microsoft .NET Framework 3.5)
Windows XP Service Pack 3 (Microsoft .NET Framework 3.5 Service Pack 1)
Windows XP Service Pack 3 (Microsoft .NET Framework 4.0)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 1.1 Service Pack 1)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 2.0 Service Pack 2)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 3.5)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 3.5 Service Pack 1)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 4.0)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 1.1 Service Pack 1)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 2.0 Service Pack 2)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 3.5)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 3.5 Service Pack 1)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 4.0)
Windows Server 2003 x64 Edition Service Pack 2 (Microsoft .NET Framework 1.1 Service Pack 1)
For a complete list of patch download links, please refer to Microsoft Security Bulletin MS10-070.
Workaround:
Enable ASP.NET custom errors and map all error codes to the same error page.
Impact of the workaround: If an error occurs during a web transaction, the web clients will see the same generic error message on the server, regardless of what error actually occurs.
Refer to the advisory to obtain additional details on applying the workaround.
A vulnerability exists in ASP.NET because the application provides Web clients details in error messages when decrypting certain ciphertext. This is known as a "padding oracle" attack.
An attacker exploiting this vulnerability could view data, such as the View State, which was encrypted by the target server, or read data from files on the target server, such as web.config. This would allow the attacker to tamper with the contents of the data. By sending back the altered contents to an affected server, the attacker could observe the error codes returned by the server.
Microsoft has released a security update (MS10-070) that addresses the vulnerability by additionally signing all data that is encrypted by ASP.NET.
The update also addresses the vulnerability first described in Microsoft Security Advisory 2416728.
NOTE: Microsoft IIS is running on the target.
Windows Embedded Systems:- For additional information regarding security updates for embedded systems, refer to the following MSDN blog(s):
October Security Updates for XPe and Standard 2009 Are Now Available on the ECE Site (KB2418042, 2416472, 2416473, 2418240)
August Security Updates for XPe SP3 and Standard 2009 Are Now on ECE (KB2418241)
Windows XP Service Pack 3 (Microsoft .NET Framework 1.1 Service Pack 1)
Windows XP Service Pack 3 (Microsoft .NET Framework 2.0 Service Pack 2)
Windows XP Service Pack 3 (Microsoft .NET Framework 3.5)
Windows XP Service Pack 3 (Microsoft .NET Framework 3.5 Service Pack 1)
Windows XP Service Pack 3 (Microsoft .NET Framework 4.0)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 1.1 Service Pack 1)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 2.0 Service Pack 2)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 3.5)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 3.5 Service Pack 1)
Windows XP Professional x64 Edition Service Pack 2 (Microsoft .NET Framework 4.0)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 1.1 Service Pack 1)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 2.0 Service Pack 2)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 3.5)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 3.5 Service Pack 1)
Windows Server 2003 Service Pack 2 (Microsoft .NET Framework 4.0)
Windows Server 2003 x64 Edition Service Pack 2 (Microsoft .NET Framework 1.1 Service Pack 1)
For a complete list of patch download links, please refer to Microsoft Security Bulletin MS10-070.
Workaround:
Enable ASP.NET custom errors and map all error codes to the same error page.
Impact of the workaround: If an error occurs during a web transaction, the web clients will see the same generic error message on the server, regardless of what error actually occurs.
Refer to the advisory to obtain additional details on applying the workaround.
These new vulnerability checks are included in Qualys vulnerability signature 1.27.57-3. Each Qualys account is automatically updated with the latest vulnerability signatures as they become available. To view the vulnerability signature version in your account, from the Qualys Help menu, select the About tab.
To perform a selective vulnerability scan, configure a scan profile to use the following options:
In addition, prior to running a scan for these new vulnerabilities, you can estimate your exposure to these new threats by running the Risk Analysis Report, available from the Qualys Vulnerability Management Reports tab.
Platforms and Platform Identification
For more information, customers may contact Qualys Technical Support.
The Enterprise TruRisk Platform and its integrated suite of security and compliance applications provides organizations of all sizes with a global view of their security and compliance solutions, while drastically reducing their total cost of ownership. Qualys solutions include: continuous monitoring, vulnerability management, policy compliance, PCI compliance, security assessment questionnaire, web application scanning, web application firewall, malware detection and SECURE Seal for security testing of web sites.