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NET Framework installed on your system, see the FAQ entry, "How do I determine which version of the Microsoft . To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. NET Framework 2.0 Service Pack 1 in addition to the updates for . To help determine if there are any additional versions of the . There are two updates listed for the version of the Microsoft . It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. NET Framework 3.5 Service Pack 1(KB2416470)Microsoft . NET Framework 3.5 Service Pack 1(KB2416473)Microsoft . Microsoft revised this security bulletin to announce a detection change to offer the Microsoft . For contact information, visit the Microsoft Worldwide Information Web site, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. Non-Affected Software Why was this bulletin revised on February 22, 2011? Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office.These responses include both the entire HTTP response and the HTTP error code.If any of the above is not true at all times, then this is not sufficient. Administrators of these applications should follow the recommendations outlined in this advisory. The cryptographic vulnerability being presented involves revealing cryptographic padding errors to a client for algorithms that use PKCS #7 padding.The article also documents recommended solutions for these issues. NET Framework 3.5 Service Pack 1(KB2418241)Microsoft . NET due to improper error handling during encryption padding verification.

NET Framework is installed," later in this section. For more information about service packs for these software releases, see Lifecycle Supported Service Packs.NET Framework 3.5 and earlier Impact of 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. An attacker who successfully exploited this vulnerability would be able to read data, such as the view state, which was encrypted by the server. NET use of encryption padding provides information in error responses that can be used by an attacker to read and tamper with the encrypted data. Unlike traditional Web pages, which use a combination of static HTML and scripting, ASP. NET runs on top of Internet Information Services (IIS). The attacker may then be able to read the contents of any file within the web site directory or subdirectories, such as web.config.Additionally, any requests for Web pages which contain the string aspxerrropath= in the querystring portion of the URL will be blocked, and an HTTP error message returned to the client. This vulnerability can also be used for data tampering, which, if successfully exploited, could be used to decrypt and tamper with the data encrypted by the server. NET Framework 3.5 Service Pack 1 and above, this vulnerability can also be used by an attacker to retrieve the contents of any file within the ASP. Note that this vulnerability would not allow an attacker to execute code or to elevate their user rights directly, but it could be used to produce information that could be used to try to further compromise the affected system. For more information, see The Official Microsoft ASP. The web.config file often stores sensitive information.Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability.The following mitigating factors may be helpful in your situation: Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update.

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