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Vulnerability protection

.NET Framework vulnerabilities could allow spoofing

Report ID: MS201305004
Date Published: 15 May 2013

Criticality: Important
Compromise Type: spoofing
Compromise From: remote

Affected Product/Component:

Microsoft .NET Framework 2.0
Microsoft .NET Framework 3.5
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 4
Microsoft .NET Framework 4.5


Two vulnerabilities discovered in Microsoft .NET Framework could lead to spoofing and security bypass.

Detailed Description

Microsoft has issued a security update to resolve two reported vulnerabilities in the .NET Framework. One was caused by improper validation of the signature of an XML file, which could allow an attacker to spoof the contents in the XML file. The other one is a security bypass vulnerability, which was caused by a flaw when creating policy requirements for authentication purposes.

These two vulnerabilities have been patched through the latest update, which introduces a correction in the way that signatures in XML files are validated and a correction in creating policy requirements for authentication. Users are recommended to install the update to their system as a protection measure against possible exploit attempts.

CVE Reference

CVE-2013-1336, CVE-2013-1337


Install the latest security patch for applicable system, available for download from (https://technet.microsoft.com/en-us/security/bulletin/ms13-040)

Security Advisories

For a list of known vulnerabilities affecting F-Secure products and the released fixes, please refer to the Security Advisories page.