After it confirmed that it was investigating reports in the wild of a zero-day(0-day) security hole affecting Internet Information Services (IIS), Microsoft is now saying that it wrapped up the investigation and that no vulnerability was found. Instead of the alleged security vulnerability, the Redmond company noted that it could only confirm the existence of an inconsistency and nothing else, according to Christopher Budd, security response communications lead for Microsoft.“What we have seen is that there is an inconsistency in IIS 6 only in how it handles semicolons in URLs. It’s this inconsistency that the claims have focused on, saying this enables an attacker to bypass content filtering software to upload and execute code on an IIS server,” revealed Budd.
The Redmond company explains that the problem detected in combination with insecure IIS configurations allows potential attackers to build exploits from malicious executables put together out of files with multiple extension, which are handled as ASP files by IIS server. “For the scenario to work, the IIS server must already be configured to allow both “write” and “execute” privileges on the same directory. This is not the default configuration for IIS and is contrary to all of our published best practices.... (read more)


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