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source: http://www.securityfocus.com/bid/7393/info A format string vulnerability has been reported for the mod_ntlm Apache module. The problem occurs when logging authentication strings passed in HTTP requests. By passing malicious format specifiers in a request, it may be possibile for an attacker to corrupt sensitive locations in memory. This may result in a denial of service or under certain circumstances could allow an attacker to execute arbitrary code. GET / HTTP/1.0 Authorization: %n%n%n%n