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A vulnerability in DNSAPI.dll, the DNS client library in multiple versions of Microsoft Windows (XP SP2/SP3, Server 2003 SP2, Vista SP1/SP2, Server 2008 Gold/SP2/R2/R2 SP1, and Windows 7 Gold/SP1), allows remote attackers to execute arbitrary code. The flaw is due to improper processing of DNS queries, specifically when handling crafted LLMNR broadcast queries or queries from malicious applications.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit auxiliary module targeting a denial-of-service (DoS) vulnerability in Microsoft's DNSAPI.dll (CVE-2011-0657, MS11-030). The exploit works by sending specially crafted LLMNR (Link-Local Multicast Name Resolution) queries with a leading '.' character to the target's UDP port 5355 (default LLMNR port), typically at the multicast address 224.0.0.252. Vulnerable systems (Windows Vista and later, unpatched) will experience a crash or stack exhaustion in the DNSAPI.dll service, resulting in a temporary denial of service. The module is written in Ruby and is designed to be run within the Metasploit framework. The exploit does not provide code execution, only service disruption. The file structure is simple, with a single Ruby file implementing the exploit logic.
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