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A buffer overflow vulnerability exists in mIRC versions prior to 6.11, where the application fails to properly handle long irc:// URLs. This flaw allows remote attackers to trigger a buffer overflow condition by enticing a user to open a specially crafted irc:// URL, potentially leading to the execution of arbitrary code within the context of the user running mIRC.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a single Metasploit module (mirc_irc_url.rb) that exploits a stack buffer overflow vulnerability in mIRC version 6.1 (CVE-2003-1336). The exploit is delivered via a malicious web server that serves an HTML page containing an iframe with a specially crafted irc:// URL. When a victim with a vulnerable version of mIRC installed visits the page, the irc:// URL is processed, triggering the buffer overflow and allowing arbitrary code execution. The module supports custom Metasploit payloads (up to 400 bytes, with specific bad characters avoided) and targets Windows 2000 Pro (English) and Windows XP Pro SP0/SP1 (English). The main attack vector is browser-based social engineering, requiring the victim to visit the attacker's web page. The only fingerprintable endpoint is the crafted irc:// URL embedded in the HTML response.
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