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Exim versions before 4.70 contain a heap-based buffer overflow in the string_vformat function in string.c. A remote attacker can trigger the overflow during an SMTP session by issuing two MAIL commands and supplying a large message with crafted headers, causing improper rejection logging and enabling arbitrary code execution.
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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 targeting Exim mail servers prior to version 4.69. The exploit leverages a heap buffer overflow in the 'string_vformat' function, triggered via specially crafted SMTP messages. The module connects to the target's SMTP service, sends a large message to fill the buffer, and then injects a malicious header to overwrite the ACL for the 'MAIL FROM' command. This allows arbitrary shell command execution as the Exim user. If the target system has Perl installed, the module attempts to escalate privileges to root by exploiting a secondary vulnerability (CVE-2010-4345), creating temporary files in /var/tmp and executing a Perl script as root. The module is fully weaponized, supporting customizable command payloads, and is part of the Metasploit framework. The only file present is a Ruby script implementing the exploit logic, with options for configuring email addresses, EHLO name, and advanced options for source address and privilege escalation.
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