CVE-2008-0434 in AXIGEN Mail Server
Summary
by MITRE
Format string vulnerability in the AXIMilter module in AXIGEN Mail Server 5.0.2 allows remote attackers to execute arbitrary code via format string specifiers in the CNHO command.
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Analysis
by VulDB Data Team • 10/14/2024
The CVE-2008-0434 vulnerability represents a critical format string vulnerability within the AXIMilter module of AXIGEN Mail Server version 5.0.2, presenting a significant security risk to email infrastructure deployments. This vulnerability specifically manifests in the handling of the CNHO command, which is part of the mail server's SMTP protocol implementation. The flaw stems from improper input validation and sanitization within the milter module, allowing malicious actors to inject format specifiers that can be exploited to manipulate memory operations and execute arbitrary code on the target system. The vulnerability is classified under CWE-134, which specifically addresses the use of format strings without proper validation, making it a direct descendant of well-known security weaknesses in software development practices.
The technical exploitation of this vulnerability requires remote attackers to send specially crafted SMTP commands containing format string specifiers to the affected mail server. When the AXIMilter module processes these commands, it fails to properly sanitize the input before passing it to format string functions, creating opportunities for attackers to manipulate the program's execution flow. This type of vulnerability falls under the ATT&CK technique T1059.007, which involves the execution of code through command and scripting interpreters, and more specifically maps to T1078.002 for valid accounts and T1068 for exploit development. The memory corruption resulting from improper format string handling can lead to stack smashing, heap corruption, or controlled code execution at privileged system levels, depending on the target architecture and memory protection mechanisms in place.
The operational impact of CVE-2008-0434 extends beyond immediate code execution capabilities to encompass broader system compromise and potential data breaches within email infrastructure environments. Organizations utilizing AXIGEN Mail Server 5.0.2 face significant risks including unauthorized access to email communications, potential privilege escalation to system administrator levels, and the possibility of establishing persistent backdoors through the executed malicious code. The vulnerability affects email servers that rely on milter modules for content filtering and security enforcement, making it particularly dangerous in enterprise environments where email servers handle sensitive business communications. Security researchers have noted that such format string vulnerabilities often require minimal reconnaissance and can be exploited with relatively simple attack payloads, making them attractive targets for automated exploitation tools and less sophisticated attackers.
Mitigation strategies for CVE-2008-0434 should prioritize immediate patching of affected AXIGEN Mail Server installations to version 5.0.3 or later, which contains the necessary fixes for the format string vulnerability in the AXIMilter module. Organizations should also implement network segmentation and access controls to limit exposure of email servers to untrusted networks, while monitoring for suspicious SMTP traffic patterns that might indicate exploitation attempts. Additional defensive measures include disabling unnecessary milter modules, implementing strict input validation at network boundaries, and deploying intrusion detection systems with signatures specifically targeting format string exploitation patterns. The vulnerability highlights the importance of following secure coding practices and adhering to industry standards such as those outlined in the OWASP Secure Coding Practices and NIST SP 800-53 security controls, particularly those addressing input validation and memory safety in application development. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of email infrastructure, as format string vulnerabilities often indicate broader code quality issues that may affect other software modules within the same application ecosystem.