CVE-2007-5740 in Perdition Mail Retrieval Proxy
Summary
by MITRE
The format string protection mechanism in IMAPD for Perdition Mail Retrieval Proxy 1.17 and earlier allows remote attackers to execute arbitrary code via an IMAP tag with a null byte followed by a format string specifier, which is not counted by the mechanism.
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Analysis
by VulDB Data Team • 12/26/2024
The vulnerability described in CVE-2007-5740 represents a critical buffer overflow flaw in the IMAPD component of Perdition Mail Retrieval Proxy versions 1.17 and earlier. This issue stems from an insufficient implementation of format string protection mechanisms within the mail retrieval proxy's IMAP protocol handling. The vulnerability specifically targets the way the system processes IMAP tags, which are used to identify and track client-server communication sessions. When a maliciously crafted IMAP tag contains a null byte followed by a format string specifier, the protection mechanism fails to properly account for the null byte in its length calculations, creating a window for exploitation.
The technical flaw exploits a fundamental weakness in input validation and string handling within the IMAPD service. Standard format string protection mechanisms typically count all characters in a string to prevent malicious format specifiers from being executed, but in this case, the null byte is excluded from the counting mechanism. This discrepancy allows attackers to inject format string specifiers that would normally be blocked, effectively bypassing security controls designed to prevent code execution. The vulnerability operates at the application layer, specifically targeting the IMAP protocol implementation, making it particularly dangerous for email server environments where IMAP services are exposed to external networks.
The operational impact of this vulnerability is severe and far-reaching, as it provides remote attackers with the ability to execute arbitrary code on affected systems. Successful exploitation could lead to complete system compromise, allowing attackers to gain unauthorized access, escalate privileges, and potentially establish persistent backdoors within the mail server infrastructure. Given that Perdition Mail Retrieval Proxy is commonly used in enterprise and organizational email environments, the potential for widespread damage increases significantly. The vulnerability affects not only individual system compromise but also poses risks to email integrity, user data confidentiality, and overall network security posture, particularly when the affected mail servers are accessible from untrusted networks.
Mitigation strategies for this vulnerability should focus on immediate patching and system hardening measures. Organizations must upgrade to Perdition Mail Retrieval Proxy versions that address this specific format string handling flaw, typically those beyond version 1.17. Network segmentation and access controls should be implemented to limit exposure of IMAP services to trusted networks only, reducing the attack surface. Additionally, implementing intrusion detection systems capable of identifying suspicious IMAP traffic patterns and monitoring for null byte injection attempts can provide early warning capabilities. From a defensive perspective, this vulnerability aligns with CWE-134, which describes format string vulnerabilities, and maps to ATT&CK techniques involving command and control communications and privilege escalation. Regular security audits and input validation testing should be conducted to ensure that similar flaws are not present in other components of the mail infrastructure, as the vulnerability demonstrates how inadequate input sanitization can lead to complete system compromise.