CVE-2003-0654 in autorespond
Summary
by MITRE
Buffer overflow in autorespond may allow remote attackers to execute arbitrary code as the autorespond user via qmail.
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Analysis
by VulDB Data Team • 05/25/2019
The vulnerability identified as CVE-2003-0654 represents a critical buffer overflow flaw within the autorespond component of qmail email server software. This vulnerability specifically affects the qmail-autorespond functionality which handles automated email responses, creating a potential security gateway for remote attackers to gain unauthorized system access. The flaw manifests when the autorespond utility processes certain input parameters without proper bounds checking, allowing malicious data to overflow allocated memory buffers and potentially overwrite critical program execution structures.
The technical implementation of this vulnerability stems from inadequate input validation within the qmail-autorespond module. When the system processes email headers or command-line arguments containing specially crafted malicious input, the buffer overflow occurs in memory regions that control program flow. This type of vulnerability falls under the CWE-121 buffer overflow category, which specifically addresses the condition where data written to a buffer exceeds the buffer's allocated size, leading to memory corruption. The flaw enables attackers to manipulate the program's execution path by overwriting return addresses or function pointers, effectively allowing for arbitrary code execution within the security context of the autorespond user account.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides remote attackers with the ability to execute arbitrary code with the privileges of the autorespond user. This typically translates to the attacker gaining access to the mail server's operational environment, potentially leading to complete system compromise if the autorespond user maintains elevated privileges or has access to sensitive system resources. The attack vector requires only remote access to the mail server's functionality, making it particularly dangerous as it can be exploited from anywhere on the internet without requiring physical access or prior authentication to the system. This vulnerability directly aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would enable attackers to execute malicious commands within the compromised system environment.
Mitigation strategies for CVE-2003-0654 should prioritize immediate patching of affected qmail installations, as the vulnerability has been widely documented and remediated through official software updates. System administrators must ensure all qmail implementations are updated to versions that include proper input validation and bounds checking mechanisms within the autorespond module. Additional defensive measures include implementing proper network segmentation to limit access to mail server functionality, configuring strict input validation at all network interfaces, and employing intrusion detection systems to monitor for suspicious email processing activities. The vulnerability also highlights the importance of secure coding practices and input sanitization, particularly in mail server applications where user-controllable data flows through complex processing pipelines. Organizations should conduct comprehensive vulnerability assessments to identify all instances of qmail installations and ensure complete remediation across their infrastructure to prevent exploitation attempts.