CVE-2006-0537 in eXchange POP3
Summary
by MITRE
Buffer overflow in the POP3 server in Kinesphere Corporation eXchange before 5.0.060125 allows remote attackers to execute arbitrary code via a long RCPT TO argument.
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Analysis
by VulDB Data Team • 06/16/2024
The vulnerability described in CVE-2006-0537 represents a critical buffer overflow flaw within the POP3 server component of Kinesphere Corporation eXchange software prior to version 5.0.060125. This issue resides in the handling of email recipient addresses during the POP3 protocol processing, specifically when the server encounters a lengthy RCPT TO argument. The buffer overflow occurs when the server fails to properly validate the length of incoming data, allowing malicious actors to craft specially formatted email commands that exceed the allocated buffer space. Such vulnerabilities fall under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking leads to memory corruption. The affected POP3 server implementation demonstrates a classic stack-based buffer overflow vulnerability that can be exploited through network-based attacks.
The operational impact of this vulnerability extends beyond simple code execution capabilities, as it provides remote attackers with the means to completely compromise the affected system. When an attacker sends a malformed RCPT TO command containing an excessively long argument, the server's memory management routines fail to handle the overflow gracefully, potentially allowing the attacker to overwrite critical memory locations including return addresses and function pointers. This memory corruption can be leveraged to redirect program execution flow and inject malicious code into the server process. The vulnerability is particularly dangerous because it operates at the protocol level, meaning that attackers can exploit it without requiring authentication or prior access to the system. This aligns with the attack pattern described in MITRE ATT&CK framework under technique T1203, which involves the exploitation of software vulnerabilities to gain unauthorized access to systems.
The exploitation of this buffer overflow vulnerability requires careful crafting of the malicious payload to ensure successful memory corruption and code execution. Attackers typically construct RCPT TO arguments that exceed the buffer capacity, often using techniques such as stack pivoting or return-oriented programming to achieve their objectives. The vulnerability affects systems running Kinesphere Corporation eXchange versions earlier than 5.0.060125, making it a significant concern for organizations that have not updated their email infrastructure. The impact includes potential complete system compromise, data exfiltration, and the ability to establish persistent access to the affected server. Organizations should consider implementing network segmentation and intrusion detection systems to monitor for suspicious POP3 traffic patterns that might indicate exploitation attempts. The remediation strategy involves upgrading to Kinesphere Corporation eXchange version 5.0.060125 or later, which includes proper input validation and buffer management controls. Additionally, security measures such as address space layout randomization and stack canaries should be implemented to provide defense-in-depth against similar vulnerabilities that may exist in other components of the email infrastructure.