CVE-2000-0632 in Listserv
Summary
by MITRE
Buffer overflow in the web archive component of L-Soft Listserv 1.8d and earlier allows remote attackers to execute arbitrary commands via a long query string.
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Analysis
by VulDB Data Team • 10/13/2025
The vulnerability identified as CVE-2000-0632 represents a critical buffer overflow flaw within the web archive component of L-Soft Listserv version 1.8d and earlier releases. This security weakness resides in the software's handling of user-supplied input through query strings, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system access. The vulnerability specifically affects the web interface functionality that processes archived mailing list content, making it a target for malicious actors seeking to compromise systems running vulnerable versions of the Listserv software.
The technical implementation of this buffer overflow occurs when the web archive component fails to properly validate or limit the length of incoming query strings. When an attacker submits a specially crafted query string that exceeds the allocated buffer size, the excess data overflows into adjacent memory locations, potentially corrupting program execution flow. This memory corruption can be manipulated to overwrite critical program variables, return addresses, or function pointers, enabling attackers to redirect program execution to malicious code they have injected. The vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to overwrite stack memory and potentially execute arbitrary code with the privileges of the web server process.
The operational impact of this vulnerability extends beyond simple remote code execution, as it provides attackers with a pathway to compromise entire mailing list servers and potentially gain access to sensitive user data stored within the Listserv environment. Organizations running vulnerable Listserv installations face significant risks including unauthorized data access, system takeover, and potential lateral movement within their network infrastructure. The web archive functionality typically processes large volumes of email data and user requests, making it an attractive target for attackers seeking persistent access to mailing list communications. This vulnerability also aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would enable attackers to execute arbitrary commands on the affected system.
Mitigation strategies for CVE-2000-0632 require immediate action to address the root cause through software updates and patches provided by L-Soft. Organizations should prioritize upgrading to Listserv versions that have addressed this buffer overflow vulnerability, as the original vulnerable versions are no longer supported and lack security updates. Network-level defenses including web application firewalls and input validation rules can provide temporary protection by filtering malicious query strings before they reach the vulnerable component. Additionally, implementing proper access controls and restricting web archive functionality to authorized users only can reduce the attack surface. Security monitoring should focus on detecting unusual query patterns and potential exploitation attempts in web server logs, with particular attention to long query strings or malformed input that may indicate exploitation attempts. System hardening measures including disabling unnecessary web features and implementing proper memory protection mechanisms should also be considered as part of comprehensive security posture improvement efforts.