CVE-2000-1078 in ICQ Web Front Server
Summary
by MITRE
ICQ Web Front HTTPd allows remote attackers to cause a denial of service by requesting a URL that contains a "?" character.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/05/2024
The vulnerability described in CVE-2000-1078 affects the ICQ Web Front HTTPd web server component that was part of the ICQ instant messaging client suite. This particular flaw represents a classic denial of service vulnerability that exploits how the web server processes certain URL requests containing specific characters. The vulnerability exists within the HTTP daemon implementation that handles web requests from remote clients, making it accessible to attackers without requiring authentication or specialized privileges. The affected system operates as a web server component that serves content to users accessing ICQ web interfaces, creating a potential attack surface for remote exploitation.
The technical flaw manifests when the HTTPd server processes URLs containing a question mark character, which is a standard delimiter used in web URLs to separate the base URL from query parameters. When an attacker submits a malformed URL with a question mark to the vulnerable server, the HTTP daemon fails to properly handle this character in its request parsing logic. This parsing failure causes the server to either crash completely or become unresponsive, effectively rendering the web service unavailable to legitimate users. The vulnerability stems from inadequate input validation and error handling within the HTTP request processing pipeline, where the server does not properly sanitize or validate the URL structure before attempting to process it.
The operational impact of this vulnerability is significant for any organization or individual running ICQ Web Front HTTPd services. Remote attackers can easily exploit this weakness by simply crafting a malicious URL containing a question mark and submitting it to the target server. The resulting denial of service can disrupt legitimate web services, prevent users from accessing ICQ web interfaces, and potentially cause cascading effects if the web server is part of a larger infrastructure. The attack requires minimal technical expertise and can be executed through simple web browser requests or automated tools, making it particularly dangerous in environments where the service is exposed to untrusted networks.
This vulnerability aligns with CWE-129, which covers improper validation of input boundaries, and CWE-400, which addresses unspecified denial of service conditions. From an ATT&CK framework perspective, this represents a network denial of service technique that can be executed through the web application layer without requiring direct system access. The attack vector falls under T1499.004 for network denial of service, specifically targeting web application availability. Mitigation strategies should focus on implementing proper input validation for all URL processing, configuring the HTTP daemon to handle malformed requests gracefully, and applying firewall rules to restrict access to the vulnerable web interface. Organizations should also consider upgrading to patched versions of ICQ software or implementing network segmentation to limit exposure to this vulnerability. The vulnerability demonstrates the importance of robust input validation in web server implementations and highlights how simple character handling can lead to critical service disruption.