CVE-2002-1888 in Toolbar
Summary
by MITRE
CommonName Toolbar 3.5.2.0 sends unqualified domain name requests to the CommonName organization and possibly other web servers for name resolution, which allows those organizations to obtain internal server names.
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Analysis
by VulDB Data Team • 07/05/2024
The vulnerability identified as CVE-2002-1888 resides within the CommonName Toolbar version 3.5.2.0, representing a significant privacy and information disclosure flaw in client-side software. This toolbar, designed to assist users in resolving domain names, inadvertently creates a mechanism for exposing internal network topology information. The flaw operates through the toolbar's implementation of unqualified domain name resolution requests, where domain names lacking fully qualified domain name (FQDN) specifications are submitted to external servers for processing. This behavior fundamentally violates network security principles by creating unintended information leakage channels that can be exploited by malicious actors.
The technical implementation of this vulnerability stems from the toolbar's failure to properly qualify domain names before transmission to external resolution services. When users attempt to resolve domain names through the toolbar, the software sends requests containing only the hostname portion without the complete domain context to the CommonName organization's servers and potentially other web servers. This unqualified request pattern allows the receiving servers to observe internal network naming conventions and server configurations that should remain confidential. The flaw directly maps to CWE-200, Information Exposure, and specifically addresses CWE-209, Information Exposure Through an Error Message, though the primary concern here is information leakage rather than error handling. The vulnerability represents a classic case of insufficient input validation and improper handling of network resolution requests.
The operational impact of this vulnerability extends beyond simple information disclosure, creating potential attack vectors for network reconnaissance and enumeration activities. Organizations using the affected toolbar inadvertently provide attackers with valuable intelligence about their internal server naming schemes, which can be leveraged to plan targeted attacks against specific systems. The exposure of internal server names through these unqualified requests creates a golden opportunity for attackers to map internal network structures and identify potential targets for further exploitation. This vulnerability aligns with ATT&CK technique T1018, Remote System Discovery, as it enables adversaries to gather information about internal network hosts through legitimate tool usage. The indirect nature of this information leakage makes it particularly dangerous because it occurs through seemingly benign user activities rather than direct malicious actions.
Mitigation strategies for this vulnerability require immediate removal of the affected toolbar from all client systems and implementation of proper network segmentation controls. Organizations should implement DNS filtering mechanisms to prevent unqualified domain name resolution requests from leaving internal networks, thereby blocking the information leakage channel. Network administrators must also conduct comprehensive audits of installed software to identify similar vulnerabilities in other client-side applications that may exhibit comparable behaviors. The remediation process should include updating network monitoring tools to detect and alert on unusual DNS resolution patterns that may indicate similar information disclosure vulnerabilities. Additionally, security awareness training should emphasize the importance of software vetting and the potential risks associated with third-party tooling that may inadvertently expose sensitive network information. The vulnerability demonstrates the critical importance of implementing proper network hygiene practices and maintaining strict controls over client-side software installations.