CVE-2002-0989 in Gaim
Summary
by MITRE
The URL handler in the manual browser option for Gaim before 0.59.1 allows remote attackers to execute arbitrary script via shell metacharacters in a link.
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Analysis
by VulDB Data Team • 09/10/2025
The vulnerability identified as CVE-2002-0989 represents a critical security flaw in the Gaim instant messaging client software prior to version 0.59.1. This issue specifically affects the manual browser option within the application's URL handling mechanism, creating a pathway for remote attackers to execute malicious code through carefully crafted links. The vulnerability stems from insufficient input validation and improper sanitization of URL parameters that are processed through the system's shell execution functions. Attackers can exploit this weakness by crafting malicious URLs containing shell metacharacters that get interpreted and executed by the underlying operating system shell when the user clicks on the link within the Gaim application. This type of vulnerability falls under the category of command injection attacks and aligns with CWE-77 which specifically addresses command injection flaws in software systems.
The technical implementation of this vulnerability occurs when users interact with maliciously crafted links within the Gaim application interface. The manual browser option in Gaim was designed to handle external URL navigation but failed to properly sanitize or escape special shell characters present in the URL string. When users clicked on such links, the application would pass the unfiltered URL directly to the system shell for processing, allowing attackers to inject arbitrary shell commands. This flaw demonstrates poor input validation practices and highlights the dangerous combination of user-controllable input being passed directly to shell execution functions without proper sanitization or encoding. The vulnerability is particularly concerning because it requires no special privileges from the attacker beyond the ability to deliver a malicious link to a victim, making it an effective vector for social engineering attacks.
The operational impact of CVE-2002-0989 extends beyond simple code execution, as successful exploitation could allow attackers to gain full control over the victim's system. Attackers could potentially execute commands such as file deletion, system reconnaissance, privilege escalation, or even establish persistent backdoors on the compromised machine. The vulnerability affects all users running Gaim versions prior to 0.59.1, making it particularly dangerous in environments where multiple users are simultaneously connected through the same instant messaging platform. The risk is amplified because instant messaging clients are often used in corporate environments and frequently contain sensitive communications, making the potential for data exfiltration or system compromise significant. This vulnerability also represents a classic example of how seemingly benign application features can become security risks when proper input validation is not implemented.
Mitigation strategies for CVE-2002-0989 primarily focus on upgrading to the patched version of Gaim 0.59.1 or later, which implements proper input sanitization and URL handling mechanisms. Organizations should ensure that all instances of the Gaim client are updated immediately to prevent exploitation. Additionally, system administrators should implement network-level controls to block suspicious URL patterns and consider deploying application whitelisting solutions that restrict the execution of arbitrary shell commands. The vulnerability serves as a reminder of the importance of secure coding practices, particularly around input validation and shell command execution. Security professionals should refer to ATT&CK framework techniques such as T1059.001 for Windows Command Shell and T1059.002 for Unix Shell to understand the broader threat landscape and implement appropriate defensive measures. Organizations should also consider implementing web application firewalls and regular security audits to identify similar vulnerabilities in other applications that might be susceptible to command injection attacks.