CVE-2004-0784 in Gaim
Summary
by MITRE
The smiley theme functionality in Gaim before 0.82 allows remote attackers to execute arbitrary commands via shell metacharacters in the filename of the tar file that is dragged to the smiley selector.
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Analysis
by VulDB Data Team • 06/02/2019
The vulnerability identified as CVE-2004-0784 resides within the Gaim instant messaging client software, specifically affecting versions prior to 0.82. This represents a critical command execution flaw that exploits the application's handling of smiley theme files through a drag-and-drop interface. The vulnerability stems from inadequate input validation and sanitization mechanisms within the smiley theme selection functionality, creating a pathway for remote attackers to inject malicious shell commands through carefully crafted filenames.
The technical exploitation occurs when a user drags a specially crafted tar file containing malicious shell metacharacters in its filename onto the smiley selector interface. The application fails to properly sanitize or escape these filenames before processing them, leading to unintended command execution within the context of the running application. This type of vulnerability falls under the category of command injection attacks, where attacker-controlled input is interpreted as executable commands rather than mere data. The flaw demonstrates a classic lack of proper input validation and output encoding practices that are fundamental to secure software development.
From an operational perspective, this vulnerability presents a significant risk to users who may unknowingly interact with malicious smiley themes distributed through various attack vectors. The attack requires only that a user performs a simple drag-and-drop action, making it particularly dangerous as it can be executed without requiring complex social engineering or additional user interaction beyond the normal application usage patterns. The remote nature of the attack means that malicious actors can deliver payloads through various channels including malicious websites, peer-to-peer networks, or compromised communication channels, making the attack surface quite broad.
The vulnerability aligns with CWE-78, which specifically addresses "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", and demonstrates how improper input handling in graphical user interfaces can lead to severe security consequences. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and scripting interpreter execution, specifically leveraging the application's file processing capabilities to execute arbitrary code. The attack vector utilizes the application's legitimate user interface functionality as a delivery mechanism, making it particularly difficult to detect and prevent through traditional network-based security measures.
Mitigation strategies should focus on implementing proper input validation and sanitization for all user-supplied data, particularly filenames and file paths. The software should employ strict filename validation that rejects or escapes special shell metacharacters before processing. Additionally, the application should run with minimal privileges and implement proper sandboxing techniques to limit the potential impact of successful exploitation. Users should be encouraged to keep their software updated and to exercise caution when interacting with third-party smiley themes or any file types that may be processed through drag-and-drop interfaces. The vulnerability underscores the importance of secure coding practices and input validation across all application components, particularly those with user-facing interfaces that process external data.