CVE-2002-0984 in Light
Summary
by MITRE
The IRC script included in Light 2.7.x before 2.7.30p5, and 2.8.x before 2.8pre10, running EPIC allows remote attackers to execute arbitrary code if the user joins a channel whose topic includes EPIC4 code.
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Analysis
by VulDB Data Team • 06/27/2024
The vulnerability identified as CVE-2002-0984 represents a critical remote code execution flaw within the EPIC IRC client software that affected versions prior to specific patch releases. This vulnerability resides in the IRC script functionality of Light 2.7.x and 2.8.x versions, creating a dangerous attack surface where malicious actors can exploit the client's handling of channel topics to gain unauthorized system access. The flaw specifically manifests when users join channels containing specially crafted EPIC4 code within the topic field, enabling attackers to execute arbitrary commands on vulnerable systems.
The technical root cause of this vulnerability stems from insufficient input validation and sanitization within the EPIC IRC client's topic processing mechanism. When the client encounters a channel topic containing EPIC4 code, it fails to properly validate or escape the input before executing any embedded commands. This represents a classic command injection vulnerability that aligns with CWE-77 and CWE-94, where user-supplied data is directly interpreted and executed without proper security controls. The vulnerability operates at the application level within the IRC client's scripting engine, where the topic field processing does not distinguish between legitimate channel metadata and malicious command sequences.
From an operational perspective, this vulnerability presents a significant risk to IRC users who may inadvertently join compromised channels or who are targeted by attackers distributing malicious topics. The attack requires minimal user interaction beyond joining a channel, making it particularly dangerous as it can be exploited through social engineering or by simply joining public channels where attackers have pre-registered topics. The remote code execution capability allows attackers to perform various malicious activities including but not limited to system reconnaissance, data exfiltration, privilege escalation, and persistence establishment. This vulnerability directly maps to ATT&CK technique T1059.007 for command and script injection, and T1068 for exploit for privilege escalation.
The impact of exploitation extends beyond individual user compromise to potentially affect entire IRC networks and their connected systems. Attackers can leverage this vulnerability to establish backdoors, monitor communications, or use compromised systems as launching points for further attacks. The vulnerability affects organizations that rely on IRC for communication and collaboration, particularly those using EPIC clients in enterprise environments where IRC remains a legitimate communication channel. Organizations should consider this vulnerability as part of their broader security posture assessment, particularly in environments where IRC is used for business-critical communications or where users may join untrusted channels.
Mitigation strategies for CVE-2002-0984 primarily involve immediate patching of affected EPIC client versions to the patched releases mentioned in the vulnerability description. System administrators should also implement network-level controls to monitor and restrict access to potentially malicious channels or topics, though this approach is less effective given the nature of the vulnerability. Users should be educated about the risks of joining untrusted channels and the importance of keeping their IRC clients updated. Additionally, organizations should consider implementing network segmentation and access controls to limit the potential impact of successful exploitation, while also establishing incident response procedures specifically designed to address IRC-based attacks. The vulnerability highlights the importance of input validation in all scripting and interpretation components of communication software, emphasizing the need for robust security practices throughout the software development lifecycle.