CVE-2002-0928 in IRC Client
Summary
by MITRE
Buffer overflow in the Pirch 98 IRC client allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long hyperlink in a channel or private message.
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Analysis
by VulDB Data Team • 03/29/2025
The vulnerability identified as CVE-2002-0928 represents a critical buffer overflow flaw within the Pirch 98 IRC client software, which operates under the broader context of internet relay chat communication protocols. This vulnerability specifically targets the client's handling of hyperlinks within channel discussions or private messaging contexts, where the software fails to properly validate input lengths before processing. The issue stems from inadequate bounds checking mechanisms that allow malicious actors to craft specially formatted hyperlinks exceeding the allocated buffer space, thereby triggering unintended memory corruption behaviors.
The technical implementation of this vulnerability aligns with common buffer overflow patterns classified under CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking permits data to overwrite adjacent memory locations. In the case of Pirch 98, the flaw manifests when the client processes incoming messages containing excessively long hyperlinks, causing the application to write beyond its intended memory boundaries. This overflow condition can result in program termination, memory corruption, or potentially arbitrary code execution depending on the specific memory layout and exploitation circumstances.
From an operational impact perspective, this vulnerability creates significant risks for users engaging in IRC communications, particularly within collaborative environments where channel discussions and private messaging are prevalent. The denial of service component affects system availability by causing the IRC client to crash or become unresponsive when processing maliciously crafted links, disrupting normal communication workflows. The potential for arbitrary code execution introduces a more severe threat vector that could allow remote attackers to gain control over affected systems, execute malicious payloads, or establish persistent access points within network environments where the vulnerable software is deployed.
The attack surface for this vulnerability extends across various network communication scenarios where Pirch 98 clients interact with potentially malicious actors, including public IRC channels, private messaging sessions, and collaborative workspaces. Attackers can exploit this weakness by simply sending a specially crafted message containing an overly long hyperlink to a target user or channel, requiring minimal technical expertise or resources to execute successfully. This low barrier to exploitation makes the vulnerability particularly dangerous in environments where users frequently engage with untrusted network sources or where automated bot interactions occur.
Mitigation strategies for CVE-2002-0928 should prioritize immediate software updates and patches from the vendor, as the vulnerability represents an inherent design flaw in the client implementation. System administrators should implement network monitoring to detect suspicious hyperlink patterns and consider deploying application firewalls or intrusion detection systems that can identify and block malformed IRC traffic. Additionally, user education regarding the risks of clicking unknown hyperlinks and the importance of maintaining updated client software represents a crucial defensive measure. The vulnerability also highlights the importance of input validation and bounds checking practices as outlined in secure coding standards and should be addressed through comprehensive code review processes that align with industry best practices for preventing buffer overflow conditions.