CVE-2002-1194 in NetBSD
Summary
by MITRE
Buffer overflow in talkd on NetBSD 1.6 and earlier, and possibly other operating systems, may allow remote attackers to execute arbitrary code via a long inbound message.
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Analysis
by VulDB Data Team • 06/30/2024
The vulnerability described in CVE-2002-1194 represents a critical buffer overflow flaw in the talkd daemon functionality across NetBSD 1.6 and earlier versions, with potential exploitation on other operating systems. This issue stems from inadequate input validation within the talkd service that handles communication between users on networked systems. The vulnerability specifically manifests when the daemon processes inbound messages that exceed predetermined buffer size limits, creating a condition where adjacent memory regions can be overwritten with malicious data.
The technical implementation of this buffer overflow occurs at the network communication layer where the talkd daemon receives and processes messages from remote clients. When an attacker sends a message exceeding the allocated buffer space, the excess data overflows into adjacent memory locations, potentially corrupting critical program structures including return addresses and function pointers. This memory corruption can be exploited to redirect program execution flow and ultimately achieve arbitrary code execution on the target system with the privileges of the talkd daemon process. The vulnerability falls under CWE-121 which categorizes buffer overflow conditions that occur when insufficient bounds checking is performed on data structures, and aligns with ATT&CK technique T1059.007 for command and script injection through network services.
The operational impact of this vulnerability extends beyond simple remote code execution as it provides attackers with a potential foothold for further system compromise. Since talkd typically runs with elevated privileges to facilitate user communication, successful exploitation could grant attackers complete control over the affected system. The vulnerability's prevalence across multiple operating systems suggests it may be present in similar implementations of the talk protocol, making it a widespread concern for network administrators. Attackers could leverage this vulnerability to establish persistent access, escalate privileges, or use the compromised system as a launch point for attacks against other networked systems.
Mitigation strategies for CVE-2002-1194 should prioritize immediate patching of affected NetBSD versions and implementation of network segmentation to limit exposure. System administrators should disable the talkd service if not actively required, as it represents an unnecessary attack surface. Network-level protections including firewall rules that restrict access to the talkd port and intrusion detection systems can provide additional layers of defense. The vulnerability demonstrates the importance of input validation and proper memory management in network services, highlighting the need for regular security assessments and vulnerability scanning of system components. Organizations should also implement network monitoring to detect unusual communication patterns that might indicate exploitation attempts, particularly focusing on traffic to and from the talkd service port.