CVE-2008-5279 in ZIM Server
Summary
by MITRE
The Local ZIM Server (zcs.exe) in Zilab Chat and Instant Messaging (ZIM) Server 2.1 and earlier allow remote attackers to execute arbitrary code via (1) heap-based buffer overflows involving multiple vectors including a long room name and a long source account, and (2) a stack-based buffer overflow with a long username in an information request. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 11/30/2017
The vulnerability identified as CVE-2008-5279 affects the Local ZIM Server component of Zilab Chat and Instant Messaging Server version 2.1 and earlier. This represents a critical security flaw that exposes the system to remote code execution attacks through multiple buffer overflow vectors. The vulnerability exists within the zcs.exe process which handles chat and instant messaging server operations, making it a prime target for malicious actors seeking to compromise communication infrastructure. The flaw manifests in two distinct forms of buffer overflows that can be exploited through network-based attacks without requiring authentication.
The technical implementation of this vulnerability involves both heap-based and stack-based buffer overflow conditions that occur when processing user-supplied input. The heap-based overflow can be triggered by sending a long room name or a long source account parameter to the server, while the stack-based overflow occurs when processing a long username in an information request. These buffer overflows occur because the application fails to properly validate input length before copying data into fixed-size buffers, allowing attackers to overwrite adjacent memory locations with malicious code. The heap-based overflow specifically targets dynamic memory allocation structures, while the stack-based variant affects the call stack and can lead to arbitrary code execution through stack pointer corruption.
The operational impact of this vulnerability is severe as it allows remote attackers to execute arbitrary code on affected systems with the privileges of the ZIM server process. This creates a complete system compromise scenario where attackers can gain full control over the messaging server, potentially accessing all chat logs, user credentials, and communication data. The vulnerability affects the core functionality of the ZIM server, making it particularly dangerous for organizations relying on this instant messaging solution for internal communications. Attackers can leverage this vulnerability to establish persistent backdoors, escalate privileges, or use the compromised server as a launch point for further attacks within the network infrastructure. The vulnerability's remote exploitability means that attackers do not need physical access to the system and can target it from anywhere on the internet.
Organizations should immediately implement mitigations including upgrading to a patched version of Zilab Chat and Instant Messaging Server, as the vulnerability affects a core server component. Network segmentation and firewall rules should be configured to restrict access to the ZIM server ports, limiting exposure to authorized users only. Input validation should be strengthened at all application layers to prevent malicious data from reaching the vulnerable buffer operations. System monitoring should be enhanced to detect unusual network traffic patterns or authentication attempts that may indicate exploitation attempts. Security patches should be applied promptly, and the system should be configured to run with minimal privileges to limit potential damage from successful exploitation attempts. The vulnerability aligns with CWE-121 stack-based buffer overflow and CWE-122 heap-based buffer overflow classifications, representing common attack vectors that fall under the ATT&CK technique T1059 for command and script injection. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting these specific buffer overflow patterns.