CVE-2005-0084 in Ethereal
Summary
by MITRE
Buffer overflow in the X11 dissector in Ethereal 0.8.10 through 0.10.8 allows remote attackers to execute arbitrary code via a crafted packet.
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability identified as CVE-2005-0084 represents a critical buffer overflow flaw within the X11 dissector component of Ethereal network protocol analyzer version 0.8.10 through 0.10.8. This issue resides in the packet parsing functionality that processes X11 protocol traffic, which is commonly used for remote desktop connections and graphical user interface communications over network connections. The flaw manifests when Ethereal encounters specially crafted X11 packets that exceed the allocated buffer space during protocol analysis, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system control.
The technical implementation of this vulnerability stems from inadequate input validation and boundary checking within the X11 dissector module. When Ethereal processes X11 protocol data, it attempts to parse and display various X11 packet structures including request headers, replies, and event messages. The buffer overflow occurs specifically during the parsing of certain X11 protocol fields where the software fails to properly validate the length of incoming data before copying it into fixed-size buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially including return addresses and function pointers, thereby enabling arbitrary code execution with the privileges of the Ethereal process.
The operational impact of this vulnerability extends beyond simple remote code execution, as it represents a significant threat to network monitoring and security analysis environments where Ethereal is commonly deployed. Security analysts and network administrators who rely on Ethereal for traffic analysis and intrusion detection may find their systems compromised simply by analyzing malicious network traffic containing the crafted X11 packets. This creates a dangerous scenario where the very tool designed to detect and analyze security threats becomes a vector for exploitation, potentially allowing attackers to gain complete system control, escalate privileges, or establish persistent access to monitored networks. The vulnerability affects systems running vulnerable versions of Ethereal across multiple operating systems including Windows, Linux, and Unix variants.
Mitigation strategies for CVE-2005-0084 focus primarily on immediate version upgrades to patched releases of Ethereal, which was later renamed Wireshark, as the original developers released corrected versions addressing the buffer overflow conditions. Network administrators should implement network segmentation and access controls to limit exposure of systems running Ethereal to untrusted network traffic. Additionally, deploying network-based intrusion detection systems that can identify and block suspicious X11 protocol traffic patterns provides an additional layer of defense. Organizations should also consider implementing network monitoring with alternative tools that have been verified as free from similar buffer overflow vulnerabilities, while ensuring regular patch management processes are in place to address future security vulnerabilities in network analysis software. This vulnerability aligns with CWE-121 and CWE-122 categories related to stack and heap-based buffer overflows, and represents a typical attack pattern categorized under the MITRE ATT&CK framework's T1059.007 technique for command and scripting interpreter execution.
The broader implications of this vulnerability highlight the critical importance of input validation in network protocol analysis tools, as these applications often process untrusted data from network traffic without adequate sanitization. The flaw demonstrates how protocol dissectors within network analysis software can become attack vectors when proper memory management and boundary checking mechanisms are not implemented. This vulnerability also underscores the necessity of thorough security testing for network monitoring tools, particularly those handling complex protocol parsing scenarios where malformed input could lead to system compromise. Organizations should conduct regular security assessments of their network analysis infrastructure and maintain updated threat intelligence to identify and remediate similar vulnerabilities in other network monitoring and security analysis tools.