CVE-2002-2207 in ssldump
Summary
by MITRE
Buffer overflow in ssldump 0.9b2 and earlier, when running in decryption mode, allows remote attackers to execute arbitrary code via a long RSA PreMasterSecret.
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Analysis
by VulDB Data Team • 07/12/2024
The vulnerability identified as CVE-2002-2207 represents a critical buffer overflow flaw in ssldump version 0.9b2 and earlier releases that operates in decryption mode. This software tool is designed for capturing and analyzing ssl tls network traffic, making it a valuable asset for network security professionals and researchers. The flaw specifically manifests when the application processes ssl connections in decryption mode, which is essential for inspecting encrypted traffic content. The vulnerability stems from insufficient input validation and buffer management within the application's handling of ssl handshake messages, particularly those related to the RSA PreMasterSecret component of the ssl protocol. When an attacker crafts a specially malformed ssl handshake message containing an excessively long RSA PreMasterSecret, the application fails to properly validate the input length before copying it into a fixed-size buffer, leading to memory corruption that can be exploited to execute arbitrary code on the target system.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The flaw occurs during the ssl handshake process when ssldump attempts to parse and decrypt the PreMasterSecret value that is part of the ssl protocol's cryptographic handshake mechanism. The RSA PreMasterSecret is a critical component in ssl/tls encryption that serves as the basis for generating session keys. When this value exceeds the allocated buffer size, the overflow can overwrite crucial program data structures including return addresses, function pointers, or stack canaries, providing attackers with the means to redirect program execution flow. This type of vulnerability falls under the ATT&CK technique T1059.007 for command and script interpreter, as successful exploitation would enable attackers to execute arbitrary code with the privileges of the ssldump process, typically running with elevated permissions to capture network traffic.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for more extensive network intrusions. Since ssldump is commonly used in security monitoring and penetration testing environments, exploitation could compromise systems running this tool, potentially allowing attackers to gain access to sensitive network traffic data that would otherwise be encrypted. The vulnerability affects systems where ssldump is installed with decryption capabilities, particularly in environments where network security monitoring is performed, making it a significant concern for organizations that rely on such tools for traffic analysis. The remote nature of the attack means that an attacker does not need physical access to the target system, as they can exploit the vulnerability through network-based communication. Organizations running vulnerable versions of ssldump should consider the potential for privilege escalation and data exfiltration, as successful exploitation could enable attackers to capture and analyze all ssl traffic passing through the compromised system.
Mitigation strategies for this vulnerability primarily involve immediate software updates to versions that address the buffer overflow issue, as no effective workarounds exist for the flaw itself. System administrators should prioritize patching ssldump installations, particularly those running in decryption mode where the vulnerability is most exploitable. Additionally, organizations should implement network segmentation and access controls to limit exposure of systems running ssldump, as well as consider alternative network monitoring tools that do not exhibit similar buffer overflow vulnerabilities. Network administrators should also monitor for suspicious network traffic patterns that might indicate exploitation attempts, particularly those involving malformed ssl handshake messages. The vulnerability underscores the importance of proper input validation and bounds checking in security tools, as the flaw demonstrates how network analysis software can become a vector for code execution when not properly secured against malformed input. Regular security audits of network monitoring tools should be conducted to identify similar vulnerabilities in other security applications that may be running with elevated privileges and processing network traffic data.