CVE-2003-0553 in Navigator
Summary
by MITRE
Buffer overflow in the Client Detection Tool (CDT) plugin (npcdt.dll) for Netscape 7.02 allows remote attackers to execute arbitrary code via an attachment with a long filename.
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Analysis
by VulDB Data Team • 06/15/2018
The vulnerability identified as CVE-2003-0553 represents a critical buffer overflow flaw within the Client Detection Tool plugin component of Netscape 7.02 browser version. This issue specifically affects the npcdt.dll dynamic link library that handles client detection functionality within the web browser environment. The vulnerability manifests when the plugin processes email attachments containing excessively long filenames, creating a condition where memory boundaries are exceeded during the parsing operation. This buffer overflow vulnerability falls under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The technical exploitation of this vulnerability occurs through the manipulation of email attachment filenames that exceed the allocated buffer size within the CDT plugin. When a user opens an email containing such an attachment, the plugin attempts to process the filename without proper validation, leading to memory corruption that can be leveraged by remote attackers to execute arbitrary code with the privileges of the affected user. The attack vector is particularly dangerous because it requires no user interaction beyond opening the malicious email, making it a prime candidate for phishing campaigns and social engineering attacks. The vulnerability is classified under the attack technique T1059 in the ATT&CK framework, which covers command and scripting interpreter techniques that can be used to execute malicious code through compromised applications.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a foothold for further system compromise and data exfiltration. Successful exploitation could result in complete system takeover, allowing attackers to install additional malware, modify system files, or establish persistent backdoors. The affected Netscape 7.02 browser was widely used in enterprise environments during the early 2000s, making this vulnerability particularly dangerous for organizations that had not yet migrated to more secure browser versions. The memory corruption resulting from this buffer overflow creates unpredictable behavior that can be exploited through various payload delivery mechanisms, including shellcode injection that can bypass basic security controls.
Mitigation strategies for this vulnerability should include immediate patching of the Netscape browser to the latest available version that addresses the buffer overflow condition. Organizations should implement email filtering solutions that can detect and quarantine attachments with suspicious filename lengths, particularly those exceeding standard file naming conventions. Network administrators should also consider implementing application whitelisting policies that restrict execution of the vulnerable plugin component. The fix typically involves implementing proper input validation and bounds checking within the npcdt.dll plugin, ensuring that all filename processing operations include adequate buffer size verification. Security teams should also monitor for exploitation attempts through network traffic analysis, as the buffer overflow may generate specific network signatures that can be detected by intrusion detection systems. Additionally, user education regarding the risks of opening unknown email attachments remains crucial in preventing successful exploitation of this vulnerability.