CVE-2003-0508 in Acrobat Reader
Summary
by MITRE
Buffer overflow in the WWWLaunchNetscape function of Adobe Acrobat Reader (acroread) 5.0.7 and earlier allows remote attackers to execute arbitrary code via a .pdf file with a long mailto link.
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Analysis
by VulDB Data Team • 09/24/2024
The vulnerability identified as CVE-2003-0508 represents a critical buffer overflow flaw within Adobe Acrobat Reader version 5.0.7 and earlier implementations. This security weakness specifically affects the WWWLaunchNetscape function, which is responsible for handling web-based navigation requests within the PDF reader environment. The flaw occurs when processing maliciously crafted pdf files containing excessively long mailto links that trigger memory corruption during normal document rendering operations. The buffer overflow vulnerability stems from inadequate input validation and bounds checking within the application's handling of email link parameters.
The technical exploitation of this vulnerability leverages the inherent memory management issues within the Acrobat Reader's web launch functionality. When a user opens a malicious pdf file containing an overly long mailto URI, the application fails to properly validate the length of the email address parameter, causing a stack-based buffer overflow condition. This overflow corrupts adjacent memory locations including return addresses and function pointers, enabling remote attackers to inject and execute arbitrary code with the privileges of the victim user. The vulnerability demonstrates characteristics consistent with CWE-121, stack-based buffer overflow, and aligns with ATT&CK technique T1203 for legitimate program exploitation.
The operational impact of CVE-2003-0508 extends beyond simple code execution capabilities, as it provides attackers with a vector for privilege escalation and persistent system compromise. Successful exploitation allows adversaries to gain unauthorized access to victim systems, potentially leading to complete system takeover or data exfiltration. The vulnerability's remote exploitability makes it particularly dangerous in enterprise environments where users frequently open pdf documents from untrusted sources. Organizations running affected versions of Acrobat Reader face significant risk of targeted attacks, especially in scenarios where users receive pdf attachments from external parties or browse untrusted websites hosting malicious documents.
Mitigation strategies for this vulnerability require immediate patching of affected Acrobat Reader installations to version 5.0.8 or later, which includes proper input validation and bounds checking for mailto link parameters. System administrators should implement strict email filtering policies to prevent users from receiving pdf attachments from untrusted sources, while network security controls can be configured to block suspicious pdf content at network boundaries. Additional protective measures include disabling automatic execution of external applications when opening pdf files, implementing application whitelisting policies, and conducting regular security assessments to identify potentially vulnerable systems. The vulnerability highlights the importance of maintaining current software versions and implementing defense-in-depth strategies to protect against similar memory corruption flaws that may exist in other applications. Organizations should also consider deploying intrusion detection systems capable of identifying exploitation attempts targeting known buffer overflow vulnerabilities, while maintaining comprehensive incident response procedures to address potential compromises.