CVE-2002-0685 in Freeware
Summary
by MITRE
Heap-based buffer overflow in the message decoding functionality for PGP Outlook Encryption Plug-In, as used in NAI PGP Desktop Security 7.0.4, Personal Security 7.0.3, and Freeware 7.0.3, allows remote attackers to modify the heap and gain privileges via a large, malformed mail message.
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Analysis
by VulDB Data Team • 10/25/2024
The vulnerability described in CVE-2002-0685 represents a critical heap-based buffer overflow affecting the PGP Outlook Encryption Plug-In component within various versions of NAI PGP Desktop Security. This flaw exists within the message decoding functionality that processes encrypted email communications, specifically targeting the handling of malformed mail messages. The vulnerability impacts multiple product versions including PGP Desktop Security 7.0.4, Personal Security 7.0.3, and Freeware 7.0.3, indicating a widespread issue within the PGP security ecosystem that could potentially compromise numerous email encryption systems. The nature of this vulnerability places it squarely within the CWE-121 heap-based buffer overflow category, which is classified as a fundamental memory safety issue where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The technical exploitation of this vulnerability occurs when the PGP Outlook Plug-In processes a specially crafted, large, and malformed mail message that exceeds the allocated heap buffer size. During the decoding process, the insufficient input validation and boundary checking cause the program to write data beyond the intended buffer boundaries, resulting in heap corruption. This heap modification allows remote attackers to potentially overwrite critical memory structures, function pointers, or other program state information that could be leveraged to execute arbitrary code with the privileges of the affected application. The vulnerability specifically targets the heap memory management system, making it particularly dangerous as heap corruption can lead to unpredictable program behavior, application crashes, or complete system compromise depending on the execution environment and privilege levels.
The operational impact of CVE-2002-0685 extends beyond simple denial of service scenarios, as the heap-based buffer overflow creates opportunities for privilege escalation attacks that could allow remote code execution. Since the vulnerability affects an email encryption plug-in, successful exploitation could enable attackers to intercept and manipulate encrypted communications, potentially compromising sensitive data that users expect to be protected by PGP encryption. The remote attack vector means that adversaries could exploit this vulnerability without requiring physical access to target systems, making it particularly concerning for enterprise environments where email systems are critical infrastructure components. This vulnerability directly relates to ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation could lead to arbitrary code execution, and T1566 for phishing attacks, since the vulnerability could be exploited through email message delivery.
Mitigation strategies for this vulnerability should focus on immediate patching of affected PGP software versions, as well as implementing network-based protections such as email filtering systems that can identify and block malformed email content before it reaches vulnerable endpoints. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts. The vulnerability demonstrates the importance of input validation and memory safety practices in security-critical applications, aligning with industry best practices outlined in secure coding standards and emphasizing the need for regular security assessments of encryption and messaging systems. Given the age of this vulnerability, organizations should prioritize upgrading to supported versions of PGP software and implementing additional email security measures to protect against similar threats that may exist in legacy systems.