CVE-2000-0909 in Pine
Summary
by MITRE
Buffer overflow in the automatic mail checking component of Pine 4.21 and earlier allows remote attackers to execute arbitrary commands via a long From: header.
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Analysis
by VulDB Data Team • 12/19/2024
The vulnerability identified as CVE-2000-0909 represents a critical buffer overflow flaw within the Pine email client version 4.21 and earlier. This security issue resides in the automatic mail checking component of the application, which processes incoming email messages and extracts information from various header fields. The vulnerability specifically targets the handling of the From: header field, which is a standard email header used to identify the sender of an email message. When Pine processes an email with an excessively long From: header, the application fails to properly validate the input length, leading to a buffer overflow condition that can be exploited by remote attackers.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within Pine's email parsing routines. When the application encounters a From: header that exceeds the allocated buffer size, the excess data overflows into adjacent memory locations, potentially corrupting critical program data or executable code. This buffer overflow condition creates an opportunity for attackers to inject and execute arbitrary code on the target system with the privileges of the user running Pine. The vulnerability is particularly dangerous because it can be triggered remotely through the simple act of sending an email message with a maliciously crafted From: header, making it an attractive target for automated attacks.
The operational impact of CVE-2000-0909 extends beyond immediate code execution capabilities to encompass broader system compromise and data integrity threats. Attackers leveraging this vulnerability could potentially gain unauthorized access to email accounts, access sensitive information stored within the Pine client, or use the compromised system as a stepping stone for further network infiltration. The vulnerability affects organizations that rely on Pine as their primary email client, particularly those with less sophisticated security monitoring and patch management processes. Given that Pine was widely used in academic and research environments during the late 1990s and early 2000s, this vulnerability could have affected numerous systems with potentially sensitive research data or institutional communications.
This vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of improper input validation in network applications. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and control communication, privilege escalation, and initial access through remote services. The attack vector specifically corresponds to T1190 - Exploit Public-Facing Application, where attackers exploit vulnerabilities in email clients to gain system access. Organizations should implement immediate mitigations including upgrading to Pine versions 4.22 or later, which contain the necessary buffer overflow protections, and implementing email filtering rules that limit header field lengths. Network segmentation and monitoring for unusual email traffic patterns can also help detect potential exploitation attempts. The vulnerability serves as a historical example of how seemingly minor input validation flaws can create significant security risks in widely deployed applications, emphasizing the importance of secure coding practices and regular security assessments.