CVE-2003-0336 in Eudora
Summary
by MITRE
Qualcomm Eudora 5.2.1 allows remote attackers to read arbitrary files via an email message with a carriage return (CR) character in a spoofed "Attachment Converted:" string, which is not properly handled by Eudora.
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Analysis
by VulDB Data Team • 02/03/2025
The vulnerability identified as CVE-2003-0336 represents a critical file inclusion flaw within Qualcomm Eudora version 5.2.1 that enables remote attackers to access arbitrary files on the target system. This vulnerability specifically exploits the email client's improper handling of carriage return characters within spoofed email headers, particularly in the "Attachment Converted:" field. The flaw demonstrates characteristics consistent with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. Attackers can craft malicious email messages that contain carefully constructed carriage return characters within the attachment conversion header, causing Eudora to misinterpret the intended file path and potentially access files outside the intended directory structure.
The technical implementation of this vulnerability relies on the email client's insufficient input validation and sanitization mechanisms when processing email headers. When Eudora encounters an email message with a carriage return character embedded within the "Attachment Converted:" string, the client fails to properly parse or sanitize this input, leading to unexpected behavior in the file handling routines. The vulnerability operates at the application layer, specifically targeting the email parsing and attachment processing components of the client software. This allows an attacker to exploit the flaw without requiring any special privileges or authentication, making it particularly dangerous as it can be triggered through simple email messages sent to unsuspecting users.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it could potentially lead to complete system compromise depending on the file permissions and system configuration. An attacker could leverage this vulnerability to read sensitive system files, configuration data, or user information stored on the affected system. The attack vector is particularly concerning because it operates entirely through email communication, making it difficult to detect and prevent through traditional network security measures. This vulnerability aligns with ATT&CK technique T1190, which covers the exploitation of vulnerabilities in email clients, and demonstrates how seemingly innocuous email processing flaws can create significant security risks. The impact is particularly severe in enterprise environments where email clients are frequently used to handle sensitive corporate communications and data.
Mitigation strategies for CVE-2003-0336 should focus on immediate software updates and patches provided by Qualcomm, as well as network-level protections to prevent malicious email traffic. Organizations should implement email filtering solutions that can detect and block suspicious carriage return characters in email headers, particularly within attachment-related fields. The vulnerability highlights the importance of input validation and proper sanitization of all user-provided data within email clients, which should be addressed through comprehensive code review processes and security testing. System administrators should also consider implementing network segmentation and access controls to limit the potential damage from successful exploitation. Additionally, user education regarding suspicious email attachments and the importance of keeping email client software updated remains crucial in defending against this class of vulnerability, as the flaw can be exploited through social engineering attacks that encourage users to open malicious email messages.