CVE-2004-2005 in Eudora
Summary
by MITRE
Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code via an e-mail with (1) a link to a long URL to the C drive or (2) a long attachment name.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/30/2024
The vulnerability described in CVE-2004-2005 represents a classic buffer overflow flaw affecting the popular email client Eudora versions 5.2.1, 6.0.3, and 6.1 on Windows platforms. This security weakness stems from inadequate input validation mechanisms within the email processing routines that handle URL and attachment name parsing. The vulnerability specifically manifests when the email client encounters malformed or excessively long input strings in either the URL field of email links or the filename portion of attachments, creating conditions where memory buffers are exceeded during processing operations.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. In the context of Eudora, when processing a maliciously crafted email containing an overly long URL or attachment name, the application fails to properly validate input length before copying data into fixed-size memory buffers. This allows an attacker to overwrite critical memory segments including return addresses and program execution pointers, effectively enabling remote code execution capabilities.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete system compromise potential through remote exploitation. The attack vector requires only that a victim receive and process a specially crafted email message, making this vulnerability particularly dangerous in enterprise environments where email is a primary communication channel. Successful exploitation can result in full system control, data exfiltration, and persistence mechanisms establishment, with the attacker able to execute arbitrary code with the privileges of the affected user account. This vulnerability directly maps to ATT&CK technique T1190 for exploitation of remote services and T1059 for command and scripting interpreter usage.
Mitigation strategies for CVE-2004-2005 should prioritize immediate patch deployment from the vendor as the primary defense mechanism, though organizations without access to official patches may implement input length restrictions and email content filtering policies. Network-based defenses including email gateway filtering can help prevent malicious emails containing overly long URLs or attachment names from reaching end users. Additionally, implementing application whitelisting controls and restricting email client functionality through group policies can reduce exploitation success rates. System hardening measures such as stack canaries, DEP (Data Execution Prevention), and ASLR (Address Space Layout Randomization) can provide additional layers of protection against successful exploitation attempts, though these defenses may not completely prevent buffer overflow exploitation in vulnerable applications.