CVE-2006-5478 in eDirectory
Summary
by MITRE
Multiple stack-based buffer overflows in Novell eDirectory 8.8.x before 8.8.1 FTF1, and 8.x up to 8.7.3.8, and Novell NetMail before 3.52e FTF2, allow remote attackers to execute arbitrary code via (1) a long HTTP Host header, which triggers an overflow in the BuildRedirectURL function; or vectors related to a username containing a . (dot) character in the (2) SMTP, (3) POP, (4) IMAP, (5) HTTP, or (6) Networked Messaging Application Protocol (NMAP) Netmail services.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability described in CVE-2006-5478 represents a critical security flaw affecting Novell eDirectory and Novell NetMail products, specifically targeting stack-based buffer overflows that can be exploited remotely to execute arbitrary code. This vulnerability affects multiple versions of Novell's directory and messaging services, creating a significant attack surface for malicious actors seeking to compromise enterprise networks. The flaw manifests in both the eDirectory software and NetMail messaging services, demonstrating the widespread impact of the underlying buffer overflow issue across Novell's product portfolio.
The technical implementation of this vulnerability involves multiple attack vectors that exploit different protocols and service endpoints within the affected Novell software. The primary exploitation method occurs through a long HTTP Host header that triggers an overflow in the BuildRedirectURL function, which is a classic stack-based buffer overflow scenario where insufficient bounds checking allows an attacker to overwrite adjacent memory locations. Additionally, the vulnerability extends to username handling within various messaging protocols including SMTP, POP, IMAP, HTTP, and Networked Messaging Application Protocol, where a dot character in usernames can trigger similar buffer overflow conditions. These attack vectors align with CWE-121 stack-based buffer overflow weakness, specifically targeting the improper handling of user-supplied input in network services.
The operational impact of CVE-2006-5478 is severe and far-reaching, as it allows remote code execution without authentication, enabling attackers to gain full control over affected systems. This vulnerability is particularly dangerous in enterprise environments where Novell eDirectory serves as a critical directory service and NetMail handles sensitive email communications. The ability to exploit these buffer overflows through multiple protocols means that attackers can potentially compromise systems through various entry points, making the attack surface significantly larger than typical single-vulnerability exploits. The remote execution capability eliminates the need for physical access or local network presence, making these systems particularly vulnerable to widespread exploitation across the internet.
The attack patterns associated with this vulnerability follow established methodologies documented in the MITRE ATT&CK framework, particularly the technique of command and control through network protocols. The exploitation process involves sending specially crafted malformed input through network services, which triggers memory corruption leading to arbitrary code execution. Organizations using affected Novell products face significant risk of data breaches, system compromise, and potential lateral movement within their networks. The vulnerability affects both the directory services infrastructure and messaging systems, creating opportunities for attackers to establish persistent access points and escalate privileges within enterprise environments.
Mitigation strategies for CVE-2006-5478 should prioritize immediate patching of affected Novell software to the latest available versions, specifically upgrading eDirectory to 8.8.1 FTF1 or later and NetMail to 3.52e FTF2 or later. Network segmentation and firewall rules should be implemented to restrict access to affected services where possible, particularly limiting direct internet access to messaging protocols. Input validation controls should be enhanced at network boundaries to filter out overly long Host headers and malformed username inputs. Organizations should also implement intrusion detection systems to monitor for suspicious traffic patterns associated with these specific attack vectors, and conduct thorough security assessments to identify any potential exploitation that may have already occurred within their networks. The vulnerability demonstrates the importance of proper input validation and bounds checking in network services, aligning with security best practices outlined in industry standards and security frameworks.