CVE-2008-1777 in eDirectory
Summary
by MITRE
The eDirectory Host Environment service (dhost.exe) in Novell eDirectory 8.8.2 allows remote attackers to cause a denial of service (CPU consumption) via a long HTTP HEAD request to TCP port 8028.
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Analysis
by VulDB Data Team • 07/25/2024
The vulnerability identified as CVE-2008-1777 affects the eDirectory Host Environment service component known as dhost.exe within Novell eDirectory version 8.8.2. This service operates on TCP port 8028 and provides HTTP hosting capabilities for directory services. The flaw represents a classic denial of service vulnerability that can be exploited by remote attackers to consume excessive system resources and render the service unavailable to legitimate users. The vulnerability specifically targets the HTTP HEAD request processing mechanism within the service, demonstrating how seemingly benign network operations can be weaponized for malicious purposes. This type of vulnerability falls under the category of resource exhaustion attacks that can severely impact service availability and business operations.
The technical implementation of this vulnerability stems from inadequate input validation within the dhost.exe service when processing HTTP HEAD requests. When a remote attacker sends a specially crafted HTTP HEAD request containing an excessive amount of data or malformed parameters to the designated TCP port 8028, the service fails to properly handle the request and instead consumes an excessive amount of CPU cycles. This occurs because the service lacks proper bounds checking and input sanitization mechanisms that would normally prevent such requests from consuming disproportionate system resources. The flaw essentially allows attackers to trigger a condition where the service becomes unresponsive due to continuous CPU utilization, effectively creating a denial of service scenario. This vulnerability is classified as a CWE-400 vulnerability, specifically related to uncontrolled resource consumption, and represents a common pattern in web service implementations where input validation is insufficient.
The operational impact of this vulnerability extends beyond simple service disruption to potentially affect critical directory services that organizations rely upon for authentication, authorization, and identity management. When the eDirectory Host Environment service becomes unresponsive due to excessive CPU consumption, it can prevent legitimate users from accessing directory services, potentially causing cascading failures throughout enterprise networks that depend on these services. The vulnerability is particularly concerning because it requires no authentication to exploit, making it accessible to any remote attacker with network access to the affected port. This characteristic aligns with ATT&CK technique T1499.004, which involves network denial of service attacks that consume network resources. Organizations may experience significant downtime and service degradation, particularly in environments where directory services are critical infrastructure components for user authentication and access control.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and resource limiting mechanisms within the affected service. Network administrators should consider implementing firewall rules to restrict access to TCP port 8028 to only trusted sources, thereby reducing the attack surface. Additionally, applying the vendor-provided security patches and updates for Novell eDirectory 8.8.2 is essential to address the root cause of the vulnerability. System monitoring should be enhanced to detect unusual CPU consumption patterns that may indicate exploitation attempts. The implementation of rate limiting and request size limitations can help prevent malicious requests from consuming excessive resources. Organizations should also consider network segmentation to isolate directory services and reduce the potential impact of such attacks. From a defensive perspective, this vulnerability highlights the importance of regular security assessments and vulnerability management processes that can identify and remediate similar issues before they can be exploited by threat actors. The vulnerability demonstrates the critical need for secure coding practices and proper input validation in service implementations, particularly those handling network requests from untrusted sources.