CVE-2001-0164 in Directory Server
Summary
by MITRE
Buffer overflow in Netscape Directory Server 4.12 and earlier allows remote attackers to cause a denial of service or execute arbitrary commands via a malformed recipient field.
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Analysis
by VulDB Data Team • 04/08/2019
The vulnerability described in CVE-2001-0164 represents a critical buffer overflow condition within the Netscape Directory Server version 4.12 and earlier releases. This flaw exists in the server's handling of email recipient fields, specifically when processing malformed data within the recipient header of email messages. The buffer overflow occurs during the parsing of the recipient field, where insufficient input validation allows an attacker to craft specially formatted email messages that exceed the allocated buffer space. This particular vulnerability falls under the CWE-121 category of buffer overflow conditions, specifically manifesting as a stack-based buffer overflow that can be exploited through remote network access. The security implications extend beyond simple denial of service to potentially allow arbitrary code execution within the context of the affected server process.
The technical exploitation of this vulnerability relies on the server's failure to properly validate the length and content of recipient fields in incoming email messages. When a maliciously crafted email is received, the server attempts to process the recipient information without adequate bounds checking, causing the buffer to overflow and potentially overwrite adjacent memory locations. This memory corruption can result in unpredictable behavior including application crashes, which constitutes the denial of service component of the vulnerability. However, more severe exploitation scenarios may allow attackers to inject and execute arbitrary code by carefully crafting the overflow to overwrite critical program execution pointers or return addresses, effectively hijacking the server's execution flow. The attack vector requires remote network access to the affected directory server, making it particularly dangerous in environments where the server is exposed to untrusted network traffic.
The operational impact of this vulnerability extends significantly beyond immediate service disruption. Organizations relying on Netscape Directory Server for directory services, authentication, or email routing face substantial risk from this flaw. The potential for remote code execution means that attackers could gain unauthorized access to the server and potentially escalate privileges to the level of the directory service account. This could lead to complete compromise of the directory infrastructure, allowing attackers to access sensitive user information, modify directory entries, or establish persistent access points within the network. The vulnerability affects not only the immediate availability of directory services but also poses a serious threat to overall network security and data integrity. The attack surface is particularly broad given that directory servers often serve as central points of authentication and authorization for multiple network services, making successful exploitation potentially devastating for the entire infrastructure.
Mitigation strategies for CVE-2001-0164 must address both immediate remediation and long-term security improvements. The primary recommendation involves upgrading to a patched version of the Netscape Directory Server, as vendors typically released security updates to address this specific buffer overflow condition. Organizations should also implement network segmentation and access controls to limit exposure of directory servers to untrusted networks, reducing the attack surface available to potential adversaries. Input validation should be enhanced at multiple layers including network firewalls, email gateways, and server-side processing to detect and reject malformed recipient fields before they can trigger the buffer overflow condition. Network monitoring and intrusion detection systems should be configured to detect unusual traffic patterns or malformed email headers that may indicate exploitation attempts. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other server applications and ensure comprehensive protection against similar threats. The vulnerability serves as a reminder of the critical importance of proper input validation and memory management in server applications, aligning with security best practices outlined in various cybersecurity frameworks and standards including those from the mitre corporation's attack framework and common weakness enumeration catalog.