CVE-2001-1067 in Server
Summary
by MITRE
Buffer overflow in AOLserver 3.0 allows remote attackers to cause a denial of service, and possibly execute arbitrary code, via an HTTP request with a long Authorization header.
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Analysis
by VulDB Data Team • 09/29/2025
The vulnerability identified as CVE-2001-1067 represents a critical buffer overflow flaw within AOLserver version 3.0 that exposes systems to remote exploitation. This issue specifically targets the handling of HTTP requests, particularly when processing Authorization headers that exceed normal length parameters. The vulnerability falls under the category of software security flaws that can lead to system compromise and service disruption. Buffer overflow conditions occur when a program attempts to write data beyond the boundaries of a fixed-length memory buffer, potentially overwriting adjacent memory locations. In this case, the flaw manifests when the server processes an HTTP request containing an excessively long Authorization header, creating an opportunity for malicious actors to manipulate memory contents.
The technical exploitation of this vulnerability involves crafting a malicious HTTP request with an oversized Authorization header that exceeds the buffer capacity allocated by the AOLserver software. When the server attempts to process this malformed request, the buffer overflow condition triggers, potentially allowing attackers to overwrite critical memory segments including return addresses and function pointers. This memory corruption can result in unpredictable program behavior, system crashes, or in more severe cases, enable attackers to inject and execute arbitrary code on the vulnerable system. The vulnerability is classified as a remote code execution risk when properly exploited, making it particularly dangerous for publicly accessible web servers. According to CWE standards, this corresponds to CWE-121, which describes heap-based buffer overflow conditions that occur when insufficient bounds checking is performed on dynamically allocated memory.
The operational impact of CVE-2001-1067 extends beyond simple denial of service scenarios to encompass potential system compromise and unauthorized access. Organizations running AOLserver 3.0 may experience complete service disruption when attackers exploit this vulnerability, leading to extended downtime and potential data loss. The remote nature of the attack means that adversaries can target vulnerable systems from anywhere on the internet without requiring physical access or local privileges. This vulnerability directly maps to ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain unauthorized access to systems. The potential for arbitrary code execution makes this a high-severity threat that could allow attackers to establish persistent access, escalate privileges, or use the compromised server as a launch point for further attacks within the network infrastructure.
Mitigation strategies for this vulnerability require immediate patching of affected AOLserver installations to version 3.1 or later, which contains the necessary security fixes. System administrators should implement network-level protections including firewall rules that limit access to web server ports and monitor for suspicious HTTP request patterns. Input validation measures should be deployed to filter and truncate excessively long Authorization headers before they reach the vulnerable server components. Organizations should also consider implementing intrusion detection systems that can identify and alert on malformed HTTP requests attempting to exploit buffer overflow conditions. Additionally, regular security assessments and vulnerability scanning should be conducted to identify other potential buffer overflow vulnerabilities in legacy software systems. The remediation process should include comprehensive testing to ensure that patches do not introduce compatibility issues with existing web applications while maintaining the security posture against this specific threat vector.