CVE-2001-0029 in Oops Proxy Server
Summary
by MITRE
Buffer overflow in oops WWW proxy server 1.4.6 (and possibly other versions) allows remote attackers to execute arbitrary commands via a long host or domain name that is obtained from a reverse DNS lookup.
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Analysis
by VulDB Data Team • 06/27/2024
The vulnerability identified as CVE-2001-0029 represents a critical buffer overflow flaw within the oops WWW proxy server version 1.4.6 and potentially other iterations of the software. This security weakness stems from inadequate input validation mechanisms that fail to properly handle excessively long host or domain names during reverse DNS lookup operations. The flaw exists in the server's handling of network requests where it processes domain name resolution information without sufficient bounds checking, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system control.
The technical implementation of this vulnerability occurs when the oops proxy server performs reverse DNS lookups on incoming requests and subsequently stores the resulting host or domain name information in a fixed-size buffer. When an attacker crafts a maliciously long host or domain name that exceeds the allocated buffer space, the overflow condition manifests, potentially overwriting adjacent memory locations and allowing for arbitrary code execution. This type of buffer overflow vulnerability aligns with CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking permits memory corruption. The attack vector is particularly concerning because it requires no authentication and can be executed remotely, making it highly accessible to malicious actors.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise and potential data exfiltration. Attackers who successfully exploit this buffer overflow can execute arbitrary commands with the privileges of the proxy server process, which typically runs with elevated permissions to handle network traffic. This presents a significant risk to organizations relying on the oops proxy server, as compromised systems can serve as launching points for further attacks within the network infrastructure. The vulnerability also aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, since successful exploitation enables attackers to execute system commands directly through the compromised proxy server.
Mitigation strategies for CVE-2001-0029 must address both immediate remediation and long-term architectural improvements. Organizations should prioritize patching the affected oops proxy server software to the latest available version that contains buffer overflow protections and proper input validation mechanisms. Additionally, implementing network segmentation and access controls can limit the potential damage from successful exploitation attempts. The implementation of input validation measures such as length restrictions on host and domain name fields, combined with proper buffer management practices, provides defense-in-depth protection against similar vulnerabilities. Security monitoring should include detection of unusual reverse DNS lookup patterns and malformed host name entries that could indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar buffer overflow conditions in other network infrastructure components.