CVE-2000-0848 in WebSphere Application Server
Summary
by MITRE
Buffer overflow in IBM WebSphere web application server (WAS) allows remote attackers to execute arbitrary commands via a long Host: request header.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2000-0848 represents a critical buffer overflow flaw within IBM WebSphere Application Server version 4.0 and earlier releases. This security weakness resides in the web server component of the application server suite, specifically affecting how the system processes incoming HTTP requests. The vulnerability manifests when the server receives a malformed Host header in an HTTP request, where the header value exceeds the allocated buffer space. This particular implementation flaw allows malicious actors to exploit the memory management issue by crafting specially designed HTTP requests with excessively long Host header values, thereby enabling unauthorized command execution on the target system.
The technical exploitation of this buffer overflow vulnerability follows established patterns described in CWE-121, which categorizes buffer overflow conditions as a fundamental memory safety issue. When the web server processes an HTTP request containing a Host header that exceeds the predefined buffer size, the excess data overflows into adjacent memory locations, potentially corrupting critical program execution flow. Attackers can manipulate this overflow to overwrite return addresses, function pointers, or other control data structures within the program memory. The vulnerability specifically affects the HTTP request processing module of IBM WebSphere, which handles the Host header field as defined in RFC 2616, making it a protocol-level implementation issue that impacts the server's ability to safely process network requests. This type of vulnerability directly relates to the ATT&CK technique T1203, which involves the exploitation of buffer overflow conditions to execute arbitrary code on target systems.
The operational impact of CVE-2000-0848 extends far beyond simple denial of service conditions, as successful exploitation provides attackers with complete system compromise capabilities. Remote attackers can leverage this vulnerability to execute arbitrary commands with the privileges of the web server process, which typically runs with elevated system permissions. This allows for full system access, data exfiltration, lateral movement within the network, and potential establishment of persistent backdoors. The vulnerability affects organizations using IBM WebSphere Application Server 4.0 and earlier versions, creating a significant risk for enterprises that may have legacy systems or delayed upgrade cycles. The attack surface is particularly concerning as it requires no authentication to exploit, making it a highly attractive target for automated attacks and malicious actors seeking to compromise web server infrastructure.
Mitigation strategies for CVE-2000-0848 focus primarily on immediate remediation through software updates and patches provided by IBM. Organizations should prioritize upgrading to IBM WebSphere Application Server version 4.1 or later, which includes fixes addressing this specific buffer overflow condition. Additionally, network-level defenses such as web application firewalls and intrusion prevention systems can be configured to monitor and block HTTP requests containing suspiciously long Host headers, though this represents a temporary workaround rather than a permanent solution. Implementing input validation measures within the application layer can help reduce the attack surface, while network segmentation and privilege separation can limit the potential damage from successful exploitation. Security monitoring should include detection of unusual HTTP request patterns and anomalous network traffic that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date software systems and following security best practices, as the exploitation of such fundamental memory safety issues can lead to complete system compromise. Organizations should also consider implementing automated patch management systems to prevent similar vulnerabilities from remaining unaddressed in their infrastructure.