CVE-2003-1220 in People Tools
Summary
by MITRE
BEA WebLogic Server proxy plugin for BEA Weblogic Express and Server 6.1 through 8.1 SP 1 allows remote attackers to cause a denial of service (proxy plugin crash) via a malformed URL.
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Analysis
by VulDB Data Team • 06/27/2019
The vulnerability identified as CVE-2003-1220 affects BEA WebLogic Server proxy plugin versions 6.1 through 8.1 SP1, specifically impacting both WebLogic Express and standard Server installations. This issue represents a classic denial of service weakness that can be exploited by remote attackers to crash the proxy plugin component, thereby disrupting service availability for legitimate users. The vulnerability stems from inadequate input validation within the proxy plugin's URL handling mechanism, which fails to properly process malformed URL requests.
The technical flaw manifests when the proxy plugin receives malformed URLs that exceed expected parameter structures or contain unexpected characters that trigger buffer overflows or memory corruption within the plugin's processing routines. This type of vulnerability aligns with CWE-122, which describes buffer overflow conditions in heap-based data structures, and more broadly with CWE-400, which encompasses unspecified denial of service vulnerabilities. The proxy plugin's failure to sanitize incoming URL parameters creates an exploitable condition where crafted malicious URLs can cause the plugin to crash or become unresponsive, effectively rendering the web server unable to process legitimate requests through the proxy component.
From an operational perspective, this vulnerability poses significant risk to organizations relying on BEA WebLogic Server for enterprise web applications. The remote attack vector means that adversaries can exploit this weakness from any network location without requiring local system access or authentication credentials. The impact extends beyond simple service disruption as the proxy plugin crash can potentially affect the entire web application stack, depending on how the proxy component integrates with the broader server architecture. Attackers can repeatedly exploit this weakness to maintain sustained denial of service conditions, making it particularly dangerous in production environments where availability is critical. This vulnerability also demonstrates the importance of input validation at all levels of application architecture, as the proxy plugin serves as a critical intermediary component between client requests and backend server processes.
The exploitation of this vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks through resource exhaustion or system crashes. Organizations should implement immediate mitigations including applying the vendor-provided patches, implementing URL filtering mechanisms at network boundaries, and configuring intrusion detection systems to monitor for suspicious URL patterns. Additionally, network segmentation strategies should be employed to limit the potential impact of such attacks, while monitoring systems should be enhanced to detect proxy plugin crashes or abnormal processing patterns. The vulnerability underscores the necessity of comprehensive security testing including fuzzing techniques to identify similar input validation weaknesses in web application components and emphasizes the importance of maintaining up-to-date security patches across all server components to prevent exploitation of known vulnerabilities.