CVE-2009-0855 in WebSphere Application Server
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the administrative console in IBM WebSphere Application Server (WAS) 6.1 before 6.1.0.23 on z/OS allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 01/10/2025
The vulnerability identified as CVE-2009-0855 represents a critical cross-site scripting flaw within the administrative console of IBM WebSphere Application Server version 6.1 prior to 6.1.0.23 running on z/OS operating systems. This security weakness resides in the administrative interface component that governs server configuration and management operations, making it particularly dangerous as it could be exploited by remote attackers to compromise the entire application server infrastructure. The vulnerability affects organizations relying on IBM WebSphere 6.1 for their enterprise application hosting, particularly those operating in mainframe environments where z/OS systems are prevalent.
The technical nature of this XSS vulnerability stems from insufficient input validation and output encoding mechanisms within the administrative console's web interface. Attackers can leverage unspecified vectors to inject malicious scripts or HTML code that will execute in the context of other users who access the compromised administrative interface. This flaw operates by failing to properly sanitize user-supplied input parameters that are subsequently rendered in web pages without adequate security filtering. The vulnerability is classified under CWE-79 as a failure to sanitize input, which directly enables XSS attacks by allowing malicious content to be interpreted as legitimate web content rather than executable code.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with potential access to sensitive administrative functions and server configuration data. An attacker who successfully exploits this vulnerability could gain unauthorized access to the administrative console, potentially leading to full server compromise, data exfiltration, or service disruption. The z/OS environment adds complexity to the attack surface since mainframe systems often host critical business applications and sensitive data, making successful exploitation particularly damaging. The administrative console access could enable attackers to modify server configurations, deploy malicious applications, or extract confidential information from the application server environment.
Organizations should implement immediate mitigations including applying the official IBM security patch version 6.1.0.23 or later to address this vulnerability. Network segmentation and access controls should be enforced to limit exposure of the administrative console to trusted networks only. Input validation mechanisms should be strengthened through web application firewalls and additional security layers that filter malicious content before it reaches the administrative interface. Regular security assessments should be conducted to identify similar vulnerabilities in other components of the WebSphere ecosystem, as this vulnerability represents a pattern of inadequate input sanitization that may exist in other parts of the application server. The ATT&CK framework categorizes this vulnerability under T1059.001 for command and scripting interpreter, as the exploitation enables attackers to execute malicious scripts within the target environment, potentially leading to further compromise through lateral movement and privilege escalation techniques.