CVE-2012-4851 in WebSphere Application Server
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in IBM WebSphere Application Server 8.5 Liberty Profile before 8.5.0.1 allows remote attackers to inject arbitrary web script or HTML via a crafted URI.
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Analysis
by VulDB Data Team • 04/22/2025
The vulnerability identified as CVE-2012-4851 represents a critical cross-site scripting flaw within IBM WebSphere Application Server Liberty Profile version 8.5.0.0 and earlier releases. This security weakness enables remote attackers to execute malicious web scripts or HTML code through the manipulation of Uniform Resource Identifiers, potentially compromising the integrity of web applications and user sessions. The vulnerability resides in the server's handling of incoming URI requests, where insufficient input validation and output encoding mechanisms fail to properly sanitize user-supplied data before it is processed and rendered in web responses. Such a flaw fundamentally undermines the security posture of applications deployed on the platform, creating potential entry points for attackers seeking to exploit user trust and execute unauthorized code within the context of victim browsers.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URI containing script code that gets processed by the WebSphere Liberty Profile server. The server fails to adequately validate or escape special characters and script tags present in the URI parameters, allowing the malicious content to be interpreted as executable code by web browsers when the response is rendered. This processing failure creates a persistent XSS vector where attacker-controlled scripts can be executed in the context of legitimate user sessions, potentially leading to session hijacking, credential theft, or data exfiltration. The vulnerability specifically affects the Liberty Profile variant of IBM WebSphere, which is designed as a lightweight, modular application server for cloud and mobile environments, making it particularly attractive to organizations seeking flexible deployment options.
The operational impact of CVE-2012-4851 extends beyond simple script injection, as it can enable sophisticated attack chains targeting user sessions and application data. Attackers can leverage this vulnerability to perform session hijacking by stealing session cookies, redirect users to malicious sites, or inject malicious content that modifies application behavior. The vulnerability's remote nature means that attackers do not require physical access or network proximity to exploit the flaw, making it particularly dangerous in cloud environments where applications may be exposed to untrusted internet traffic. Organizations using WebSphere Liberty Profile may experience unauthorized data access, application manipulation, and potential compromise of user privacy, especially in scenarios where the server handles sensitive information or user authentication flows.
Mitigation strategies for this vulnerability primarily focus on upgrading to IBM WebSphere Application Server Liberty Profile version 8.5.0.1 or later, which includes the necessary patches to address the input validation and output encoding issues. Organizations should also implement comprehensive input validation mechanisms at multiple layers of their application architecture, including URI parameter sanitization and HTML escaping for all user-supplied data. Network-level protections such as web application firewalls can provide additional defense-in-depth measures, though these should not be considered substitutes for proper application-level fixes. Security monitoring and logging should be enhanced to detect suspicious URI patterns and potential exploitation attempts. From a compliance perspective, this vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and may be categorized under ATT&CK technique T1059.005 for command and scripting interpreter usage in web contexts, emphasizing the need for robust input validation and output encoding practices as recommended by OWASP and NIST cybersecurity frameworks.