CVE-2017-1121 in WebSphere Application Server
Summary
by MITRE
IBM WebSphere Application Server 7.0, 8.0, and 9.0 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM Reference #: 1997743
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Analysis
by VulDB Data Team • 11/14/2022
The vulnerability identified as CVE-2017-1121 affects IBM WebSphere Application Server versions 7.0, 8.0, and 9.0, representing a critical cross-site scripting flaw that compromises the security integrity of web applications. This vulnerability resides in the web user interface component of the application server, creating an attack vector where malicious actors can inject arbitrary JavaScript code into the browser environment of unsuspecting users. The flaw stems from inadequate input validation and output encoding mechanisms within the server's web interface handling processes, allowing attackers to manipulate the application's behavior through crafted malicious payloads. The vulnerability is particularly concerning as it enables attackers to execute scripts within the context of a user's browser session, potentially compromising the confidentiality and integrity of sensitive data transmitted through the application.
The technical implementation of this cross-site scripting vulnerability occurs when the WebSphere Application Server fails to properly sanitize user-supplied input before rendering it within web pages. This insufficient sanitization creates an opportunity for attackers to embed malicious JavaScript code that executes in the victim's browser when they interact with the affected web interface. The attack typically involves crafting specially formatted input that gets reflected back to the user's browser without proper encoding or validation, allowing the injected script to execute within the security context of the authenticated session. This execution context is particularly dangerous because it operates under the trust relationship between the user and the application, potentially enabling attackers to steal session cookies, credentials, or perform actions on behalf of the authenticated user.
The operational impact of this vulnerability extends beyond simple script execution, as it can lead to significant security breaches including session hijacking, credential theft, and unauthorized access to sensitive application data. Attackers leveraging this vulnerability can potentially capture user authentication tokens and session identifiers, which can then be used to impersonate legitimate users and gain unauthorized access to protected resources within the WebSphere environment. The vulnerability's potential for credential disclosure makes it particularly attractive to threat actors seeking persistent access to enterprise applications. Additionally, the attack can be amplified through social engineering techniques where users are tricked into clicking malicious links or visiting compromised web pages that trigger the XSS payload, making the exploitation more likely in real-world scenarios.
Mitigation strategies for CVE-2017-1121 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the WebSphere Application Server environment. Organizations should apply the vendor-provided security patches and updates released by IBM to address the specific XSS vulnerabilities in affected versions. The implementation of proper content security policies, including the use of security headers such as Content-Security-Policy, can help prevent the execution of unauthorized scripts within the browser context. Additionally, regular security assessments and code reviews should be conducted to identify and remediate similar input validation weaknesses in custom web applications hosted on the WebSphere platform. Organizations should also consider implementing web application firewalls and monitoring solutions to detect and prevent exploitation attempts targeting this vulnerability.
This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and it demonstrates characteristics consistent with attack patterns found in the MITRE ATT&CK framework under the technique of web application attacks. The vulnerability represents a classic example of how insufficient input validation can create persistent security risks in enterprise application servers, emphasizing the importance of defense-in-depth strategies that combine multiple security controls to protect against such exploits. Organizations should prioritize patch management programs and maintain up-to-date security configurations to prevent exploitation of this and similar vulnerabilities in their WebSphere Application Server deployments.