CVE-2018-1793 in WebSphere Application Server
Summary
by MITRE
IBM WebSphere Application Server 7.0, 8.0, 8.5, and 9.0 using SAML ear 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 X-Force ID: 148948.
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Analysis
by VulDB Data Team • 05/22/2023
The vulnerability identified as CVE-2018-1793 affects IBM WebSphere Application Server versions 7.0, 8.0, 8.5, and 9.0 when configured with SAML enterprise archive functionality. This cross-site scripting vulnerability represents a critical security flaw that undermines the integrity of web-based authentication systems. The issue stems from insufficient input validation and output encoding mechanisms within the SAML implementation, allowing malicious actors to inject malicious JavaScript code into web user interfaces. The vulnerability specifically impacts environments where SAML authentication is utilized, making it particularly dangerous for enterprise applications that rely on single sign-on capabilities and federated identity management. Organizations using these IBM WebSphere versions with SAML configurations face significant risks as the flaw can be exploited to manipulate web interfaces and compromise user sessions.
The technical implementation of this vulnerability occurs through improper sanitization of user-supplied input within the SAML processing components of WebSphere Application Server. When SAML assertions are processed and rendered in the web interface, the application fails to adequately encode or escape special characters that could be interpreted as JavaScript code. This lack of proper input validation creates an environment where attackers can craft malicious SAML assertions containing embedded scripts that execute within the context of legitimate user sessions. The vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications, and aligns with ATT&CK technique T1566 related to spearphishing with malicious attachments. The flaw essentially allows an attacker to inject JavaScript code that can manipulate the web page content, potentially redirecting users to malicious sites or stealing session cookies and authentication tokens.
The operational impact of CVE-2018-1793 extends beyond simple script injection, creating serious implications for enterprise security and user data protection. Attackers exploiting this vulnerability can potentially steal session cookies, which would allow them to impersonate legitimate users within the WebSphere environment. The vulnerability is particularly concerning because it operates within trusted session contexts, meaning that compromised credentials could provide access to sensitive enterprise applications and data. This could result in unauthorized access to business-critical systems, data breaches, and potential lateral movement within the network. The attack surface is broad as it affects multiple versions of IBM WebSphere Application Server, making it a significant concern for organizations maintaining legacy systems. Security professionals should note that the vulnerability can be exploited by attackers with minimal privileges, as the flaw exists in the web interface processing rather than requiring elevated system access.
Organizations should implement immediate mitigations including applying the relevant IBM security patches and updates that address this cross-site scripting vulnerability. The recommended approach involves upgrading to IBM WebSphere Application Server versions that contain the necessary security fixes, which typically include enhanced input validation and output encoding mechanisms. Network segmentation and web application firewalls can provide additional protective layers by monitoring and filtering malicious SAML traffic. Security teams should also implement proper input validation controls and ensure that all user-supplied data is properly sanitized before being rendered in web interfaces. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other enterprise applications. The mitigation strategy should align with industry best practices for web application security and incorporate principles from the OWASP Top Ten project, particularly focusing on prevention of cross-site scripting attacks through proper encoding and validation techniques. Organizations must also establish monitoring procedures to detect potential exploitation attempts and maintain detailed audit trails of authentication events within SAML-enabled applications.