CVE-2016-9990 in iNotes
Summary
by MITRE
IBM iNotes 8.5 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 #: 1998824.
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Analysis
by VulDB Data Team • 11/22/2022
The vulnerability identified as CVE-2016-9990 affects IBM iNotes versions 8.5 and 9.0, representing a critical cross-site scripting flaw that undermines the security posture of the web-based email and collaboration platform. This vulnerability resides within the web user interface of the application, where insufficient input validation and output encoding mechanisms fail to properly sanitize user-supplied data before rendering it in the browser context. The flaw specifically manifests when the application processes and displays user-provided content without adequate sanitization, creating an opening for malicious actors to inject malicious JavaScript code that executes within the context of authenticated sessions.
The technical exploitation of this vulnerability follows the typical XSS attack pattern where an attacker crafts malicious input containing JavaScript payloads that are then rendered in the web interface. When a victim accesses the compromised page, the embedded script executes in their browser session, potentially compromising the integrity of the application's intended functionality. The vulnerability's classification aligns with CWE-79, which specifically addresses cross-site scripting flaws, and falls under the broader category of web application security weaknesses that enable attackers to manipulate the behavior of web applications. The attack vector is particularly dangerous because it leverages the trust relationship between the user and the application, allowing the malicious code to operate within the context of a legitimate session.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to steal session cookies, credentials, and other sensitive information from authenticated users. When an attacker successfully injects JavaScript code into the iNotes interface, they can potentially capture user credentials, access email contents, modify user settings, or even escalate privileges within the application. The vulnerability's presence in both versions 8.5 and 9.0 indicates a persistent flaw in the application's security architecture, affecting a significant portion of IBM iNotes deployments and creating widespread exposure across organizations relying on these versions. This type of vulnerability directly violates the principle of least privilege and can lead to complete compromise of user accounts and potentially the underlying system infrastructure.
Mitigation strategies for CVE-2016-9990 should prioritize immediate patch application from IBM, as the vendor has provided specific fixes for this vulnerability through their security advisories. Organizations should implement comprehensive input validation and output encoding mechanisms that sanitize all user-supplied data before processing, ensuring that any potentially malicious content is neutralized before rendering in the web interface. The implementation of Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Security teams should also consider deploying web application firewalls that can detect and block malicious script injection attempts, while regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in the application's codebase. The vulnerability's classification under ATT&CK technique T1059.007 for scripting languages demonstrates the attack's alignment with established threat frameworks, emphasizing the need for comprehensive defensive measures that address both the immediate vulnerability and broader application security weaknesses.