CVE-2016-8581 in OSSIM
Summary
by MITRE
A persistent XSS vulnerability exists in the User-Agent header of the login process of AlienVault OSSIM and USM before 5.3.2 that allows an attacker to steal session IDs of logged in users when the current sessions are viewed by an administrator.
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Analysis
by VulDB Data Team • 01/27/2025
The vulnerability identified as CVE-2016-8581 represents a critical persistent cross-site scripting flaw within the AlienVault OSSIM and USM platforms prior to version 5.3.2. This security weakness specifically targets the user-agent header processing during the authentication workflow, creating a persistent threat vector that can be exploited by malicious actors to compromise user sessions. The vulnerability stems from inadequate input validation and sanitization mechanisms within the web application's session management system, particularly when administrators review active user sessions through the administrative interface.
The technical exploitation of this vulnerability occurs through manipulation of the User-Agent header field during the login process. When an attacker crafts a malicious User-Agent string containing XSS payload code, this input is not properly sanitized before being rendered in the administrator's session management view. The persistent nature of this vulnerability means that the malicious script executes every time the affected administrative interface is accessed, allowing attackers to inject malicious code that can capture session cookies, user credentials, or perform other unauthorized actions. This flaw directly violates the principle of input sanitization and proper output encoding, which are fundamental security practices to prevent cross-site scripting attacks.
The operational impact of CVE-2016-8581 is severe and multifaceted, particularly within security monitoring environments where AlienVault platforms are deployed. Attackers can leverage this vulnerability to steal active user sessions, effectively gaining unauthorized access to the security platform's administrative functions. This compromise enables attackers to manipulate security events, modify configuration settings, access sensitive logs, and potentially exfiltrate data from the monitored network infrastructure. The vulnerability affects the core security functionality of the platform, undermining the trust model that security administrators rely upon when managing their network monitoring systems. When administrators view active sessions through the console, they inadvertently execute the attacker's malicious code, creating a persistent backdoor within the security infrastructure itself.
This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates poor input validation practices that violate the principle of least privilege in security architecture. The ATT&CK framework categorizes this as a technique for privilege escalation through session hijacking, where attackers exploit weaknesses in session management to gain elevated access rights. Organizations utilizing AlienVault platforms must implement immediate mitigations including patching to version 5.3.2 or later, implementing web application firewalls to filter malicious User-Agent headers, and conducting thorough security assessments of their monitoring infrastructure. The vulnerability also highlights the importance of proper security testing during development cycles and the need for comprehensive input validation across all user-controllable data fields in web applications, particularly those within administrative interfaces where sensitive operations occur.