CVE-2024-36459 in Symantec SiteMinder
Summary
by MITRE • 06/14/2024
A CRLF cross-site scripting vulnerability has been identified in certain configurations of the SiteMinder Web Agent for IIS Web Server and SiteMinder Web Agent for Domino Web Server. As a result, an attacker can execute arbitrary Javascript code in a client browser.
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Analysis
by VulDB Data Team • 03/23/2025
The vulnerability CVE-2024-36459 represents a critical cross-site scripting flaw that affects the SiteMinder Web Agent implementations on both IIS and Domino web servers. This vulnerability specifically leverages CRLF (Carriage Return Line Feed) injection techniques to bypass security controls and inject malicious javascript code into client browsers. The flaw exists within the web agent's handling of user-supplied input that is processed through HTTP headers, creating an attack surface where malicious actors can manipulate the header processing logic to insert script payloads. The vulnerability is particularly concerning because it affects enterprise-level web security products that are designed to protect against such attacks, creating a paradox where the security mechanism itself becomes a vector for exploitation.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the SiteMinder Web Agent's header processing routines. When user input containing CRLF sequences is processed and inserted into HTTP headers without proper encoding or validation, attackers can inject malicious content that gets executed in the victim's browser context. This type of vulnerability maps directly to CWE-116, which addresses improper encoding or escaping of output data, and specifically relates to CWE-79 which covers cross-site scripting vulnerabilities. The attack typically involves crafting HTTP requests or headers that contain CRLF sequences followed by javascript code, which then gets interpreted by the browser when the malicious content is rendered in the user's session.
The operational impact of this vulnerability extends beyond simple script execution as it can enable sophisticated attack chains including session hijacking, credential theft, and redirection to malicious sites. An attacker exploiting this vulnerability can potentially steal user sessions, modify application behavior, or redirect victims to phishing sites that appear legitimate. The attack requires minimal privileges and can be executed through standard web traffic manipulation, making it particularly dangerous in enterprise environments where SiteMinder agents are deployed to protect sensitive applications and data. The vulnerability affects organizations that rely on these web agents for authentication and authorization, potentially compromising the integrity of their entire web application security infrastructure.
Organizations should implement immediate mitigations including input validation at all entry points, proper header encoding, and deployment of web application firewalls to detect and block CRLF injection attempts. The vulnerability aligns with ATT&CK technique T1566 which covers credential access through social engineering and malicious web content. Security teams should also consider implementing Content Security Policy headers to limit script execution capabilities, and conduct thorough code reviews of all header processing logic within web applications. Additionally, organizations should ensure they are running patched versions of SiteMinder Web Agents as provided by the vendor, and consider network-level monitoring for unusual CRLF sequences in HTTP headers that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation in web security products and highlights the need for comprehensive security testing of authentication mechanisms.