CVE-2009-2823 in Mac OS X
Summary
by MITRE
The Apache HTTP Server in Apple Mac OS X before 10.6.2 enables the HTTP TRACE method, which allows remote attackers to conduct cross-site scripting (XSS) attacks via unspecified web client software.
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Analysis
by VulDB Data Team • 06/02/2025
The vulnerability identified as CVE-2009-2823 represents a critical security flaw in the Apache HTTP Server implementation within Apple Mac OS X operating systems. This issue stems from the server's default configuration that permits the HTTP TRACE method, a feature that was originally designed for debugging purposes but has been widely recognized as a potential security risk. The vulnerability affects all versions of Mac OS X prior to 10.6.2, creating a window of exposure where malicious actors could exploit this configuration to compromise web applications and user sessions.
The technical root cause of this vulnerability lies in the HTTP TRACE method's ability to reflect client requests back to the server, which when combined with the server's permissive configuration, creates an avenue for cross-site scripting attacks. The TRACE method allows an attacker to send a request that gets echoed back by the server, potentially enabling the injection of malicious scripts into web pages viewed by users. This particular flaw demonstrates a classic security misconfiguration where a debugging feature was left enabled in a production environment without proper security considerations. The vulnerability maps directly to CWE-116, which addresses the improper encoding or escaping of output, and specifically relates to CWE-79, which covers cross-site scripting vulnerabilities.
The operational impact of this vulnerability extends beyond simple web application compromise, as it provides attackers with a means to execute malicious code within the context of a user's browser session. When combined with other attack vectors, particularly those involving social engineering, attackers can leverage this vulnerability to steal session cookies, redirect users to malicious sites, or inject harmful content into web applications. The risk is particularly elevated in environments where users interact with untrusted web content or where the server hosts sensitive applications that could be targeted by such attacks. This vulnerability also aligns with ATT&CK technique T1211, which involves exploiting a command and control channel to establish persistent access, as the TRACE method can be used to create covert communication channels.
Mitigation strategies for this vulnerability involve immediate configuration changes to disable the TRACE method on affected Apache servers within Mac OS X environments. System administrators should implement the directive 'TraceEnable off' within their Apache configuration files to prevent the server from processing TRACE requests. Additionally, organizations should ensure their Mac OS X systems are updated to version 10.6.2 or later, where Apple addressed this vulnerability through system updates. Network administrators should also consider implementing web application firewalls that can detect and block TRACE method requests, and security teams should conduct regular audits to ensure that debugging features are disabled in production environments. The broader security community should recognize this vulnerability as an example of how default configurations can create security risks, emphasizing the importance of security hardening practices and regular vulnerability assessments to prevent similar issues from occurring in other software components.