CVE-2008-2138 in Application Server Portal
Summary
by MITRE
Oracle Application Server (OracleAS) Portal 10g allows remote attackers to bypass intended access restrictions and read the contents of /dav_portal/portal/ by sending a request containing a trailing "%0A" (encoded line feed), then using the session ID that is generated from that request. NOTE: as of 20080512, Oracle has not commented on the accuracy of this report.
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Analysis
by VulDB Data Team • 02/03/2025
This vulnerability exists within Oracle Application Server Portal version 10g, representing a significant access control flaw that enables remote attackers to circumvent intended security restrictions. The vulnerability specifically targets the portal's handling of HTTP requests containing specially crafted trailing characters, creating a pathway for unauthorized information disclosure. The attack exploits a weakness in the server's request processing logic where the presence of a trailing "%0A" character sequence triggers an unexpected behavior in the access control mechanisms. This particular vulnerability falls under the category of improper access control as defined by CWE-285, where the system fails to properly enforce authorization checks for resources that should be protected from unauthorized access. The affected component is the DAV portal functionality which handles web-based content management and access control.
The technical exploitation mechanism involves sending a crafted HTTP request that includes a trailing line feed character encoded as "%0A" followed by a request to access the /dav_portal/portal/ directory. When the server processes this malformed request, it generates a session ID that grants access to restricted content. This behavior demonstrates a classic case of input validation failure where the server does not properly sanitize or validate the request parameters before proceeding with access control decisions. The vulnerability essentially allows an attacker to manipulate the session management process by injecting specific character sequences that alter the server's interpretation of the request. This technique represents a form of HTTP parameter pollution or request manipulation that can be classified under ATT&CK technique T1071.004 for application layer protocol manipulation. The vulnerability's exploitation does not require authentication initially, making it particularly dangerous as it allows for reconnaissance and information gathering without prior access credentials.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the ability to access sensitive portal content that should be protected from unauthorized users. The compromised directory structure suggests that attackers could potentially access portal configuration files, user data, or other sensitive resources stored within the DAV portal system. This access could lead to further exploitation opportunities including privilege escalation, data theft, or the ability to modify portal content. The vulnerability's remote nature means that attackers do not require physical access to the network or system, making it particularly dangerous in enterprise environments where such systems are exposed to external networks. Organizations using Oracle Application Server Portal 10g would be vulnerable to this attack, potentially exposing critical business information and undermining the security posture of their portal infrastructure. The lack of official confirmation from Oracle as of the reported date suggests that this vulnerability may have remained unpatched for an extended period, increasing the risk to affected organizations.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the Oracle Application Server Portal implementation. Organizations should consider applying the latest security patches and updates provided by Oracle as soon as they become available, since this vulnerability represents a clear access control failure that could be exploited for significant damage. Network segmentation and access controls should be implemented to limit exposure of the affected portal systems to untrusted networks. Additionally, monitoring and logging should be enhanced to detect unusual request patterns that might indicate exploitation attempts. The implementation of web application firewalls and intrusion detection systems can help identify and block requests containing the specific malicious character sequences that trigger this vulnerability. Security teams should also conduct regular vulnerability assessments to identify similar input validation issues within the application stack. This vulnerability serves as a reminder of the importance of proper request handling and session management in web applications, particularly in enterprise portal systems where access control is paramount. Organizations should also consider implementing additional layers of security including authentication controls and authorization checks that operate independently of the vulnerable request processing logic. The vulnerability demonstrates the critical need for comprehensive security testing including penetration testing and code reviews to identify access control flaws before they can be exploited by malicious actors.