CVE-2005-4550 in Application Server Discussion Forum Portlet
Summary
by MITRE
The PORTAL schema in Oracle Application Server (OracleAS) Discussion Forum Portlet allows remote attackers to obtain the source code for arbitrary JSP and other files via a df_next_page parameter with a trailing null byte (%00).
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Analysis
by VulDB Data Team • 12/15/2024
The vulnerability described in CVE-2005-4550 represents a critical information disclosure flaw within Oracle Application Server's Discussion Forum Portlet component. This vulnerability specifically affects the PORTAL schema implementation and exposes sensitive system information through improper input validation mechanisms. The flaw exists in the handling of the df_next_page parameter, which is utilized within the portlet's navigation and page rendering functionality. Attackers can exploit this weakness by crafting malicious requests that include a trailing null byte character sequence encoded as %00, which allows them to bypass normal access controls and retrieve source code files from the server.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input parameters within the Oracle Application Server environment. When the df_next_page parameter is processed, the system fails to properly validate or sanitize the input before using it to determine file paths or navigation targets. The trailing null byte injection technique exploits a common vulnerability pattern where the null byte character %00 terminates string processing in certain contexts, allowing attackers to manipulate file access routines. This behavior effectively bypasses the intended security boundaries that should prevent unauthorized access to sensitive files, including JSP source code, configuration files, and other potentially sensitive resources stored on the application server.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with access to source code that may contain sensitive business logic, database connection strings, authentication mechanisms, and other proprietary code elements. This exposure creates significant risks for organizations relying on Oracle Application Server, as the retrieved source code could reveal implementation details that facilitate further exploitation attempts. The vulnerability affects the confidentiality aspect of the CIA triad, potentially enabling attackers to gain insights into application architecture and implementation practices. Additionally, the ability to access arbitrary files may allow for privilege escalation or other advanced attack vectors that could compromise the entire application server infrastructure.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization mechanisms within the Oracle Application Server environment. Organizations should immediately apply the relevant Oracle security patches and updates that address this specific flaw in the Discussion Forum Portlet component. Network-level protections such as web application firewalls should be configured to filter out null byte sequences in URL parameters and input fields. Access controls should be strengthened to ensure that only authorized users can access sensitive application components, and the principle of least privilege should be enforced throughout the application server configuration. The vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of how insufficient input sanitization can lead to serious security implications. From an attack perspective, this vulnerability would typically map to techniques in the reconnaissance and initial access phases of the attack lifecycle, as defined by the MITRE ATT&CK framework, potentially enabling subsequent lateral movement or privilege escalation activities.