CVE-2008-2649 in DesktopOnNet
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in DesktopOnNet 3 Beta allow remote attackers to execute arbitrary PHP code via a URL in the app_path parameter to (1) don3_requiem.don3app/don3_requiem.php and (2) frontpage.don3app/frontpage.php.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 10/26/2024
The vulnerability identified as CVE-2008-2649 represents a critical remote file inclusion flaw affecting DesktopOnNet 3 Beta software. This issue stems from improper input validation within the application's handling of user-supplied parameters, specifically the app_path parameter that is processed in two distinct PHP script files. The vulnerability manifests when the application fails to properly sanitize or validate the URL provided in the app_path parameter, creating an opportunity for malicious actors to inject and execute arbitrary PHP code on the target system. This type of vulnerability falls under the category of CWE-88, which describes improper neutralization of special elements used in an OS command, and more specifically aligns with CWE-94, representing improper execution of code due to inadequate input validation. The attack vector operates through the exploitation of insecure parameter handling within the web application's architecture, allowing remote threat actors to leverage this weakness for unauthorized code execution.
The technical implementation of this vulnerability occurs within the context of PHP web applications where user input directly influences file inclusion operations. When the application processes the app_path parameter in don3_requiem.php or frontpage.php, it accepts a URL value that is then used to include additional PHP files. This design pattern creates a dangerous condition where an attacker can manipulate the parameter to reference external malicious PHP scripts hosted on remote servers. The flaw essentially allows for a path traversal or inclusion attack where the application's file inclusion mechanism becomes a conduit for executing attacker-controlled code, bypassing normal application security controls. This vulnerability is particularly concerning because it operates at the application layer and can be exploited without requiring authentication, making it an attractive target for automated exploitation tools and malicious actors seeking to compromise web servers.
The operational impact of this vulnerability extends beyond simple code execution, creating a potential gateway for more sophisticated attacks within the compromised environment. Successful exploitation enables attackers to execute arbitrary commands on the target system, potentially leading to full system compromise, data theft, or establishment of persistent backdoors. From an attacker's perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1059.007 technique for "Command and Scripting Interpreter: PowerShell" and T1190 for "Exploit Public-Facing Application," as it represents a method of exploiting publicly accessible web applications to gain unauthorized access. The vulnerability can be leveraged for reconnaissance activities, privilege escalation, and lateral movement within a network. Organizations running DesktopOnNet 3 Beta are at risk of experiencing unauthorized access, data breaches, and potential service disruption, as the attack can be executed from any location with internet access and knowledge of the vulnerable endpoints.
Mitigation strategies for CVE-2008-2649 require immediate action to address the root cause of the vulnerability through proper input validation and secure coding practices. The primary remediation involves implementing strict input validation on all user-supplied parameters, particularly those used in file inclusion operations, ensuring that only predetermined and trusted values are accepted. Organizations should implement whitelisting mechanisms for the app_path parameter, restricting it to known, safe values rather than accepting arbitrary URLs. Additionally, the application should be configured to disable remote file inclusion capabilities entirely, using PHP's allow_url_include directive set to off, and implementing proper input sanitization techniques such as regular expression validation and parameterized queries. Security hardening measures should include disabling unnecessary PHP functions that could be exploited, implementing web application firewalls to detect and block malicious requests, and conducting regular security assessments to identify similar vulnerabilities within the application's codebase. The implementation of these controls aligns with industry best practices and security standards including the OWASP Top Ten and NIST cybersecurity frameworks, which emphasize the importance of input validation and secure coding practices in preventing remote code execution vulnerabilities.