CVE-2008-0450 in Blog Cms
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in BLOG:CMS 4.2.1.c allow remote attackers to execute arbitrary PHP code via a URL in the (1) DIR_PLUGINS parameter to (a) index.php, and the (2) DIR_LIBS parameter to (b) media.php and (c) xmlrpc/server.php in admin/.
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Analysis
by VulDB Data Team • 08/22/2017
The vulnerability identified as CVE-2008-0450 represents a critical remote file inclusion flaw within BLOG:CMS version 4.2.1.c that exposes the system to arbitrary code execution attacks. This vulnerability falls under the category of insecure direct object references and improper input validation, creating a pathway for malicious actors to inject and execute unauthorized code on the target server. The flaw manifests through multiple entry points within the application's core files, specifically targeting parameter handling mechanisms that process user-supplied input without adequate sanitization or validation.
The technical implementation of this vulnerability occurs when the application fails to properly validate or sanitize input parameters before using them in file inclusion operations. Attackers can exploit this by manipulating the DIR_PLUGINS parameter in index.php and the DIR_LIBS parameter in media.php and xmlrpc/server.php within the admin directory. When these parameters contain malicious URLs, the application's file inclusion functions treat them as legitimate file paths, leading to the execution of remote code. This represents a classic remote file inclusion vulnerability that aligns with CWE-88, which addresses improper neutralization of special elements used in an expression.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise. An attacker who successfully exploits this vulnerability can gain unauthorized access to the web server, potentially leading to data breaches, system infiltration, and further lateral movement within the network infrastructure. The vulnerability is particularly dangerous because it affects core administrative functions and allows for the execution of arbitrary PHP code, providing attackers with extensive control over the affected system. This type of vulnerability typically maps to attack techniques described in the MITRE ATT&CK framework under T1190 for exploitation of remote services and T1059 for execution through command and scripting interpreters.
The exploitation of this vulnerability requires minimal technical sophistication, making it particularly dangerous in environments where the application is accessible from untrusted networks. The attack vector relies on the application's trust in user-supplied input and its lack of proper input validation mechanisms. Organizations affected by this vulnerability should consider immediate remediation through patching or implementing proper input validation, output encoding, and secure parameter handling practices. The vulnerability demonstrates the critical importance of proper input validation and the principle of least privilege in web application security, as outlined in various cybersecurity frameworks and best practices for secure coding.