CVE-2006-5135 in A-Blog
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in A-Blog 2 allow remote attackers to execute arbitrary PHP code via a URL in the (1) open_box, (2) middle_box, and (3) close_box parameters in (a) sources/myaccount.php; the (4) navigation_end parameter in (b) navigation/search.php and (c) navigation/donation.php; and the (6) navigation_start and (7) navigation_middle parameters in navigation/donation.php, (d) navigation/latestnews.php, and (e) navigation/links.php; different vectors than CVE-2006-5092.
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Analysis
by VulDB Data Team • 04/23/2026
The vulnerability described in CVE-2006-5135 represents a critical remote file inclusion flaw affecting A-Blog 2 software, specifically targeting multiple PHP include functions that process user-supplied input without proper validation. This vulnerability falls under the category of CWE-98, which describes improper input validation leading to remote file inclusion attacks, and aligns with ATT&CK technique T1190 for exploiting vulnerabilities in web applications. The flaw exists in the software's handling of parameters within several navigation and account management scripts, creating multiple attack vectors that allow remote attackers to inject malicious URLs into the application's include mechanism.
The technical implementation of this vulnerability stems from the application's failure to sanitize user input before incorporating it into PHP include statements. When the application processes parameters such as open_box, middle_box, close_box, navigation_end, navigation_start, and navigation_middle, it directly uses these values in include or require operations without proper validation or sanitization. This creates an environment where attackers can inject URLs pointing to malicious PHP scripts hosted on remote servers, effectively allowing them to execute arbitrary code on the target system with the privileges of the web server process.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with complete remote code execution capabilities on the affected server. Successful exploitation could lead to full system compromise, data theft, privilege escalation, and potential lateral movement within the network. The vulnerability affects multiple files including sources/myaccount.php, navigation/search.php, navigation/donation.php, navigation/latestnews.php, and navigation/links.php, creating a broad attack surface that increases the likelihood of successful exploitation. The different attack vectors mentioned in the CVE description indicate that the vulnerability is not limited to a single entry point but spans across multiple components of the application.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and sanitization across all user-supplied parameters that are used in include operations. Organizations should immediately apply the vendor's patch or upgrade to a version that addresses this vulnerability. Additionally, implementing web application firewalls with rules to block suspicious include patterns and configuring PHP settings to disable remote file inclusion using the allow_url_include directive can provide additional protection layers. The remediation process should also include reviewing all include operations throughout the application codebase to ensure similar vulnerabilities do not exist elsewhere, aligning with ATT&CK technique T1566 for credential access and T1071 for application layer protocol usage. Regular security audits and input validation testing should be implemented to prevent similar vulnerabilities from being introduced in future development cycles, as this vulnerability demonstrates the critical importance of proper input handling in web applications.