CVE-2023-36306: use $_SERVER['SCRIPT_NAME']#105
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Summary of ChangesHello @PunisherHD92, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a crucial security patch to address CVE-2023-36306, an XSS vulnerability affecting multiple components of Adiscon LogAnalyzer. The change ensures that the application accurately retrieves the script's path, thereby mitigating the risk of malicious code execution through URL manipulation. Highlights
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Code Review
This pull request addresses the Cross-Site Scripting (XSS) vulnerability identified as CVE-2023-36306. The fix involves replacing the vulnerable $_SERVER['PHP_SELF'] superglobal with the safer $_SERVER['SCRIPT_NAME'] in the CreateCurrentUrl() function. This is the correct approach to mitigate this type of XSS attack, as $_SERVER['SCRIPT_NAME'] is not susceptible to path injection. The change is located in a shared function, which ensures the vulnerability is fixed across all the affected components of the application. The patch is correct and effectively resolves the security issue.
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Code Review
This pull request updates the CreateCurrentUrl function to use $_SERVER['SCRIPT_NAME'] instead of $_SERVER['PHP_SELF'] to mitigate XSS risks related to PATH_INFO. However, the reviewer notes that the function remains vulnerable to XSS because it continues to append unsanitized values from $_SERVER['QUERY_STRING'] later in the function, and recommends implementing proper sanitization or escaping for all URL components.
| { | ||
| global $content; | ||
| $content['CURRENTURL'] = $_SERVER['PHP_SELF']; // . "?" . $_SERVER['QUERY_STRING'] | ||
| $content['CURRENTURL'] = $_SERVER['SCRIPT_NAME']; |
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While switching to $_SERVER['SCRIPT_NAME'] mitigates XSS via PATH_INFO (CVE-2023-36306), the CreateCurrentUrl function remains vulnerable to XSS because it subsequently appends unsanitized values from $_SERVER['QUERY_STRING'] (lines 163-211). To fully address the vulnerability, all components of the URL should be properly escaped or sanitized.
References
- All user-controlled input, including server variables like QUERY_STRING, must be sanitized or escaped before being reflected in the output to prevent XSS.
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A Cross Site Scripting (XSS) vulnerability in Adiscon Aiscon LogAnalyzer through 4.1.13 allows a remote attacker to execute arbitrary code via the asktheoracle.php, details.php, index.php, search.php, export.php, reports.php, and statistics.php components.
https://nvd.nist.gov/vuln/detail/CVE-2023-36306