In PHP versions 8.1.* before 8.1.30, 8.2.* before 8.2.24, and 8.3.* before 8.3.12, the HTTP_REDIRECT_STATUS variable is used to check whether or not the CGI binary is being run by the HTTP server. However, due to certain scenarios where the content of this variable can be controlled by the request submitter via HTTP headers, the cgi.force_redirect option may not be correctly applied. This misconfiguration could lead to arbitrary file inclusion in PHP.
The vulnerability, classified as high severity with a CVSS score of 7.5, poses significant risk to organizations utilizing the affected PHP versions. Organizations should prioritize patching immediately to mitigate potential exploitation.
Risk to organizations includes unauthorized access to sensitive files, which can compromise the confidentiality of data and lead to broader security implications.
Currently, there are no known exploits for this vulnerability in the wild, but the potential for exploitation remains high due to the nature of the flaw.
To ensure security, organizations are advised to schedule remediation as part of their priority patch cycle and monitor updates from PHP regarding this vulnerability.
Vulnerability Details
The vulnerability allows for arbitrary file inclusion due to a misconfiguration in the handling of the HTTP_REDIRECT_STATUS variable. The affected versions include PHP 8.1.* prior to 8.1.30, 8.2.* prior to 8.2.24, and 8.3.* prior to 8.3.12. The vulnerability has a CVSS score of 7.5, indicating a high severity level.
The attack vector for this vulnerability is network-based, with low attack complexity and no privileges required for exploitation. User interaction is not necessary, making it easier for an attacker to exploit this vulnerability remotely.
The potential impacts include a high confidentiality impact, with no integrity or availability impacts reported.
Technical Analysis
The root cause of the vulnerability lies in the improper handling of the HTTP_REDIRECT_STATUS variable, which can be influenced by HTTP headers sent by users. This leads to a failure in enforcing the cgi.force_redirect option, allowing potential attackers to include arbitrary files.
This vulnerability can be exploited through network access, making it imperative for organizations to secure their PHP configurations and validate their settings.
Risk & Impact Analysis
The real-world risk of this vulnerability is significant, as it could lead to unauthorized file access and potential data breaches. Organizations that deploy affected versions of PHP may face exposure if this vulnerability is exploited.
The blast radius could affect sensitive data and system integrity, emphasizing the importance of remediation. Given the CVSS score of 7.5, organizations should prioritize patching immediately.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include PHP 8.1.* prior to 8.1.30, 8.2.* prior to 8.2.24, and 8.3.* prior to 8.3.12. Organizations should apply updates to the latest version as soon as possible to mitigate risks.
Mitigation & Remediation
Organizations should update affected PHP versions to the latest releases to eliminate this vulnerability. Ensure that configurations are validated post-update to confirm proper application of the cgi.force_redirect option. Regular security assessments and security testing can help identify similar weaknesses in configurations.
Detection Guidance
Organizations should monitor for unusual HTTP headers that may affect the HTTP_REDIRECT_STATUS variable. Implement logging to detect unauthorized access attempts and monitor file access patterns that may indicate exploitation.
AppSecure Threat Intelligence Insight
This vulnerability underscores the ongoing need for secure coding practices in PHP development. As organizations increasingly rely on web technologies, the potential for similar vulnerabilities highlights the importance of regular security assessments. Security teams should continually evaluate their configurations and patch management processes.
For further guidance on securing PHP applications, organizations can refer to resources on penetration testing and consider implementing a comprehensive vulnerability management program to proactively address future risks.
By adopting these strategies, organizations can enhance their security posture and reduce the likelihood of exploitation of similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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