In PHP versions 8.1.* before 8.1.30, 8.2.* before 8.2.24, and 8.3.* before 8.3.12, a vulnerability exists when using PHP-FPM SAPI configured to catch workers output. This vulnerability allows for potential pollution of the final log or removal of up to 4 characters from log messages through manipulation of log message content. Additionally, if PHP-FPM is configured to use syslog output, further removal of log data is possible.
The severity of this vulnerability is classified as low, with a CVSS score of 3.3, indicating that while it poses some risk, the likelihood of exploitation is limited. Organizations using the affected versions should be aware of this potential risk, particularly in environments where log integrity is critical.
As of now, there are no known exploits or proof of concept (PoC) publicly available for this vulnerability. However, it is essential for organizations to prioritize patching as part of their security practices, especially when dealing with logging mechanisms that could impact the integrity of applications.
Organizations should address this vulnerability in their patch management cycles, as failure to do so may lead to compromised log integrity which can obscure the detection of malicious activities.
Organizations should prioritize patching immediately.
Vulnerability Details
This vulnerability allows for the manipulation of log messages in PHP versions 8.1.* before 8.1.30, 8.2.* before 8.2.24, and 8.3.* before 8.3.12, when using PHP-FPM SAPI configured to catch workers output. The CVSS score of 3.3 indicates a low severity, with the potential impact focused on the integrity of log data.
Affected systems include PHP versions within the specified ranges. The issue is classified under CWE-117 (Improper Output Neutralization for Logs) and CWE-158 (Using Libraries with Known Vulnerabilities).
The vulnerability was published on October 8, 2024, and is currently listed as modified.
Technical Analysis
The root cause of this vulnerability stems from how PHP-FPM handles log message outputs. If configured improperly, it allows for log message content to be manipulated, which could lead to integrity issues in the logs. The attack vector is local, meaning that an attacker would need local access to the system to exploit this issue.
The complexity of the attack is low, requiring minimal skill to execute. Privileges required to exploit this vulnerability are low, meaning that standard users with access to the PHP-FPM configuration could potentially manipulate log outputs. User interaction is not required, as the attack can occur without any user involvement.
From an impact perspective, the confidentiality impact is none, while the integrity impact is low. There is no availability impact associated with this vulnerability.
Risk & Impact Analysis
Risk to organizations includes potential manipulation of log messages, which can obscure audit trails and hinder incident response efforts. The low severity of this vulnerability suggests that while the risk is present, it may not be a priority compared to higher-severity vulnerabilities.
However, the potential for log pollution can have cascading effects, especially in environments where logging is critical for compliance or operational integrity. Organizations should assess their specific deployment scenarios to determine the relevance of this vulnerability.
Given the CVSS score of 3.3, organizations should schedule remediation of this vulnerability in their patch management lifecycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of PHP include 8.1.* before 8.1.30, 8.2.* before 8.2.24, and 8.3.* before 8.3.12. Organizations should ensure they are using patched versions to mitigate this risk.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to PHP versions 8.1.30, 8.2.24, or 8.3.12 or later. If immediate upgrading is not feasible, evaluate configurations for PHP-FPM and consider alternative logging mechanisms to ensure log integrity.
For further guidance on security practices, organizations can consider incorporating application security assessments into their routine security evaluations.
Detection Guidance
To detect potential exploitation of this vulnerability, monitor logs for anomalies in message content, especially if the logging mechanism is configured to alter output. Look for unexpected log entries or characters that appear to be truncated.
Regular audits of logging practices and configurations can help identify misconfigurations that may lead to log manipulation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2024-9026 highlights a critical focus on log integrity within PHP applications. As organizations become increasingly reliant on logging for compliance and operational transparency, the implications of log manipulation grow more severe.
This vulnerability represents a broader trend of vulnerabilities arising from misconfigurations in widely used software components. Security teams should prioritize understanding the attack surface and ensuring configurations align with security best practices.
For comprehensive security evaluations, teams may refer to the following resources: penetration testing methodology, vulnerability management program design, and API penetration testing best practices to strengthen their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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