CVE-2023-26044 is a medium-severity denial-of-service vulnerability in the ReactPHP HTTP component. This vulnerability allows high CPU load when processing large HTTP request bodies, especially when using the RequestBodyBufferMiddleware with large settings. While the default configuration is generally unaffected, the potential for exploitation exists, leading to delays in processing legitimate user requests.
With a CVSS score of 5.3, this vulnerability falls into the medium severity category, indicating a noteworthy risk to applications utilizing the ReactPHP framework. Organizations should prioritize addressing this issue to avoid performance degradation caused by excessive resource consumption.
The vulnerability was published on May 17, 2023, and has been modified since its disclosure. Users are strongly advised to upgrade to version 1.9.0 of the ReactPHP HTTP component to mitigate the risk associated with this vulnerability. Users unable to upgrade can limit request body sizes using reasonable settings within the RequestBodyBufferMiddleware.
Additionally, implementing a reverse proxy in front of the ReactPHP HTTP server could serve as an effective workaround to filter out excessive HTTP request bodies and protect against potential denial-of-service conditions.
Vulnerability Details
The official description states that previous versions of ReactPHP's HTTP server component contain a potential DoS vulnerability that can cause high CPU load when processing large HTTP request bodies. Specifically, this issue is relevant when the RequestBodyBufferMiddleware is configured with very large settings.
The vulnerability has been classified under CWE-400, which refers to 'Uncontrolled Resource Consumption'. The attack vector is categorized as 'NETWORK', with a low attack complexity and no privileges required for exploitation.
The CVSS vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L, indicating a low likelihood of exploitation under normal circumstances.
Technical Analysis
The root cause of this vulnerability lies in the handling of large HTTP request bodies within the ReactPHP HTTP server component. When configured improperly, it can lead to excessive CPU consumption, potentially resulting in service degradation.
The attack vector is network-based, meaning that an attacker could exploit this vulnerability remotely without any physical access to the server. The attack complexity is low, as it does not require any special conditions or privileges.
No user interaction is required to exploit this vulnerability, allowing attackers to initiate denial-of-service conditions with minimal effort. The impact on availability is significant, with potential service interruptions due to high CPU load.
Risk & Impact Analysis
Risk to organizations includes potential service outages and degraded performance for legitimate users. The blast radius of this vulnerability can be substantial, particularly for applications that rely heavily on the ReactPHP HTTP component for handling requests.
Given the medium CVSS score, organizations should address this vulnerability in their patch cycle. The urgency for remediation is moderate, as while the default configuration is less affected, organizations should not overlook the potential risks of misconfigured settings.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the ReactPHP HTTP component are those from 0.8.0 up to, but not including, 1.9.0. Organizations using these versions should apply the necessary updates to mitigate the risk of this vulnerability.
Mitigation & Remediation
To mitigate this issue, users should upgrade to version 1.9.0 of the ReactPHP HTTP component. For those unable to upgrade, it is recommended to configure the RequestBodyBufferMiddleware with a sensible limit on request sizes.
Additionally, placing a reverse proxy in front of the ReactPHP HTTP server can help filter excessive HTTP request bodies, providing an extra layer of defense against potential DoS conditions.
Organizations should validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor for unusual CPU usage spikes on servers running the ReactPHP HTTP component. Additionally, log indicators should include request sizes and the response times of the server.
Behavioral anomalies in traffic patterns, such as sudden increases in requests with large bodies, can also serve as crucial indicators of attempted exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-26044 lies in its reflection of the challenges associated with resource management in web applications. As applications become increasingly complex, the potential for misconfiguration and resource exhaustion will continue to be a concern for security teams.
This vulnerability highlights the need for robust monitoring and proactive management of application resources, particularly in environments where large data processing is common.
Organizations are encouraged to adopt strategies such as vulnerability management programs that incorporate continuous monitoring for configuration anomalies and resource consumption patterns.
For those using ReactPHP, it may also be beneficial to explore cloud penetration testing methodologies to uncover potential weaknesses in their infrastructure.
Ultimately, staying informed about emerging vulnerabilities and adopting a proactive stance towards application security will enhance the resilience of organizational infrastructures.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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