CVE-2022-31626 is a high-severity vulnerability found in PHP versions 7.4.x below 7.4.30, 8.0.x below 8.0.20, and 8.1.x below 8.1.7. This vulnerability allows for a remote code execution (RCE) attack when the pdo_mysql extension with the mysqlnd driver is used. If a third party is allowed to supply both the host and the password for the connection, an excessively long password can trigger a buffer overflow in PHP, leading to malicious exploitability.
The CVSS score for this vulnerability is 7.5, indicating a high severity level. The attack vector is network-based, and while the attack complexity is rated as high, the privileges required to exploit the vulnerability are low, with no user interaction necessary. This combination of factors means that organizations must take this vulnerability seriously, as the risk to their systems includes potential unauthorized access and severe data breaches.
Given the potential for exploitation, organizations using the vulnerable versions of PHP should prioritize patching immediately. The urgency is underscored by the fact that this vulnerability is already known in the security community, and attackers may leverage it if not mitigated.
Notably, the vulnerability was published on June 16, 2022, and continues to be relevant as it affects widely used PHP versions. Security teams must ensure that their systems are updated to prevent potential exploitation.
Vulnerability Details
The official description states: 'In PHP versions 7.4.x below 7.4.30, 8.0.x below 8.0.20, and 8.1.x below 8.1.7, when pdo_mysql extension with mysqlnd driver, if the third party is allowed to supply host to connect to and the password for the connection, password of excessive length can trigger a buffer overflow in PHP, which can lead to a remote code execution vulnerability.'
This vulnerability is classified under CWE-120, indicating a buffer copy without checking the size of the input. The CVSS score from the NVD is 8.8, reflecting a critical risk level due to its potential impact on confidentiality, integrity, and availability.
Technical Analysis
The root cause of CVE-2022-31626 lies in the handling of input by the pdo_mysql extension, specifically when it allows third parties to supply connection credentials. An attacker can exploit this by providing a password that exceeds the buffer size allocated by the application, leading to a buffer overflow. This flaw can be exploited over the network, leveraging low privileges due to the nature of the vulnerability.
The attack complexity is rated as high, meaning that while an attacker can exploit the vulnerability, it requires a certain level of sophistication and access to the application. Importantly, no user interaction is required for the exploit to succeed.
As for the impact, if successfully exploited, the confidentiality, integrity, and availability of the affected system could be severely compromised. Attackers may gain unauthorized access to sensitive data, alter system operations, or disrupt service availability.
Risk & Impact Analysis
The real-world risk associated with CVE-2022-31626 is significant given its potential for remote code execution. Organizations that deploy affected versions of PHP may find themselves at risk of unauthorized access, data breaches, and potential compliance violations.
The blast radius for this vulnerability is extensive, particularly for organizations relying heavily on PHP for web applications. The ability to remotely execute code could lead to a complete system compromise, making it imperative for organizations to address this vulnerability promptly.
Based on the CVSS score and the urgency of the threat, organizations should address this vulnerability in their priority patch cycle. The high exploitability score suggests that attackers might already be developing methods to exploit this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions include PHP 7.4.x prior to 7.4.30, 8.0.x prior to 8.0.20, and 8.1.x prior to 8.1.7. Additionally, Debian Linux versions 10.0 and 11.0 are affected. Organizations should ensure that they upgrade to the latest versions to mitigate this risk.
Mitigation & Remediation
Organizations should prioritize patching to versions 7.4.30, 8.0.20, and 8.1.7 or later. If immediate patching is not feasible, consider implementing workarounds such as restricting third-party access to the pdo_mysql extension or validating input lengths to prevent excessive buffer inputs.
Ultimately, staying informed about vulnerabilities like CVE-2022-31626 and implementing best practices can help organizations mitigate risks and safeguard their systems against potential attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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