CVE-2022-31630 : What You Need to Know
Learn about CVE-2022-31630 impacting PHP versions prior to 7.4.33, 8.0.25, and 8.2.12. Discover the vulnerability, its impact, affected systems, and mitigation steps.
PHP versions prior to 7.4.33, 8.0.25, and 8.2.12 are vulnerable to an out-of-bounds read (OOB) due to insufficient input validation in the imageloadfont() function in the gd extension. An attacker could exploit this vulnerability by supplying a specially crafted font file, leading to crashes or disclosure of confidential information.
Understanding CVE-2022-31630
This CVE identifies a security vulnerability in PHP related to the imageloadfont() function in the gd extension, impacting versions before 7.4.33, 8.0.25, and 8.2.12.
What is CVE-2022-31630?
In PHP versions prior to 7.4.33, 8.0.25, and 8.2.12, the vulnerability arises from insufficient input validation in the imageloadfont() function within the gd extension. This can be exploited by providing a specially crafted font file to potentially cause system crashes or expose sensitive data.
The Impact of CVE-2022-31630
The impact of this CVE, identified as CAPEC-540 Overread Buffers, can result in unauthorized read access that may compromise system integrity and confidentiality.
Technical Details of CVE-2022-31630
Vulnerability Description
The vulnerability allows an attacker to trigger an out-of-bounds read by using a manipulated font file, potentially leading to the exposure of restricted information.
Affected Systems and Versions
PHP versions before 7.4.33, 8.0.25, and 8.2.12 utilizing the imageloadfont() function in the gd extension are susceptible to this vulnerability.
Exploitation Mechanism
By supplying a specially crafted font file to the imageloadfont() function, an attacker can trigger the OOB read, exploiting the lack of proper input validation.
Mitigation and Prevention
Immediate Steps to Take
Users are advised to update their PHP installations to versions 7.4.33, 8.0.25, or 8.2.12 to mitigate the vulnerability introduced in earlier versions.
Long-Term Security Practices
Maintaining up-to-date software versions and conducting regular security assessments can prevent potential exploits and enhance system security.
Patching and Updates
Regularly implementing security patches provided by PHP Group is crucial to address known vulnerabilities and strengthen system defenses.