#VU77112 Use of insufficiently random values in PHP - CVE-2023-3247

Vulnerability identifier: #VU77112

Vulnerability risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-3247

CWE-ID: CWE-330

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a remote attacker to bypass authentication.

The vulnerability exists due to a missing error check and insufficient random bytes in HTTP Digest authentication for SOAP. A remote attacker can perform a brute-force attack and bypass authentication process.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PHP: 7.4 - 7.4.33, 8.0.0 - 8.0.28, 8.1.0 - 8.1.19, 8.2.0 - 8.2.6

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External links
https://www.php.net/ChangeLog-8.php#8.0.29
https://www.php.net/ChangeLog-8.php#8.1.20
https://www.php.net/ChangeLog-8.php#8.2.7

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.