#VU47253 Cryptographic issues in PHP - CVE-2020-7069

Vulnerability identifier: #VU47253

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-7069

CWE-ID: CWE-310

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 gain access to sensitive information.

The vulnerability exists due to the openssl_encrypt() function generates a wrong ciphertext and a wrong tag for AES-CCM for a 12 bytes IV. As a result, a 7-byte nonce is used instead of 12 bytes. A remote attacker can abuse such behavior and decrypt data.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PHP: 7.2 - 7.2.33, 7.3 - 7.3.22, 7.4 - 7.4.10

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External links
https://www.php.net/ChangeLog-7.php#7.4.11
https://bugs.php.net/bug.php?id=79601

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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.