Vulnerability identifier: #VU16904

Vulnerability risk: Low

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-125

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 cause DoS condition on the target system.

The weakness exists due to out-of-bounds read during a second base64 implementation in ext/xmlrpc/libxmlrpc/base64.c in the PHP code. A remote attacker can supply a bad base64 input, trigger buffer over-read and cause the service to crash.

Mitigation
The vulnerability has been fixed in the versions 5.6.40, 7.1.26, 7.2.14, 7.3.1.

Vulnerable software versions

PHP: 7.2.0 - 7.2.13, 7.3.0 - 7.3.0beta3, 7.1.0 - 7.1.25, 5.6.0 - 5.6.39, 5.5.6

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External links
http://bugs.php.net/bug.php?id=77380

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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. However, proof of concept for this vulnerability is available.