Vulnerability identifier: #VU22478

Vulnerability risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9023

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 gain access to potentially sensitive information.

The vulnerability exists due to a multiple boundary condition within the ext/mbstring/oniguruma/regcomp.c, ext/mbstring/oniguruma/regexec.c, ext/mbstring/oniguruma/regparse.c, ext/mbstring/oniguruma/enc/unicode.c, and ext/mbstring/oniguruma/src/utf32_be.c files when parsing multibyte data in regular expressions. A remote attacker can pass specially crafted input to the application, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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

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External links
http://bugs.php.net/bug.php?id=77370
http://bugs.php.net/bug.php?id=77371
http://bugs.php.net/bug.php?id=77381
http://bugs.php.net/bug.php?id=77382
http://bugs.php.net/bug.php?id=77385
http://bugs.php.net/bug.php?id=77394
http://bugs.php.net/bug.php?id=77418

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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.