Input validation error in php7 (Alpine package)

1) Input validation error

EUVDB-ID: #VU26257

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-7066

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to get_headers() PHP function silently truncates headers after receiving a NULL byte character. A remote attacker can abuse this behavior to bypass implemented security restrictions with in the application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.2.5-r0 - 7.2.27-r0

CPE2.3

• cpe:2.3:o:alpine:php7_alpine_package:7.2.5-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:o:alpine:php7_alpine_package:7.2.6-r0:*:*:*:*:alpine_linux:*:3.7
• cpe:2.3:o:alpine:php7_alpine_package:7.2.7-r0:*:*:*:*:alpine_linux:*:3.7

External links

https://git.alpinelinux.org/aports/commit/?id=88b6599af086a66070987236b518ccb5d5247aae
https://git.alpinelinux.org/aports/commit/?id=a12cce1e8e22a09bd37b01b17c6be3e1e7dc46d6
https://git.alpinelinux.org/aports/commit/?id=21a3c8982ee0931e3b842bfeb4f45191fa6769ee

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.