Use-after-free in php7 (Alpine package)

1) Use-after-free

EUVDB-ID: #VU34121

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-7068

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in the "phar_parse_zipfile" function. A remote attacker can can cause a denial of service (DoS) condition on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.2.5-r0 - 7.2.31-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=d8ca1836b9174a8a8129267750c273a8cde492ce
https://git.alpinelinux.org/aports/commit/?id=b2b6f289a8b925f26b26882e7366502bb07f23ce

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.