NULL pointer dereference in php7 (Alpine package)

1) NULL pointer dereference

EUVDB-ID: #VU25594

Risk: Medium

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

CVE-ID: CVE-2020-7062

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in session.c when handling file uploads. A remote attacker can send a specially crafted HTTP POST request to the affected application and perform a denial of service (DoS) attack.

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=9537881a1d26ea3b5f6ab04ca3065f14e2aef192
https://git.alpinelinux.org/aports/commit/?id=3d3e3c93ca209e263118a19505858c5c99dff6c8

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.