UNIX symbolic link following in drupal7 (Alpine package)

1) UNIX symbolic link following

EUVDB-ID: #VU49907

Risk: High

CVSSv4.0: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2020-36193

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to a symlink following issue in tar.php file in Archive_Tar. A remote attacker can pass specially crafted archive to the application and force the application to overwrite arbitrary files on the system using directory traversal sequences.

Successful exploitation of the vulnerability may allow an attacker to compromise the affected system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

drupal7 (Alpine package): 7.37-r0 - 7.77-r0

CPE2.3

• cpe:2.3:o:alpine:drupal7_alpine_package:7.37-r0:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:o:alpine:drupal7_alpine_package:7.43-r0:*:*:*:*:alpine_linux:*:3.3
• cpe:2.3:o:alpine:drupal7_alpine_package:7.43-r1:*:*:*:*:alpine_linux:*:3.3

External links

https://git.alpinelinux.org/aports/commit/?id=367118debf534a7ff23b3dad73843d56bcd73b36
https://git.alpinelinux.org/aports/commit/?id=70d5f9c0ad64e64ea22a5dd1a93a62a74dc380dd
https://git.alpinelinux.org/aports/commit/?id=fb8b5ecaf001f88821b8e6cba7157c32c1f64c5f

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.