OS Command Injection in pacman (Alpine package)

1) OS Command Injection

EUVDB-ID: #VU22197

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18182

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation within the the download_with_xfercommand() function in src/pacman/conf.c file in pacman. A remote attacker can trick the victim to enable a non-default XferCommand to retrieve an attacker-controlled crafted database and package and execute arbitrary OS commands on the system with privileges of the current user.

Mitigation

Install update from vendor's website.

Vulnerable software versions

pacman (Alpine package): 5.1.3-r0

External links

http://git.alpinelinux.org/aports/commit/?id=740a727614b714f95079f05278e173f5735909d7

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.