OS Command Injection in firefox-esr (Alpine package)

1) OS Command Injection

EUVDB-ID: #VU25123

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-2020-6799

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 when opening PDF links from other applications and Firefox is configured as a default PDF reader. A remote unauthenticated attacker can trick the victim into clicking on a specially crafted link and execute arbitrary OS commands on the system.

Note: This issue only affects Windows operating systems and when Firefox is configured as the default handler for non-default filetypes. Other operating systems are unaffected.

Mitigation

Install update from vendor's website.

Vulnerable software versions

firefox-esr (Alpine package): 60.4.0-r0 - 68.4.2-r1

External links

http://git.alpinelinux.org/aports/commit/?id=b3a10d424ad10e10ad565e2270d7aad7019da5cf
http://git.alpinelinux.org/aports/commit/?id=b34b713509404edde6e3bfb92ab656bad2345496

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.