SB2020021189 - OS Command Injection in firefox-esr (Alpine package)

Description

This security bulletin contains information about 1 vulnerability.

1) OS Command Injection (CVE-ID: CVE-2020-6799)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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.

Remediation

Install update from vendor's website.

References

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