CVE-2018-13379

CVE-2018-13379 is a critical-severity (CVSS 9.1) vulnerability in Fortinet FortiOS. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Fortinet has 32 vulnerabilities in the KEV catalog, 14 of them linked to ransomware.

An Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal") in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 and 5.4.6 to 5.4.12 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 under SSL VPN web portal allows an unauthenticated attacker to download system files via special crafted HTTP resource requests.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

• https://fortiguard.com/advisory/FG-IR-18-384
• https://www.fortiguard.com/psirt/FG-IR-20-233
• https://fortiguard.com/advisory/FG-IR-18-384
• https://www.fortiguard.com/psirt/FG-IR-20-233
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13379