Home/CVE/Fortinet FortiOS SSL VPN Path Traversal Vulnerability
CVE

CVE-2018-13379

Fortinet FortiOS SSL VPN Path Traversal Vulnerability

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.

CRITICAL · CVSS 9.1 ⚠ CISA KEV EPSS 0.94473 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

11
actorAgrius
actorAPT29
actorAPT35
actorCotton Sandstorm
actorDragonfly
actorIndrik Spider
⬡

Weakness Classification

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
▤

Affected Products & Versions

5
fortinet fortiproxy< 1.2.9
fortinet fortiproxyall versions
fortinet fortios>= 5.4.6 and < 5.4.13
fortinet fortios>= 5.6.3 and < 5.6.8
fortinet fortios>= 6.0.0 and < 6.0.5
⚠

Public Exploits & PoCs

3
webappsFortinet FortiOS 5.6.3 - 5.6.7 / FortiOS 6.0.0 - 6.0.4 - Credentials Disclosure2019-08-19
webappsFortinet FortiOS 5.6.3 - 5.6.7 / FortiOS 6.0.0 - 6.0.4 - Credentials Disclosure (Metasploit)2019-08-19
nucleiFortinet FortiOS - Credentials Disclosurecritical
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT Fortinet FortiOS/FortiProxy SSL VPN Web Portal Path Traversal (CVE-2018-13379)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalBitbucket Unauthorized Full Data Export Triggered
relatedcriticalBitbucket Unauthorized Access To A Resource
relatedcriticalAntivirus Exploitation Framework Detection
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalAntivirus Ransomware Detection
relatedcriticalWebshell Remote Command Execution
▣

Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · psirt@fortinet.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Jun 2019 · 09:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
cisaKEV-CVE-2018-13379
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://fortiguard.com/advisory/FG-IR-18-384MitigationVendor Advisory
https://www.fortiguard.com/psirt/FG-IR-20-233Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13379US Government Resource
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