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CVE-2018-13379

Fortinet FortiOS SSL VPN Path Traversal

9.1 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 100.0%
  1. Published4 Jun 2019
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

Fortinet FortiOS SSL VPN web portal contains a path traversal vulnerability that may allow an unauthenticated attacker to download FortiOS system files through specially crafted HTTP resource requests.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022Used in ransomware

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Fortinet FortiProxy< 1.2.9 · 2.0.0
Fortinet FortiOS≥ 5.4.6 < 5.4.13 · ≥ 5.6.3 < 5.6.8 · ≥ 6.0.0 < 6.0.5

Remediation

Fixed in
Fortinet FortiProxy≥ 1.2.9
Fortinet FortiOS≥ 5.4.13

References

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Frequently asked

Is CVE-2018-13379 being actively exploited?

Yes. CVE-2018-13379 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021. It has been used in ransomware campaigns.

How severe is CVE-2018-13379?

CVE-2018-13379 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2018-13379?

Affected products include Fortinet FortiProxy, Fortinet FortiOS.

How do I fix CVE-2018-13379?

Upgrade affected software to a fixed version, for example Fortinet FortiProxy 1.2.9, Fortinet FortiOS 5.4.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-13379 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.