A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, Forti

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• fortinet fortios7.0.0 and later · before 7.0.18
• fortinet fortios7.2.0 and later · before 7.2.12
• fortinet fortios7.4.0 and later · before 7.4.9
• fortinet fortios7.6.0 and later · before 7.6.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (fortinet). Independent of NVD's CPE analysis and usually ahead of it.

• Fortinet FortiOS

  • 7.6.0 and later · up to and including 7.6.3affected · semver
  • 7.4.0 and later · up to and including 7.4.8affected · semver
  • 7.2.0 and later · up to and including 7.2.11affected · semver
  • 7.0.0 and later · up to and including 7.0.17affected · semver

• Fortinet FortiProxy

  • 7.6.0 and later · up to and including 7.6.3affected · semver
  • 7.4.0 and later · up to and including 7.4.10affected · semver
  • 7.2.0 and later · up to and including 7.2.14affected · semver
  • 7.0.0 and later · up to and including 7.0.21affected · semver

• Fortinet FortiSwitchManager

  • 7.2.0 and later · up to and including 7.2.6affected · semver
  • 7.0.0 and later · up to and including 7.0.5affected · semver

Other highest-scoring records for the same primary product.

• CVE-2022-40684An authentication bypass using an alternate path or channel [CWE-288] in Fortinet FortiOS version 7.2.0 through 7.2.1 and 7.0.0 through 7.0.KEV
  99Now
• CVE-2018-13379An 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 5.4KEV
  99Now
• CVE-2024-55591An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiKEV
  97Now
• CVE-2023-27997A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below,KEV
  95Now
• CVE-2024-21762A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2KEV
  94Now
• CVE-2024-23113A use of externally-controlled format string in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, FoKEV
  88Now

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The verifier takes the algorithm to verify with from the token’s own header. Untrusted data ends up deciding its own verification rule.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const claims = jwt.verify(token, publicKey);

1const claims = jwt.verify(token, publicKey, {2  algorithms: ["RS256"],3  issuer: "https://id.example.com",4  audience: "portal",5});

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.