PSIRTFortiOS - IP address validation mishandles zero characters
Summary
An incorrect parsing of numbers with different radices vulnerability [CWE-1389] in FortiOS and FortiProxy IP address validation feature may permit an unauthenticated attacker to bypass the IP blocklist via crafted requests.
| Version | Affected | Solution |
|---|---|---|
| FortiOS 7.6 | Not affected | Not Applicable |
| FortiOS 7.4 | 7.4.0 through 7.4.3 | Upgrade to 7.4.4 or above |
| FortiOS 7.2 | 7.2.0 through 7.2.8 | Upgrade to 7.2.9 or above |
| FortiOS 7.0 | 7.0 all versions | Migrate to a fixed release |
| FortiOS 6.4 | Not affected | Not Applicable |
| FortiProxy 7.4 | 7.4.0 through 7.4.3 | Upgrade to 7.4.4 or above |
| FortiProxy 7.2 | 7.2.12 through 7.2.16 | Upgrade to 7.2.11 or above |
| FortiProxy 7.2 | 7.2.0 through 7.2.10 | Upgrade to 7.2.11 or above |
| FortiProxy 7.0 | 7.0 all versions | Migrate to a fixed release |
| FortiProxy 2.0 | Not affected | Not Applicable |
Acknowledgement
Fortinet is pleased to thank Tim Yu from Bell Canada for reporting this vulnerability under responsible disclosure.Timeline
2024-07-09: Initial publication2024-09-06: Fixed versions updated
2025-07-04: Updated Fixed version for FortiProxy