PSIRTProxy mode with deep inspection - Stack-based buffer overflow
Summary
A stack-based overflow vulnerability [CWE-124] in FortiOS & FortiProxy may allow a remote attacker to execute arbitrary code or command via crafted packets reaching proxy policies or firewall policies with proxy mode alongside SSL deep packet inspection.
Workaround:
Disable HTTP/2 support on SSL inspection profiles used by proxy policies or firewall policies with proxy mode.
Example with custom-deep-inspection profile:
config firewall ssl-ssh-profile
edit "custom-deep-inspection"
set supported-alpn http1-1
next
end
| Version | Affected | Solution |
|---|---|---|
| FortiOS 7.4 | Not affected | Not Applicable |
| FortiOS 7.2 | 7.2.0 through 7.2.3 | Upgrade to 7.2.4 or above |
| FortiOS 7.0 | 7.0.0 through 7.0.10 | Upgrade to 7.0.11 or above |
| FortiOS 6.4 | Not affected | Not Applicable |
| FortiOS 6.2 | Not affected | Not Applicable |
| FortiProxy 7.4 | Not affected | Not Applicable |
| FortiProxy 7.2 | 7.2.0 through 7.2.2 | Upgrade to 7.2.3 or above |
| FortiProxy 7.0 | 7.0.0 through 7.0.9 | Upgrade to 7.0.10 or above |
| FortiProxy 2.0 | Not affected | Not Applicable |
| FortiProxy 1.2 | Not affected | Not Applicable |