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AUSCERT External Security Bulletin Redistribution
ESB-2021.0774
FortiGate security update
4 March 2021
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AusCERT Security Bulletin Summary
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Product: FortiGate
Publisher: Fortiguard
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Existing Account
Reduced Security -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2020-15938
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-20-172
https://fortiguard.com/psirt/FG-IR-20-193
Comment: This bulletin contains two (2) Fortiguard security advisories.
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FortiGate fails to block malformed HTTP/S traffic when transparent proxy is enabled
IR Number : FG-IR-20-172
Date : Jan 21, 2021
Risk : 2/5
Impact : Operational Risk, Traffic Bypass
CVE ID : CVE-2020-15938
Affected Products: FortiGate: 6.2, 6.4
Summary
When traffic other than HTTP/S (eg: SSH traffic, etc...) traverses the
FortiGate on port 80/443, it is not redirected to the transparent proxy policy
for processing, as it doesn't have a valid HTTP header.
Impact
Operational Risk, Traffic Bypass
Affected Products
Issue is observed only when the traffic is redirected to transparent proxy
policy.
FortiGate versions 6.4.2 and below.
FortiGate versions 6.2.5 and below.
Solutions
Please upgrade to FortiGate version 6.4.3 or above.
Workaround:
To block invalid HTTP traffic on port 80, disable the tunnel-non-http setting:
config web-proxy global
set tunnel-non-http disable
end
To block invalid HTTPS traffic on port 443, set the unsupported-ssl setting to
"block":
config firewall ssl-ssh-profile
edit [profile-name]
config https
set ports 443
set unsupported-ssl block
end
end
Acknowledgement
Fortinet is pleased to thank Marko Winkler, Tobias Leydow, Marcus Schiefer and
Sebastian Toth of T-Systems Multimedia Solutions GmbH for reporting this
vulnerability under responsible disclosure.
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XSS vulnerability in the Security Profiles comments section in FortiGate Cloud
IR Number : FG-IR-20-193
Date : Feb 24, 2021
Risk : 3/5
Impact : Unauthorized code execution
Summary
An improper neutralization of input vulnerability in FortiGate Cloud may allow
a remote authenticated attacker to perform a stored cross site scripting attack
(XSS) via the comments section of the Security Profiles.
Impact
Unauthorized code execution
Affected Products
FortiGate Cloud Version 20.3 and below.
Solutions
Fortinet has remediated this issue in FortiGate Cloud version 20.4 and hence
the customers do not need to perform any action.
Acknowledgement
Fortinet is pleased to thank Johnatan Camargo from Itau-Unibanco for reporting
this vulnerability under responsible disclosure.
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