#VU105695 Input validation error in Fortinet FortiWeb - CVE-2024-55594
Vulnerability identifier: #VU105695
Vulnerability risk: Medium
CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Fortinet FortiWeb
Server applications /
Remote management servers, RDP, SSH
Vendor: Fortinet, Inc
Description
The vulnerability allows a remote attacker to bypass firewall protection.
The vulnerability exists due to insufficient validation of files. A remote attacker can send a specially crafted HTTP request with an empty filename and bypass implemented firewall rules.
Mitigation
Install updates from vendor's website.
MANDATORY steps to enable the fix :
-
Update to the latest FDS version
-
Approve signature 050240001
-
Enable signature policy in corresponding Web Protection Profile, "Say Standard Protection"
-
Go to Web Protection/Input Validation/File Security/File Security Rule
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Click Create New, set name to "file_security"
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In "Request URL Type" choose "Regular Expression" in "Request URL"
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Add "/" Click "OK"
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Go to Web Protection/Input Validation/File Security/File Security Policy
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Click Create New
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Set a name say file_test
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Enable "Signature Detection", Click "OK"
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Click "Create New", Select the above added "File Security Rule", Click "OK"
-
In CLI :
'''
Config waf http-protocol-parameter-restriction
edit "hpc1"
set chunk-size-action alert_deny
set chunk-size-severity High
next
end
'''
Vulnerable software versions
Fortinet FortiWeb: 7.0.0 - 7.0.10, 7.2.0 - 7.2.10, 7.4.0 - 7.4.6
External links
https://fortiguard.fortinet.com/psirt/FG-IR-23-115
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
