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AUSCERT External Security Bulletin Redistribution
ESB-2022.6359
FortiOS & FortiProxy - SSH authentication bypass when RADIUS
authentication is used
7 December 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: FortiOS
FortiProxy
Publisher: Fortinet
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-35843
Original Bulletin:
https://fortiguard.fortinet.com/psirt/FG-IR-22-255
Comment: CVSS (Max): 7.7 CVE-2022-35843 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: Fortinet
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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FortiOS & FortiProxy - SSH authentication bypass when RADIUS authentication is used
IR Number : FG-IR-22-255
Date : Dec 6, 2022
Severity : High
CVSSv3 Score : 7.7
Impact : Improper access control
CVE ID : CVE-2022-35843
Affected Products: FortiOS:7.2.0, 7.0.6, 7.0.5, 7.0.4, 7.0.3, 7.0.2, 7.0.1, 7.0.0,
6.4.9, 6.4.8, 6.4.7, 6.4.6, 6.4.5, 6.4.4, 6.4.3, 6.4.2, 6.4.1,
6.4.0, 6.2.9, 6.2.8, 6.2.7, 6.2.6, 6.2.5, 6.2.4, 6.2.3, 6.2.2,
6.2.12, 6.2.11, 6.2.10, 6.2.1, 6.2.0, 6.0.9, 6.0.8, 6.0.7, 6.0.6,
6.0.5, 6.0.4, 6.0.3, 6.0.2, 6.0.15, 6.0.14, 6.0.13, 6.0.12, 6.0.11,
6.0.10, 6.0.1, 6.0.0
FortiProxy:7.0.5, 7.0.4, 7.0.3, 7.0.2, 7.0.1, 7.0.0, 2.0.9, 2.0.8,
2.0.7, 2.0.6, 2.0.5, 2.0.4, 2.0.3, 2.0.2, 2.0.10, 2.0.1, 2.0.0,
1.2.9, 1.2.8, 1.2.7, 1.2.6, 1.2.5, 1.2.4, 1.2.3, 1.2.2, 1.2.13,
1.2.12, 1.2.11, 1.2.10, 1.2.1, 1.2.0
Summary
An authentication bypass by assumed-immutable data vulnerability [CWE-302] in
the FortiOS SSH login component may allow a remote and unauthenticated attacker
to login into the device via sending specially crafted Access-Challenge
response from the Radius server.
Affected Products
FortiOS version 7.2.0
FortiOS version 7.0.0 through 7.0.7
FortiOS version 6.4.0 through 6.4.9
FortiOS version 6.2 all versions
FortiOS version 6.0 all versions
FortiProxy version 7.0.0 through 7.0.5
FortiProxy version 2.0.0 through 2.0.10
FortiProxy version 1.2.0 all versions
Solutions
Please upgrade to FortiOS version 7.2.2 or above
Please upgrade to FortiOS version 7.0.8 or above
Please upgrade to FortiOS version 6.4.10 or above
Please upgrade to FortiProxy version 7.0.7 or above
Please upgrade to FortiProxy version 2.0.11 or above
Acknowledgement
Fortinet is pleased to thank Egbert Nijmeijer from ICT Teamwork for reporting
this vulnerability under responsible disclosure.
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