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AUSCERT External Security Bulletin Redistribution
ESB-2023.2494
FortiOS & FortiProxy - Out-of-bound-write in sslvpnd
4 May 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiOS
FortiProxy
Publisher: Fortinet
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-22640
Original Bulletin:
https://fortiguard.fortinet.com/psirt/FG-IR-22-475
Comment: CVSS (Max): 7.1 CVE-2023-22640 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C)
CVSS Source: Fortinet
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
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FortiOS & FortiProxy - Out-of-bound-write in sslvpnd
IR Number : FG-IR-22-475
Date : May 3, 2023
Severity : High
CVSSv3 Score : 7.1
Impact : Execute unauthorized code or commands
CVE ID : CVE-2023-22640
Affected Products:
FortiOS: 7.2.3, 7.2.2, 7.2.1, 7.2.0, 7.0.9, 7.0.8, 7.0.7,
7.0.6, 7.0.5, 7.0.4, 7.0.3, 7.0.2, 7.0.10, 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, 6.4.11, 6.4.10, 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, 6.2.13, 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, 6.0.16, 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: 7.2.1, 7.2.0, 7.0.7, 7.0.6, 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,
2.0.12, 2.0.11, 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, 1.1.6,
1.1.5, 1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.1.0, 1.0.7, 1.0.6, 1.0.5, 1.0.4,
1.0.3, 1.0.2, 1.0.1, 1.0.0
Summary
An out-of-bounds write vulnerability [CWE-787] in sslvpnd of FortiOS and
FortiProxy may allow an authenticated attacker to achieve arbitrary code
execution via specifically crafted requests.
Affected Products
FortiOS version 7.2.0 through 7.2.3
FortiOS version 7.0.0 through 7.0.10
FortiOS version 6.4.0 through 6.4.11
FortiOS version 6.2.0 through 6.2.13
FortiOS 6.0 all versions
FortiProxy version 7.2.0 through 7.2.1
FortiProxy version 7.0.0 through 7.0.7
FortiProxy all versions 2.0, 1.2, 1.1, 1.0
Solutions
Please upgrade to FortiOS version 7.4.0 or above
Please upgrade to FortiOS version 7.2.4 or above
Please upgrade to FortiOS version 7.0.11 or above
Please upgrade to FortiOS version 6.4.12 or above
Please upgrade to FortiOS version 6.2.14 or above
Please upgrade to FortiProxy version 7.2.2 or above
Please upgrade to FortiProxy version 7.0.8 or above
Workaround:
Disable "Host Check", "Restrict to Specific OS Versions" and "MAC address host
checking" in sslvpn portal configuration. For example for " full-access" sslvpn
portal:
config vpn ssl web portal
edit "full-access"
set os-check disable
set host-check none
set mac-addr-check disable
end
Acknowledgement
Internally discovered and reported by Gwendal Guegniaud of Fortinet Product
Security team in the frame of an internal audit of the SSL-VPN component.
Timeline
2023-04-13: Initial publication
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