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AUSCERT External Security Bulletin Redistribution
ESB-2023.1049
FortiWeb - Stack-based buffer overflows in Proxyd
20 February 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiWeb
Publisher: Fortinet
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2021-42756
Original Bulletin:
https://www.fortiguard.com/psirt/FG-IR-21-186
Comment: CVSS (Max): 9.3 CVE-2021-42756 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HH)
CVSS Source: Fortinet
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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FortiWeb - Stack-based buffer overflows in Proxyd
IR Number: FG-IR-21-186
Date: Feb 16, 2023
Severity: Critical
CVSSv3 Score: 9.3
Impact: Execute unauthorized code or commands
CVE ID: CVE-2021-42756
Affected Products:
FortiWeb : 6.4.1, 6.4.0, 6.3.9, 6.3.8, 6.3.7, 6.3.6, 6.3.5, 6.3.4,
6.3.3, 6.3.2, 6.3.16, 6.3.15, 6.3.14, 6.3.13, 6.3.12, 6.3.11, 6.3.10,
6.3.1, 6.3.0, 6.2.6, 6.2.5, 6.2.4, 6.2.3, 6.2.2, 6.2.1, 6.2.0, 6.1.2,
6.1.1, 6.1.0, 6.0.7, 6.0.6, 6.0.5, 6.0.4, 6.0.3, 6.0.2, 6.0.1, 6.0.0,
5.9.1, 5.9.0, 5.8.7, 5.8.6, 5.8.5, 5.8.3, 5.8.2, 5.8.1, 5.8.0, 5.7.3,
5.7.2, 5.7.1, 5.7.0, 5.6.2, 5.6.1, 5.6.0
Summary
Multiple stack-based buffer overflow vulnerabilities [CWE-121] in FortiWeb's
proxy daemon may allow an unauthenticated remote attacker to achieve arbitrary
code execution via specifically crafted HTTP requests.
Affected Products
FortiWeb versions 5.x all versions,
FortiWeb versions 6.0.7 and below,
FortiWeb versions 6.1.2 and below,
FortiWeb versions 6.2.6 and below,
FortiWeb versions 6.3.16 and below,
FortiWeb versions 6.4 all versions.
Solutions
Upgrade to FortiWeb 7.0.0 or above,
Upgrade to FortiWeb 6.3.17 or above,
Upgrade to FortiWeb 6.2.7 or above.
Upgrade to FortiWeb 6.1.3 or above.
Upgrade to FortiWeb 6.0.8 or above.
Acknowledgement
Internally discovered and reported by Giuseppe Cocomazzi of Fortinet Product
Security team.
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