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AUSCERT External Security Bulletin Redistribution
ESB-2021.1891
FortiWLC security update
2 June 2021
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AusCERT Security Bulletin Summary
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Product: FortiWLC
Publisher: FortiGuard Labs
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Cross-site Scripting -- Remote with User Interaction
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-26094 CVE-2021-26093 CVE-2021-26087
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-21-002
https://fortiguard.com/psirt/FG-IR-21-001
https://fortiguard.com/psirt/FG-IR-20-137
Comment: This bulletin contains three (3) FortiGuard Labs security
advisories.
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FortiWLC - Access of Uninitialized Pointer vulnerability
IR Number : FG-IR-21-002
Date : Jun 01, 2021
Risk : 3/5
CVSSv3 Score : 6.6
Impact : Denial of service
CVE ID : CVE-2021-26093
Summary
An access of uninitialized pointer (CWE-824) vulnerability in FortiWLC may
allow a local and authenticated attacker to crash the access point being
managed by the controller by executing a crafted CLI command.
Impact
Denial of service
Affected Products
FortiWLC version 8.6.0. FortiWLC versions 8.5.3 and below.
Solutions
Please upgrade to FortiWLC version 8.6.1 or above.
Please upgrade to FortiWLC version 8.5.4 or above.
Acknowledgement
Fortinet is pleased to thank a FortiWLC customer for bringing this issue to our
attention.
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FortiWLC - Multiple Buffer Overflow vulnerabilities
IR Number : FG-IR-21-001
Date : Jun 01, 2021
Risk : 3/5
CVSSv3 Score : 6.9
Impact : Remote code execution, Denial of Service
CVE ID : CVE-2021-26094
Summary
Multiple instances of stack-based buffer overflow vulnerability (CWE-121) in
the command line interface of FortiWLC may allow a local, authenticated
attacker to crash the access point being managed by the controller and
potentially execute unauthorized code via a specifically crafted CLI command.
Impact
Remote code execution, Denial of Service
Affected Products
FortiWLC versions 8.6.0 and below. FortiWLC versions 8.5.3 and below.
Solutions
Please upgrade to FortiWLC version 8.6.1 or above.
Please upgrade to FortiWLC version 8.5.4 or above.
Acknowledgement
Internally discovered and reported by Nesrine Kortas from Fortinet PSIRT.
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FortiWLC - XSS vulnerability
IR Number : FG-IR-20-137
Date : May 28, 2021
Risk : 3/5
CVSSv3 Score : 4.2
Impact : Execute unauthorized code or commands
CVE ID : CVE-2021-26087
Summary
An improper neutralization of input during web page generation in FortiWLC web
interface may allow both authenticated remote attackers and non-authenticated
attackers in the same network as the appliance to perform a stored cross site
scripting attack (XSS) via injecting malicious payloads in different locations.
Impact
Execute unauthorized code or commands
Affected Products
FortiWLC version 8.6.0. FortiWLC versions 8.5.3 and below.
Solutions
Please upgrade to FortiWLC version 8.6.1 or above. Please upgrade to FortiWLC
version 8.5.4 or above.
Acknowledgement
Fortinet is pleased to thank the customer who reported this vulnerability under
responsible disclosure.
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