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AUSCERT External Security Bulletin Redistribution
ESB-2019.2820
FortiGate default configuration does not verify the LDAP server identity.
29 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiGate FortiOS
Publisher: Fortiguard
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-5591
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-19-037
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FortiGate default configuration does not verify the LDAP server identity.
IR Number : FG-IR-19-037
Date : Jul 26, 2019
Risk : 3/5
Impact : Information Disclosure
CVE ID : CVE-2019-5591
Summary
A Default Configuration vulnerability in FortiOS may allow an unauthenticated
attacker on the same subnet to intercept sensitive information by impersonating
the LDAP server.
Impact
Information Disclosure
Affected Products
FortiOS 6.2.0 and below.
Solutions
For users running versions 6.0.3 to 6.2.0, enabling the CLI option that checks
for LDAP server identity entirely prevents the issue:
config user ldap
edit ldap-server
set server-identity-check enable
FortiOS 6.2.1 and above have server-identity-check enabled by default, when
installed from scratch.
However, for compatibility reasons, the value of server-identity-check is kept
unchanged throughout firmware upgrading. In other words, upgrading from 6.0.3 -
6.2.0 to 6.2.1 and above does not suffice to thwart the issue:
server-identity-check must be enabled (prior the upgrade of after,
indifferently).
Acknowledgement
Fortinet is pleased to thank James Renken from the Internet Security Research
Group and Florian Thiele for bringing this issue to our attention under
responsible disclosure.
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