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AUSCERT External Security Bulletin Redistribution
FortiOS local certificate private key improper protection in
admin CLI console
15 November 2019
AusCERT Security Bulletin Summary
Publisher: FortiGuard Labs
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Existing Account
CVE Names: CVE-2019-5593
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FortiOS local certificate private key improper protection in admin CLI console
IR Number : FG-IR-19-134
Date : Nov 14, 2019
Risk : 3/5
Impact : Information Disclosure
CVE ID : CVE-2019-5593
CVE ID : CVE-2019-5593
Improper permission or value checking in the CLI console may allow a
non-privileged user to obtain plaint text private keys of system's builtin
local certificates via unsetting the keys encryption password or for user
uploaded local certificates via setting an empty password.
Note that backed up config files can be restored onto a version of FortiOS
vulnerable to this, in order to obtain the plaintext versions of local
certificates private keys encrypted in those config files.
For system builtin local certificates via unsetting password:
FortiOS 6.2.0, 6.0.0 to 6.0.6, 5.6.10 and below
For user uploaded local certificates via setting an empty password:
FortiOS 6.2.1, 6.2.0, 6.0.6 and below.
For system builtin local certificates via password unset:
Upgrade to FortiOS 5.6.11, 6.0.7 or 6.2.1 and above
For user uploaded local certificates via setting empty password:
Upgrade to FortiOS 6.0.7 or 6.2.2 and above
Always encrypt your FortiGate configuration during backup and ensure to store
or transfer your FortiGate configuration through secure channels.
Avoid disclosing your FortiGate config snippet containing the following parts:
config vpn certificate local
set password ENC xxx
set private-key "-----BEGIN ENCRYPTED PRIVATE KEY----- ..."
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