CVE-2020-1666: Junos OS Evolved: 'console log-out-on-disconnect' fails to terminate session on console cable disconnection
First published: Wed Oct 14 2020(Updated: )
The system console configuration option 'log-out-on-disconnect' In Juniper Networks Junos OS Evolved fails to log out an active CLI session when the console cable is disconnected. This could allow a malicious attacker with physical access to the console the ability to resume a previous interactive session and possibly gain administrative privileges. This issue affects all Juniper Networks Junos OS Evolved versions after 18.4R1-EVO, prior to 20.2R1-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Networks Junos OS Evolved | =19.2-r1 | |
| Juniper Networks Junos OS Evolved | =19.2-r2 | |
| Juniper Networks Junos OS Evolved | =19.3-r2 | |
| Juniper Networks Junos OS Evolved | =19.4-r1 | |
| Juniper Networks Junos OS Evolved | =19.4-r2 | |
| Juniper Networks Junos OS Evolved | =19.4-r2-s1 | |
| Juniper Networks Junos OS Evolved | =20.1-r1 |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS Evolved 20.2R1-EVO and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-1666?
CVE-2020-1666 is rated as a high severity vulnerability due to the potential for unauthorized access.
How does CVE-2020-1666 affect Junos OS Evolved?
CVE-2020-1666 allows an attacker with physical access to resume an active CLI session after disconnecting the console cable.
Which versions of Junos OS Evolved are affected by CVE-2020-1666?
CVE-2020-1666 affects Junos OS Evolved versions 19.2-r1, 19.2-r2, 19.3-r2, 19.4-r1, 19.4-r2, 19.4-r2-s1, and 20.1-r1.
How do I fix CVE-2020-1666?
To mitigate CVE-2020-1666, it's recommended to upgrade to a patched version of Junos OS Evolved.
What can an attacker do if they exploit CVE-2020-1666?
If exploited, an attacker can gain unauthorized access by resuming an active CLI session after console disconnection.
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