CVE-2024-39520: Junos OS Evolved: CLI parameter processing issue allows privilege escalation
First published: Thu Jul 11 2024(Updated: )
An Improper Neutralization of Special Elements vulnerability in Juniper Networks Junos OS Evolved commands allows a local, authenticated attacker with low privileges to escalate their privileges to 'root' leading to a full compromise of the system. The Junos OS Evolved CLI doesn't properly handle command options in some cases, allowing users which execute specific CLI commands with a crafted set of parameters to escalate their privileges to root on shell level. This issue affects Junos OS Evolved: * All version before 20.4R3-S6-EVO, * 21.2-EVO versions before 21.2R3-S4-EVO, * 21.4-EVO versions before 21.4R3-S6-EVO, * 22.2-EVO versions before 22.2R2-S1-EVO, 22.2R3-EVO, * 22.3-EVO versions before 22.3R2-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Junos OS Evolved | <20.4 | |
| Junos OS Evolved | =20.4 | |
| Junos OS Evolved | =20.4-r1 | |
| Junos OS Evolved | =20.4-r1-s1 | |
| Junos OS Evolved | =20.4-r1-s2 | |
| Junos OS Evolved | =20.4-r2 | |
| Junos OS Evolved | =20.4-r2-s1 | |
| Junos OS Evolved | =20.4-r2-s2 | |
| Junos OS Evolved | =20.4-r2-s3 | |
| Junos OS Evolved | =20.4-r3 | |
| Junos OS Evolved | =20.4-r3-s1 | |
| Junos OS Evolved | =20.4-r3-s2 | |
| Junos OS Evolved | =20.4-r3-s3 | |
| Junos OS Evolved | =20.4-r3-s4 | |
| Junos OS Evolved | =20.4-r3-s5 | |
| Junos OS Evolved | =21.2 | |
| Junos OS Evolved | =21.2-r1 | |
| Junos OS Evolved | =21.2-r1-s1 | |
| Junos OS Evolved | =21.2-r1-s2 | |
| Junos OS Evolved | =21.2-r2 | |
| Junos OS Evolved | =21.2-r2-s1 | |
| Junos OS Evolved | =21.2-r2-s2 | |
| Junos OS Evolved | =21.2-r3 | |
| Junos OS Evolved | =21.2-r3-s1 | |
| Junos OS Evolved | =21.2-r3-s2 | |
| Junos OS Evolved | =21.2-r3-s3 | |
| Junos OS Evolved | =21.2-r3-s4 | |
| Junos OS Evolved | =21.4 | |
| Junos OS Evolved | =21.4-r1 | |
| Junos OS Evolved | =21.4-r1-s1 | |
| Junos OS Evolved | =21.4-r1-s2 | |
| Junos OS Evolved | =21.4-r2 | |
| Junos OS Evolved | =21.4-r2-s1 | |
| Junos OS Evolved | =21.4-r2-s2 | |
| Junos OS Evolved | =21.4-r3 | |
| Junos OS Evolved | =21.4-r3-s1 | |
| Junos OS Evolved | =21.4-r3-s2 | |
| Junos OS Evolved | =21.4-r3-s3 | |
| Junos OS Evolved | =21.4-r3-s4 | |
| Junos OS Evolved | =21.4-r3-s5 | |
| Junos OS Evolved | =22.2 | |
| Junos OS Evolved | =22.2-r1 | |
| Junos OS Evolved | =22.2-r1-s1 | |
| Junos OS Evolved | =22.2-r2 | |
| Junos OS Evolved | =22.3 | |
| Junos OS Evolved | =22.3-r1 | |
| Junos OS Evolved | =22.3-r1-s1 | |
| Junos OS Evolved | =22.3-r1-s2 |
Remedy
The following software releases have been updated to resolve this specific issue: 20.4R3-S6-EVO, 21.2R3-S4-EVO, 21.4R3-S6-EVO, 22.2R2-S1-EVO, 22.2R3-EVO, 22.3R2-EVO, 22.4R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-39520?
CVE-2024-39520 has a high severity rating due to its potential to allow local authenticated attackers to escalate privileges to root.
How do I fix CVE-2024-39520?
To remediate CVE-2024-39520, you should update the Junos OS Evolved to the latest version that is not affected by this vulnerability.
What type of attack can exploit CVE-2024-39520?
CVE-2024-39520 can be exploited by local, authenticated attackers to conduct privilege escalation on affected systems.
Which versions of Junos OS Evolved are affected by CVE-2024-39520?
CVE-2024-39520 affects multiple versions of Junos OS Evolved up to version 20.4 and includes certain releases from the 21.x and 22.x versions prior to necessary patches.
Is there a workaround for CVE-2024-39520 until I can apply a fix?
There is no documented workaround for CVE-2024-39520; applying the appropriate software update is recommended to mitigate the issue.
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