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Junos Os EvolvedOperating system · Juniper

CVE-2024-39546

HIGH · 7.3 CVSS v3.1 Published 2024-07-11
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
73/100
Remediation priority · Elevated

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A Missing Authorization vulnerability in the Socket Intercept (SI) command file interface of Juniper Networks Junos OS Evolved allows an authenticated, low-privilege local attacker to modify certain files, allowing the attacker to cause any command to execute with root privileges leading to privilege escalation ultimately compromising the system.  This issue affects Junos OS Evolved:  * All versions prior to 21.2R3-S8-EVO,  * 21.4 versions prior to  21.4R3-S6-EVO,  * 22.1 versions prior to 22.1R3-S5-EVO,  * 22.2 versions prior to 22.2R3-S3-EVO,  * 22.3 versions prior to 22.3R3-S3-EVO,  * 22.4 versions prior to 22.4R3-EVO,  * 23.2 versions prior to 23.2R2-EVO.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Missing authorization in the Socket Intercept (SI) command file interface of Junos OS Evolved allows an authenticated low-privilege local attacker to modify certain files and execute arbitrary commands with root privileges, enabling complete system compromise through privilege escalation.

MitigationApply the vendor-supplied patches for all affected versions (21.2R3-S8-EVO, 21.4R3-S6-EVO, 22.1R3-S5-EVO, 22.2R3-S3-EVO, 22.3R3-S3-EVO, 22.4R3-EVO, and 23.2R2-EVO or later). Until patches are applied, limit local access to trusted personnel and monitor for suspicious file modifications.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Junos Os EvolvedOperating system
Affected:= 18.3= 19.1= 19.2= 19.3= 19.4= 20.1= 20.2= 20.3= 20.4= 21.1= 21.2= 21.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Junos OS Evolved version
    Run 'show version' or 'cat /etc/version' to obtain the installed Junos OS Evolved version number
    Affected if The installed version matches any of these: 18.3, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2, 21.4
  2. Verify Socket Intercept feature status
    Check if the Socket Intercept (SI) command file interface is present or enabled on the system - look for SI-related processes, modules, or configuration entries
    Affected if Socket Intercept (SI) functionality is available or enabled on the device
  3. Inspect for unauthorized file modifications
    Review system files in /var/log and configuration directories for unexpected changes, especially files that should only be modified by privileged processes
    Affected if Files show modification timestamps or content changes that were not initiated by legitimate administrators
  4. Check for privilege escalation indicators
    Audit system logs and process listings for commands or scripts executed by low-privilege users that resulted in root-level operations
    Affected if Low-privilege user accounts show execution of root-privileged commands they should not have access to

The environment is affected if Junos OS Evolved version matches an affected release (18.3 through 21.4) AND Socket Intercept functionality is present on the system.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the vendor-supplied patches for all affected versions (21.2R3-S8-EVO, 21.4R3-S6-EVO, 22.1R3-S5-EVO, 22.2R3-S3-EVO, 22.3R3-S3-EVO, 22.4R3-EVO, and 23.2R2-EVO or later). Until patches are applied, limit local access to trusted personnel and monitor for suspicious file modifications.

Recommended fix High confidence

21.2R3-S8-EVO or later (recommended: 22.4R3-EVO or 23.2R2-EVO)

  1. 1. Identify the current Junos OS Evolved version using 'show version' command
  2. 2. Schedule a maintenance window for the upgrade process
  3. 3. Backup current configuration using 'request system configuration rescue save'
  4. 4. Download the appropriate fixed version from Juniper support portal (21.2R3-S8-EVO or later)
  5. 5. Transfer the upgrade package to the device using 'file copy' or SCP
  6. 6. Install the upgrade using 'request system software add <package> reboot'
  7. 7. After reboot, verify the new version using 'show version'
  8. 8. Confirm the fix is applied by checking the SI (Socket Intercept) command file permissions
Caveat Major version upgrade may require configuration adjustments; test thoroughly in lab environment before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Junos Os Evolved Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing5.0 h
  • Review / QA3.0 h
17.0 hours of engineering $2,970
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-39546 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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  • No spam, self-promotion, credentials, or personal data