CVE-2024-39563 Overview
CVE-2024-39563 is a command injection vulnerability [CWE-77] in Juniper Networks Junos Space. An unauthenticated, network-based attacker can send a specially crafted GET request to a vulnerable script in the Junos Space web application. The script accepts attacker-controlled input without sufficient sanitization, allowing arbitrary shell command execution on the Junos Space Appliance.
Successful exploitation grants complete control of the device. The issue affects Junos Space 24.1R1 only. Previous versions of Junos Space are not affected by this vulnerability.
Critical Impact
Unauthenticated remote attackers can execute arbitrary shell commands on the Junos Space Appliance, gaining full administrative control of the network management platform.
Affected Products
- Juniper Networks Junos Space 24.1R1
Discovery Timeline
- 2024-10-11 - CVE-2024-39563 published to NVD
- 2026-01-23 - Last updated in NVD database
Technical Details for CVE-2024-39563
Vulnerability Analysis
The vulnerability resides in a specific script within the Junos Space web application. This script processes parameters received from HTTP GET requests and passes attacker-controlled values to a shell context without adequate validation or escaping. An unauthenticated attacker with network access to the Junos Space Appliance management interface can submit a crafted request to inject shell metacharacters into the underlying command execution.
Junos Space functions as the central network management system for Juniper devices. Compromise of the appliance can expose stored credentials, device configurations, and management connectivity to downstream network infrastructure. Attackers gaining shell-level access can pivot, persist, or alter managed device configurations.
The EPSS score is approximately 1.34%, placing this issue in the 80th percentile for exploitation likelihood. No public exploit code or CISA KEV listing exists at this time.
Root Cause
The root cause is improper neutralization of special elements used in a command [CWE-77]. The affected script concatenates user-supplied GET parameters into a shell command without sanitizing shell metacharacters such as ;, |, &, backticks, or $(). This pattern allows an attacker to break out of the intended command syntax and append arbitrary commands.
Attack Vector
The attack is performed over the network against the Junos Space management web interface. No authentication or user interaction is required. The attacker sends an HTTP GET request to the vulnerable endpoint with a payload embedded in a query parameter. The Junos Space application then executes the injected shell commands with the privileges of the web application process.
No verified public proof-of-concept code is available. Refer to the Juniper Security Advisory JSA88110 for vendor technical details.
Detection Methods for CVE-2024-39563
Indicators of Compromise
- Unexpected shell processes spawned by the Junos Space web application user account
- HTTP GET requests to Junos Space web endpoints containing shell metacharacters such as ;, |, &, backticks, or $() in query parameters
- Outbound network connections from the Junos Space Appliance to unknown external hosts
- Modifications to system binaries, cron entries, or startup scripts on the appliance
Detection Strategies
- Inspect web server access logs on the Junos Space Appliance for GET requests containing URL-encoded shell metacharacters or suspiciously long query strings
- Monitor process creation events that show shell interpreters spawned as children of the Junos Space web application service
- Deploy network intrusion detection signatures targeting command injection patterns in HTTP traffic to Junos Space management ports
Monitoring Recommendations
- Forward Junos Space appliance logs, including web access and authentication logs, to a centralized SIEM for correlation
- Alert on any new outbound connections initiated by the Junos Space Appliance to non-management destinations
- Track changes to Junos Space configuration files and user account databases through file integrity monitoring
How to Mitigate CVE-2024-39563
Immediate Actions Required
- Identify all Junos Space instances running version 24.1R1 and apply the fixed release per Juniper Security Advisory JSA88110
- Restrict network access to the Junos Space management interface to trusted administrative networks only
- Review web access logs for indicators of prior exploitation attempts targeting the vulnerable script
- Rotate credentials and API tokens stored on or used by the Junos Space Appliance if compromise is suspected
Patch Information
Juniper Networks has published remediation guidance in Juniper Security Advisory JSA88110. Administrators should upgrade Junos Space 24.1R1 to the fixed release identified by Juniper. Earlier versions of Junos Space are not affected and do not require this patch.
Workarounds
- Place the Junos Space management interface behind a VPN or jump host accessible only to authorized administrators
- Apply firewall access control lists to permit management traffic only from designated administrative source IP addresses
- Disable external exposure of the Junos Space web application until the vendor patch can be applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
