CVE-2016-4929 in Junos Space
Summary
by MITRE
Command injection vulnerability in Junos Space before 15.2R2 allows attackers to execute arbitrary code as a root user.
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Analysis
by VulDB Data Team • 09/10/2020
The CVE-2016-4929 vulnerability represents a critical command injection flaw within Junos Space network management platform prior to version 15.2R2. This vulnerability resides in the web-based administrative interface of the Junos Space software, which is widely deployed by enterprises for managing juniper networks. The flaw allows remote attackers to execute arbitrary commands with root privileges, effectively providing complete system compromise. The vulnerability stems from insufficient input validation and sanitization within the web application's command execution mechanisms, where user-supplied data flows directly into system commands without proper escaping or filtering.
The technical exploitation of this vulnerability occurs through carefully crafted inputs that are processed by the Junos Space web interface and subsequently passed to underlying operating system commands. Attackers can manipulate parameters in HTTP requests to inject malicious commands that are executed with the highest privileges available to the web application. This command injection vector specifically targets the way the platform handles user input in administrative functions, allowing attackers to bypass authentication mechanisms and directly execute system-level operations. The vulnerability is classified as a command injection flaw under CWE-77, which encompasses improper neutralization of special elements used in commands.
The operational impact of CVE-2016-4929 is severe and far-reaching for organizations utilizing affected Junos Space versions. Successful exploitation provides attackers with complete administrative control over the network management platform, enabling them to execute arbitrary code as root user. This access level allows for comprehensive system compromise including data exfiltration, modification of network configurations, establishment of persistent backdoors, and potential lateral movement within the network infrastructure. The vulnerability affects organizations that rely on Junos Space for managing their juniper network devices, potentially exposing critical network assets to unauthorized access. From an attack framework perspective, this vulnerability maps to multiple ATT&CK techniques including T1059 for command and script execution, T1068 for exploit for privilege escalation, and T1566 for spearphishing with attachments.
Mitigation strategies for CVE-2016-4929 primarily involve immediate patching of affected Junos Space installations to version 15.2R2 or later, which addresses the command injection vulnerability through proper input validation and sanitization mechanisms. Organizations should also implement network segmentation to limit access to Junos Space administrative interfaces, enforce strict access controls, and monitor for suspicious command execution patterns. Additional defensive measures include disabling unnecessary administrative functions, implementing web application firewalls, and conducting regular security assessments of network management platforms. The vulnerability highlights the importance of proper input validation in web applications and demonstrates how insufficient sanitization of user inputs can lead to critical privilege escalation scenarios. Organizations should also consider implementing principle of least privilege for administrative accounts and regularly review access logs for anomalous command execution activities.