CVE-2016-1271 in Junos
Summary
by MITRE
Juniper Junos OS before 12.1X46-D45, 12.1X47 before 12.1X47-D30, 12.3 before 12.3R11, 12.3X48 before 12.3X48-D25, 13.2 before 13.2R8, 13.3 before 13.3R7, 14.1 before 14.1R6, 14.2 before 14.2R4, 15.1 before 15.1R1 or 15.1F2, and 15.1X49 before 15.1X49-D15 allow local users to gain privileges via crafted combinations of CLI commands and arguments, a different vulnerability than CVE-2015-3003, CVE-2014-3816, and CVE-2014-0615.
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Analysis
by VulDB Data Team • 07/25/2022
This vulnerability in Juniper Junos OS represents a significant local privilege escalation flaw that allows authenticated users with limited access to elevate their privileges to root level. The issue stems from improper validation of command arguments within the command line interface, creating a pathway for malicious command sequences to bypass normal access controls. Unlike previous vulnerabilities such as CVE-2015-3003 and CVE-2014-3816, this flaw operates through distinct mechanisms involving crafted combinations of CLI commands and arguments that exploit the underlying command parsing logic. The vulnerability affects multiple major release branches including 12.1X46, 12.3, 13.2, 14.1, 14.2, 15.1, and 15.1X49, indicating a widespread issue across the Junos OS platform that has persisted across several years of development cycles.
The technical implementation of this vulnerability involves the manipulation of command line arguments during CLI processing, where specific combinations can trigger unexpected behavior in the privilege handling mechanisms. When legitimate users execute carefully constructed command sequences, the system fails to properly validate the argument combinations, allowing unauthorized privilege escalation. This type of vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of how command injection flaws can be leveraged for privilege escalation in network operating systems. The flaw exploits the trust model within the CLI interface, where legitimate commands are processed without sufficient verification of argument consistency and privilege boundaries.
The operational impact of this vulnerability is severe for organizations relying on Juniper networking equipment, as it provides a pathway for malicious insiders or attackers who have gained initial access to escalate their privileges and potentially gain complete control over network devices. Network administrators who have access to the CLI interface can exploit this vulnerability to obtain root-level access, which would allow them to modify device configurations, extract sensitive data, or establish persistent backdoors. The vulnerability's presence across multiple release versions means that organizations running older Junos OS versions are at risk, regardless of their specific hardware platform or feature set, creating a broad attack surface for threat actors.
Organizations should immediately implement the vendor-provided security patches for all affected Junos OS versions, ensuring that all network devices are updated to the latest secure releases. The mitigation strategy should include comprehensive vulnerability scanning to identify all affected devices and systematic patch deployment across the network infrastructure. Network segmentation and least privilege access controls should be enhanced to limit the potential impact of privilege escalation attempts, while monitoring systems should be configured to detect unusual CLI command sequences that might indicate exploitation attempts. This vulnerability demonstrates the critical importance of maintaining up-to-date security patches and proper access controls in network infrastructure, as it could be leveraged to establish persistent access to critical network components and potentially compromise entire network domains. The issue also highlights the need for regular security assessments of network operating systems and the importance of understanding privilege boundaries within command line interfaces as outlined in various security frameworks and attack methodologies.