CVE-2016-1278 in Junos
Summary
by MITRE
Juniper Junos OS before 12.1X46-D50 on SRX Series devices reverts to "safe mode" authentication and allows root CLI logins without a password after a failed upgrade to 12.1X46, which might allow local users to gain privileges by leveraging use of the "request system software" command with the "partition" option.
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Analysis
by VulDB Data Team • 10/15/2024
The vulnerability identified as CVE-2016-1278 represents a critical security flaw in Juniper Junos OS version 12.1X46-D50 and earlier on SRX Series devices. This issue stems from improper handling of authentication mechanisms during software upgrade processes, creating a persistent security weakness that can be exploited by local attackers. The vulnerability specifically affects devices that have undergone or attempted to undergo an upgrade to the problematic software version, leaving them in a compromised state where unauthorized access becomes possible.
The technical flaw manifests when a device fails to properly complete a software upgrade process, particularly when the "request system software" command is executed with the "partition" option. During this failure scenario, the system reverts to a "safe mode" authentication state that bypasses normal password requirements for root CLI access. This behavior creates an unintended privilege escalation vector where any local user with access to the device can obtain root-level command line interface privileges without providing authentication credentials. The vulnerability is particularly concerning because it occurs during or immediately after failed upgrade operations, when system administrators might be less vigilant about monitoring access patterns.
From an operational impact perspective, this vulnerability allows local attackers to gain complete administrative control over affected SRX Series devices, potentially enabling them to modify firewall rules, access sensitive network traffic, disable security features, or establish persistent backdoors. The attack vector is relatively simple as it requires only local access to the device and knowledge of the specific command sequence that triggers the vulnerability. Network defenders face significant challenges in detecting this compromise since the system operates under normal authentication mechanisms, making unauthorized access appear legitimate to security monitoring systems.
The vulnerability aligns with CWE-284, which addresses improper access control, and maps to ATT&CK technique T1068, which covers local privilege escalation. Organizations using affected Juniper SRX devices should immediately implement mitigation strategies including applying the appropriate Juniper security patches, disabling unnecessary local access methods, and implementing robust monitoring for the specific command sequences that trigger this vulnerability. Additionally, network administrators should establish strict access controls and regularly audit system configurations to prevent exploitation attempts. The incident underscores the critical importance of proper software upgrade procedures and the necessity of maintaining secure default configurations in network security infrastructure.