CVE-2016-1258 in Junos
Summary
by MITRE
Embedthis Appweb, as used in J-Web in Juniper Junos OS before 12.1X44-D60, 12.1X46 before 12.1X46-D45, 12.1X47 before 12.1X47-D30, 12.3 before 12.3R10, 12.3X48 before 12.3X48-D20, 13.2X51 before 13.2X51-D20, 13.3 before 13.3R8, 14.1 before 14.1R6, and 14.2 before 14.2R5, allows remote attackers to cause a denial of service (J-Web crash) via unspecified vectors.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/03/2022
The vulnerability identified as CVE-2016-1258 affects Embedthis Appweb, a lightweight web server component integrated into Juniper Junos OS through the J-Web interface. This flaw represents a critical denial of service vulnerability that enables remote attackers to crash the J-Web service without requiring authentication or privileged access. The affected Junos OS versions span multiple release branches including 12.1X, 12.3, 12.3X, 13.2X, 13.3, 14.1, and 14.2, indicating a widespread exposure across Juniper's network infrastructure products. The vulnerability specifically targets the web server functionality that serves the J-Web administrative interface, which is commonly used by network administrators to configure and manage Juniper devices remotely.
The technical nature of this vulnerability stems from unspecified vectors within the Embedthis Appweb implementation that process incoming web requests. While the exact code flaw remains unspecified in the CVE description, such denial of service vulnerabilities typically arise from improper input validation, memory corruption issues, or buffer overflow conditions within the web server's request handling mechanisms. The flaw allows attackers to craft malicious requests that trigger unexpected behavior in the web server process, ultimately leading to service termination and system instability. This type of vulnerability aligns with CWE-119 which encompasses memory safety issues, and potentially CWE-400 which addresses resource exhaustion vulnerabilities. The attack vector operates entirely over the network without requiring physical access or elevated privileges, making it particularly dangerous for network infrastructure devices.
The operational impact of CVE-2016-1258 extends beyond simple service disruption to potentially compromise network management capabilities and operational continuity. When the J-Web interface crashes, network administrators lose their primary means of remote configuration and monitoring for the affected device, forcing reliance on alternative access methods such as console connections or out-of-band management systems. This vulnerability poses significant risk to network availability and can be exploited as part of broader attack campaigns targeting network infrastructure. The impact is particularly severe in enterprise environments where Juniper devices serve as core networking components, as the loss of J-Web functionality can cascade into extended service interruptions and increased operational overhead. The vulnerability also demonstrates the risk associated with embedded web servers in network devices, as these components often receive less security scrutiny than traditional enterprise applications.
Mitigation strategies for CVE-2016-1258 focus primarily on applying official Juniper security patches and firmware updates that address the underlying vulnerability in Embedthis Appweb. Network administrators should prioritize updating affected Junos OS versions to the patched releases specified in Juniper's security advisories, particularly versions 12.1X44-D60, 12.1X46-D45, 12.1X47-D30, 12.3R10, 12.3X48-D20, 13.2X51-D20, 13.3R8, 14.1R6, and 14.2R5. Additionally, implementing network segmentation and access controls to limit exposure of J-Web services can reduce attack surface, though this does not eliminate the vulnerability itself. Organizations should consider disabling J-Web functionality when not actively required, as outlined in the MITRE ATT&CK framework's approach to reducing attack surface areas. Security monitoring should include detection of unusual traffic patterns or service disruptions that might indicate exploitation attempts. The vulnerability also highlights the importance of maintaining current security patches across all network infrastructure components and demonstrates the need for comprehensive vulnerability management programs that address embedded systems and third-party components within network devices.