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CVE-2017-2345 : What You Need to Know

Learn about CVE-2017-2345 affecting Juniper Networks Junos OS devices with SNMP enabled. Discover the impact, affected versions, and mitigation steps to prevent a denial of service attack.

Junos OS devices with SNMP enabled are vulnerable to a denial of service attack. Learn about the impact, affected systems, and mitigation steps.

Understanding CVE-2017-2345

Junos OS devices with SNMP enabled are susceptible to an attack where a network-based attacker can crash the snmpd daemon by sending a crafted SNMP packet, potentially leading to a partial denial of service or remote code execution.

What is CVE-2017-2345?

This CVE affects Juniper Networks Junos OS versions with SNMP enabled, allowing attackers to crash the snmpd daemon through specially crafted SNMP packets.

The Impact of CVE-2017-2345

        CVSS Base Score: 9.8 (Critical)
        Attack Vector: Network
        Confidentiality Impact: High
        Integrity Impact: High
        Availability Impact: High
        Privileges Required: None
        Scope: Unchanged
        User Interaction: None

Technical Details of CVE-2017-2345

Vulnerability Description

        Attackers can crash the snmpd daemon on Junos OS devices with SNMP enabled using crafted packets, potentially leading to a denial of service or remote code execution.

Affected Systems and Versions

        All Juniper Networks Junos OS versions with SNMP enabled are affected.
        Specific affected versions include 12.1X46-D67, 12.3X48-D51, 12.3X48-D55, and more.

Exploitation Mechanism

        Attackers exploit the SNMP vulnerability by sending malicious packets to crash the snmpd daemon.

Mitigation and Prevention

Immediate Steps to Take

        Disable SNMP if not required (disabled by default).
        Implement edge filtering with source-address validation (uRPF, etc.).
        Use SNMP access lists and/or SNMPv3 authentication to restrict access to trusted hosts.

Long-Term Security Practices

        Regularly update Junos OS to the latest patched versions.
        Monitor security advisories from Juniper Networks for any new vulnerabilities.

Patching and Updates

        Update to the following patched versions to resolve the issue: 12.1X46-D67, 12.3X48-D51, 12.3X48-D55, and more.

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