CVE-2017-2315 : What You Need to Know

A vulnerability in the processing of IPv6 on Juniper Networks EX Series Ethernet Switches running affected versions of Junos OS has been discovered. This vulnerability allows a carefully crafted IPv6 Neighbor Discovery (ND) packet to slowly deplete memory on an EX Series Ethernet Switch, potentially leading to a denial of service.

Understanding CVE-2017-2315

This CVE identifies a denial of service vulnerability in Juniper Networks EX Series Ethernet Switches due to a memory leak when processing IPv6 packets.

What is CVE-2017-2315?

The vulnerability in Juniper Networks EX Series Ethernet Switches allows malicious network flooding with crafted IPv6 Neighbor Discovery (ND) packets, causing memory depletion and potential denial of service.

The Impact of CVE-2017-2315

The vulnerability can exhaust system resources on affected Junos OS versions, leading to a denial of service condition.

Technical Details of CVE-2017-2315

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in IPv6 processing on Juniper Networks EX Series Ethernet Switches allows for memory depletion through carefully crafted IPv6 Neighbor Discovery (ND) packets.

Affected Systems and Versions

Junos OS 12.3 versions prior to 12.3R12-S4, 12.3R13
Junos OS 13.3 versions prior to 13.3R10
Junos OS 14.1 versions prior to 14.1R8-S3, 14.1R9
Junos OS 14.1X53 versions prior to 14.1X53-D12, 14.1X53-D40
Junos OS 14.1X55 versions prior to 14.1X55-D35
Junos OS 14.2 versions prior to 14.2R6-S4, 14.2R7-S6, 14.2R8
Junos OS 15.1 versions prior to 15.1R5
Junos OS 16.1 versions before 16.1R3
Junos OS 16.2 versions before 16.2R1-S3, 16.2R2
Junos OS 17.1R1 and all subsequent releases

Exploitation Mechanism

The vulnerability is exploited by flooding the switch with specially crafted IPv6 NDP packets, gradually depleting memory resources and potentially causing a denial of service.

Mitigation and Prevention

Protect your systems from CVE-2017-2315 with the following steps:

Immediate Steps to Take

Update Junos OS to version 17.1R1 or later to resolve the vulnerability
Implement network monitoring to detect and mitigate potential denial of service attacks

Long-Term Security Practices

Regularly update and patch Junos OS to ensure the latest security fixes
Implement access control lists and filters to limit exposure to malicious traffic

Patching and Updates

Apply patches and updates provided by Juniper Networks to address the vulnerability