CVE-2017-2340 : What You Need to Know
Learn about CVE-2017-2340, a vulnerability in Juniper Networks Junos OS 15.1 releases from 15.1R3 to 15.1R4 and prior to 16.1R3 on M/MX platforms, causing a denial of service by triggering a PFE hang or crash.
A weakness has been identified in the processing of IPv6 ND packets on Juniper Networks Junos OS 15.1 releases from 15.1R3 to 15.1R4 and prior to 16.1R3 on M/MX platforms. This vulnerability can cause a PFE hang or crash when receiving IPv6 ND packets from subscribers intended for M/MX series routers.
Understanding CVE-2017-2340
This CVE involves a denial of service vulnerability in Juniper Networks Junos OS.
What is CVE-2017-2340?
CVE-2017-2340 is a vulnerability in the processing of IPv6 ND packets on Juniper Networks Junos OS 15.1 releases from 15.1R3 to 15.1R4 and prior to 16.1R3 on M/MX platforms.
The Impact of CVE-2017-2340
This vulnerability can lead to a PFE hang or crash when receiving IPv6 ND packets from subscribers intended for M/MX series routers, causing a denial of service.
Technical Details of CVE-2017-2340
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability occurs when Enhanced Subscriber Management is enabled for DHCPv6 subscribers, leading to a PFE hang or crash upon receiving IPv6 ND packets.
Affected Systems and Versions
- Junos OS 15.1 releases from 15.1R3 to 15.1R4
- Junos OS 16.1 prior to 16.1R3
- Junos OS 16.2R1 and subsequent releases with a resolution
- All releases prior to 15.1R3 are not affected.
Exploitation Mechanism
The vulnerability is exploited by sending IPv6 ND packets from subscribers to M/MX series routers, triggering a PFE hang or crash.
Mitigation and Prevention
Protecting systems from CVE-2017-2340 is crucial to maintaining network security.
Immediate Steps to Take
- Apply the necessary patches provided by Juniper Networks.
- Disable Enhanced Subscriber Management for DHCPv6 subscribers if not essential.
Long-Term Security Practices
- Regularly update Junos OS to the latest version to prevent vulnerabilities.
- Implement network segmentation to contain potential attacks.
Patching and Updates
- Juniper Networks has released patches to address this vulnerability.
- Stay informed about security advisories and apply updates promptly.