CVE-2019-0014 : Exploit Details and Defense Strategies
Learn about CVE-2019-0014, a high-severity vulnerability in Junos OS affecting QFX and PTX Series devices. Find out the impact, affected versions, and mitigation steps.
A vulnerability in Junos OS affecting QFX and PTX Series devices could lead to a Denial of Service (DoS) attack by crashing the FPC process.
Understanding CVE-2019-0014
This CVE involves a specific issue in Junos OS that impacts the FPC process on QFX and PTX Series devices when processing J-Flow packets.
What is CVE-2019-0014?
When a malformed packet is received for J-Flow sampling, it can cause the FPC process to crash, resulting in the shutdown of all interfaces on the affected devices. This vulnerability can be exploited by an attacker to launch a sustained DoS attack.
The Impact of CVE-2019-0014
- Severity: High
- CVSS Base Score: 7.5
- Attack Vector: Network
- Availability Impact: High
- Affected Systems: QFX and PTX Series
Technical Details of CVE-2019-0014
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability allows an attacker to crash the FPC process on QFX and PTX Series devices by sending a malformed packet for J-Flow sampling.
Affected Systems and Versions
- Affected Platforms: QFX and PTX Series
- Affected Versions:
- Junos OS 17.4 versions prior to 17.4R2-S1, 17.4R3
- Junos OS 18.1 versions prior to 18.1R3-S1
- Junos OS 18.2 versions prior to 18.2R1-S3, 18.2R2
- Junos OS 17.2X75 versions prior to 17.2X75-D91, 17.2X75-D100
Exploitation Mechanism
- The vulnerability can be exploited by continuously sending malicious packets for J-Flow sampling, leading to a sustained DoS attack.
Mitigation and Prevention
Effective measures to mitigate and prevent exploitation of this vulnerability.
Immediate Steps to Take
- Disable the functionality of learning next-hop addresses in the affected configurations.
Long-Term Security Practices
- Regularly update Junos OS to the latest patched versions.
Patching and Updates
- Update to the following software releases to address the vulnerability: Junos OS 17.2X75-D91, 17.2X75-D100, 17.4R2-S1, 17.4R3, 18.1R3-S1, 18.2R1-S3, 18.2R2, 18.2X75-D5, 18.3R1, and all subsequent releases.