CVE-2019-0049 : Exploit Details and Defense Strategies
Discover the impact of CVE-2019-0049 on Junos OS, where the RPD process crashes during BGP peer restarts. Learn about affected versions, mitigation steps, and necessary software updates.
Junos OS: RPD process crashes when BGP peer restarts
Understanding CVE-2019-0049
This CVE involves a vulnerability in Junos devices related to the BGP graceful restart mechanism, potentially leading to Denial of Service (DoS) situations.
What is CVE-2019-0049?
The issue occurs on Junos devices when the BGP graceful restart helper mode or the BGP graceful restart mechanism is enabled. A specific sequence of restarting the BGP session on a remote peer with the graceful restart mechanism enabled can cause the local routing protocol daemon (RPD) process to crash and restart, potentially resulting in a prolonged DoS situation.
The Impact of CVE-2019-0049
- CVSS Base Score: 7.5 (High)
- Attack Vector: Network
- Availability Impact: High
- Attack Complexity: Low
- Privileges Required: None
- Scope: Unchanged
- No known malicious exploitation
Technical Details of CVE-2019-0049
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in Junos OS can lead to the RPD process crashing when a BGP peer restarts, potentially causing a DoS situation.
Affected Systems and Versions
The following Junos OS versions are affected:
- 16.1 versions prior to 16.1R7-S3
- 16.2 versions prior to 16.2R2-S9
- 17.1 versions prior to 17.1R3
- 17.2 versions prior to 17.2R3
- And more (refer to the provided data for the full list)
Exploitation Mechanism
The vulnerability can be exploited by triggering a specific sequence of BGP session restarts on a remote peer with the graceful restart mechanism enabled.
Mitigation and Prevention
Learn how to mitigate and prevent the CVE-2019-0049 vulnerability.
Immediate Steps to Take
- Disable the BGP graceful restart mechanism
- Limit BGP sessions to trusted peers
Long-Term Security Practices
- Regularly update Junos OS to the patched versions
Patching and Updates
Ensure your Junos OS is updated to the following versions or later to resolve the issue:
- 16.1R7-S3
- 16.2R2-S9
- 17.1R3
- And all subsequent releases