SB2018020104 - Denial of service in Cisco ASR 9000 Series Routers
Published: February 1, 2018
Security Bulletin ID
SB2018020104
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper input validation (CVE-ID: CVE-2018-0136)
The vulnerability allows a remote attacker to cause DoS condition no the target system.
The vulnerability exists in the IPv6 subsystem due to incorrect handling of IPv6 packets with a fragment header extension. A remote attacker can send specially crafted IPv6 packets designed to trigger the issue either to or through the Trident-based line card and cause the Trident-based line cards to reload during the period of time the line card takes to restart.
Successful exploitation of the vulnerability results in denial of service.
Remediation
Install update from vendor's website.