SB2020020618 - Denial of service in Varnish Cache
Published: February 6, 2020
Security Bulletin ID
SB2020020618
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) Reachable Assertion (CVE-ID: N/A)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion. when using Varnish with a TLS
termination proxy, and the proxy and Varnish use the PROXY version 2
protocol to communicate connection details. A remote attacker can send a specially crafted request to the server, cause assertion failure and restart the application, resulting in denial of service condition.
Remediation
Install update from vendor's website.