Reachable Assertion in Varnish Cache - #VU25016
Published: February 7, 2020
Vulnerability identifier: #VU25016
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Varnish Software
Affected software:
Varnish Cache
Varnish Cache
Detailed vulnerability description
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 updates from vendor's website.