SB2022110886 - Multiple vulnerabilities in Varnish Cache

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2022-45060)

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input when handling HTTP/2 requests. A remote attacker can introduce characters through the HTTP/2 pseudo-headers that are invalid in the context of an HTTP/1 request line, causing the Varnish server to produce invalid HTTP/1 requests to the backend.

2) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2022-45059)

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers. Among the headers that can be filtered this way are both Content-Length</code> and <code>Host, making it possible for an attacker to both break the HTTP/1 protocol framing, and bypass request to host routing in VCL.

Remediation

Install update from vendor's website.

References

• https://docs.varnish-software.com/security/VSV00011
• https://docs.varnish-software.com/security/VSV00010