#VU69128 Server-Side Request Forgery (SSRF) in Varnish Cache and Varnish Enterprise - CVE-2022-45060

Vulnerability identifier: #VU69128

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-45060

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Varnish Cache
Server applications / IDS/IPS systems, Firewalls and proxy servers
Varnish Enterprise
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Varnish Software

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Varnish Cache: 6.0.0 - 6.0.10, 7.0.0 - 7.0.3, 7.1.0 - 7.1.1, 7.2.0

Varnish Enterprise: before 6.0.10r3

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External links
https://docs.varnish-software.com/security/VSV00011

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.