Multiple vulnerabilities in Varnish Cache



Published: 2022-11-08 | Updated: 2022-11-28
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2022-45060
CVE-2022-45059
CWE-ID CWE-918
CWE-444
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		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

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU69128

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-45060

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: No

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 - 7.2.0

Varnish Enterprise: before 6.0.10r3

External links

http://docs.varnish-software.com/security/VSV00011


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU69126

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-45059

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

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.


Mitigation

Install updates from vendor's website.

Vulnerable software versions

Varnish Cache: 7.0.0 - 7.2.0

External links

http://docs.varnish-software.com/security/VSV00010


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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