Debian update for varnish

Published: 2022-03-04

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-36740 CVE-2022-23959
CWE-ID	CWE-444
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	varnish (Debian package) Operating systems & Components / Operating system package or component
Vendor	Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU55501

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-2021-36740

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

Exploit availability: No

Description

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

The vulnerability exists due to improper validation of HTTP/2 requests. A remote attacker can send a specially crafted HTTP/2 POST request with a large Content-Length header to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache or bypass VCL authorization.

Mitigation

Update varnish package to one of the following versions: 6.1.1-1+deb10u3, 6.5.1-1+deb11u2.

Vulnerable software versions

varnish (Debian package): 6.1.0-1 - 6.5.1-1

External links

http://www.debian.org/security/2022/dsa-5088

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.

2) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU60291