Varnish Cache up to 6.0.10/7.1.1/7.2.0 HTTP/2 response splitting

Summaryinfo

A vulnerability classified as critical was found in Varnish Cache up to 6.0.10/7.1.1/7.2.0. This affects an unknown function of the component HTTP2 Handler. The manipulation results in response splitting. This vulnerability is identified as CVE-2022-45060. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in Varnish Cache up to 6.0.10/7.1.1/7.2.0. Affected is an unknown function of the component HTTP2 Handler. The manipulation with an unknown input leads to a response splitting vulnerability. CWE is classifying the issue as CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An HTTP Request Forgery issue was discovered in Varnish Cache 5.x and 6.x before 6.0.11, 7.x before 7.1.2, and 7.2.x before 7.2.1. An attacker may introduce characters through 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. This could, in turn, be used to exploit vulnerabilities in a server behind the Varnish server. Note: the 6.0.x LTS series (before 6.0.11) is affected.

The weakness was released 11/09/2022. The advisory is shared for download at docs.varnish-software.com. This vulnerability is traded as CVE-2022-45060 since 11/09/2022. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 211051 (Fedora 37 : varnish / varnish-modules (2022-0d5dcc031e)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.11, 7.1.2 or 7.2.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (211051). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Varnish

Name

• Cache

Version

• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.0.6
• 6.0.7
• 6.0.8
• 6.0.9
• 6.0.10
• 7.0
• 7.1
• 7.1.0
• 7.1.1
• 7.2.0

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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