Varnish Cache up to 6.0.4 LTS/6.1.x/6.2.1/6.3.0 Pointer information disclosure

Summaryinfo

A vulnerability has been found in Varnish Cache up to 6.0.4 LTS/6.1.x/6.2.1/6.3.0 and classified as problematic. This vulnerability affects unknown code of the component Pointer Handler. Performing a manipulation results in information disclosure. This vulnerability is known as CVE-2019-20637. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Varnish Cache up to 6.0.4 LTS/6.1.x/6.2.1/6.3.0. It has been classified as problematic. This affects an unknown part of the component Pointer Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.1. It does not clear a pointer between the handling of one client request and the next request within the same connection. This sometimes causes information to be disclosed from the connection workspace, such as data structures associated with previous requests within this connection or VCL-related temporary headers.

The weakness was published 04/08/2020. This vulnerability is uniquely identified as CVE-2019-20637 since 04/08/2020. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 236666 (Alibaba Cloud Linux 3 : 0024: varnish:6 (ALINUX3-SA-2022:0024)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.5 LTS, 6.2.2 or 6.3.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236666). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Varnish

Name

• Cache

Version

• 6.0
• 6.0.4 LTS
• 6.1
• 6.2
• 6.2.0
• 6.2.1
• 6.3.0

CPE 2.3info

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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