SB2020040932 - Information disclosure in Varnish Cache

Description

This security bulletin contains information about 1 security vulnerability.

1) Information disclosure (CVE-ID: CVE-2019-20637)

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

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.

Remediation

Install update from vendor's website.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html
• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html
• http://varnish-cache.org/security/VSV00004.html#vsv00004