[USN-5474-1] Varnish Cache vulnerabilities


========================================================================== Ubuntu Security Notice USN-5474-1 June 08, 2022
varnish vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 22.04 LTS – Ubuntu 21.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in Varnish Cache.
Software Description: – varnish: state of the art, high-performance web accelerator
Details:
It was dicovered that Varnish Cache did not clear a pointer between the handling of one client request and the next request within the same connection. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2019-20637)
It was discovered that Varnish Cache could have an assertion failure when a TLS termination proxy uses PROXY version 2. A remote attacker could possibly use this issue to restart the daemon and cause a performance loss. (CVE-2020-11653)
It was discovered that Varnish Cache allowed request smuggling and VCL authorization bypass via a large Content-Length header for a POST request. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2021-36740)
It was discovered that Varnish Cache allowed request smuggling for HTTP/1 connections. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2022-23959)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 22.04 LTS: libvarnishapi2 6.6.1-1ubuntu0.2 varnish 6.6.1-1ubuntu0.2
Ubuntu 21.10: libvarnishapi2 6.5.2-1ubuntu0.2 varnish 6.5.2-1ubuntu0.2
Ubuntu 20.04 LTS: libvarnishapi2 6.2.1-2ubuntu0.1 varnish 6.2.1-2ubuntu0.1
Ubuntu 18.04 LTS: libvarnishapi1 5.2.1-1ubuntu0.1 varnish 5.2.1-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5474-1 CVE-2019-20637, CVE-2020-11653, CVE-2021-36740, CVE-2022-23959
Package Information: launchpad.net/ubuntu/+source/varnish/6.6.1-1ubuntu0.2 launchpad.net/ubuntu/+source/varnish/6.5.2-1ubuntu0.2 launchpad.net/ubuntu/+source/varnish/6.2.1-2ubuntu0.1 launchpad.net/ubuntu/+source/varnish/5.2.1-1ubuntu0.1