USN-5474-1: Varnish Cache vulnerabilities

Releases

• Ubuntu 22.04 LTS
• Ubuntu 21.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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

• varnish - 6.6.1-1ubuntu0.2
• libvarnishapi2 - 6.6.1-1ubuntu0.2

Ubuntu 21.10

• varnish - 6.5.2-1ubuntu0.2
• libvarnishapi2 - 6.5.2-1ubuntu0.2

Ubuntu 20.04

• varnish - 6.2.1-2ubuntu0.1
• libvarnishapi2 - 6.2.1-2ubuntu0.1

Ubuntu 18.04

• varnish - 5.2.1-1ubuntu0.1
• libvarnishapi1 - 5.2.1-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References

• CVE-2021-36740
• CVE-2019-20637
• CVE-2022-23959
• CVE-2020-11653

Related notices

• USN-5474-2: libvarnishapi2, varnish, varnish-doc, libvarnishapi-dev