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VuXML IDDescription
d9dbe6e8-84da-11e3-98bd-080027f2d077varnish -- DoS vulnerability in Varnish HTTP cache

Varnish Cache Project reports:

If Varnish receives a certain illegal request, and the subroutine 'vcl_error{}' restarts the request, the varnishd worker process will crash with an assert.

The varnishd management process will restart the worker process, but there will be a brief interruption of service and the cache will be emptied, causing more traffic to go to the backend.

We are releasing this advisory because restarting from vcl_error{} is both fairly common and documented.

This is purely a denial of service vulnerability, there is no risk of privilege escalation.

Workaround

Insert this at the top of your VCL file:

		sub vcl_error {
			if (obj.status == 400 || obj.status == 413) {
				return(deliver);
			}
		}

		Or add this test at the top of your existing vcl_error{}.

Discovery 2013-10-30
Entry 2014-01-25
varnish
< 3.0.5

CVE-2013-4484
https://www.varnish-cache.org/lists/pipermail/varnish-announce/2013-October/000686.html