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source: http://www.securityfocus.com/bid/37713/info Varnish is prone to a command-injection vulnerability because it fails to adequately sanitize user-supplied input in logfiles. Attackers can exploit this issue to execute arbitrary commands in a terminal. Varnish 2.0.6 is vulnerable; other versions may also be affected. The following example is available: echo -en "GET /\x1b]2;owned?\x07\x0a\x0d\x0a\x0d" > payload nc localhost 80 < payload