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Date: Sat, 12 Nov 2016 09:39:45 +0100
From: Ondřej Surý <>
 Debian Security Team <>,
 Dariusz Dwornikowski <>,
 Sam Trenholme <>
Subject: Remote crash in MaraDNS 2.0.13 and git master


while playing with fuzzing the DNS servers with AFL (2.35b) I found a
remote crash bug in MaraDNS 2.0.13 js_readuint16. It can be also
reproduced using master branch.

Attached is patch to allow the fuzzing (it overrides getudp() with
read(0, ..)), the input data that crashes MaraDNS, and the bt full

Please assign CVE, I would provide a patch, but MaraDNS code is
extremely hard to navigate for me, so I'll leave the fix for the code

AFL has finished only 1 cycle (and found the 1 unique crash), so I'll
keep it running for a while.

Ondřej Surý <>
Knot DNS ( – a high-performance DNS server
Knot Resolver ( – secure, privacy-aware,
fast DNS(SEC) resolver
Vše pro chleba ( – Mouky ze mlýna a potřeby pro
pečení chleba všeho druhu

Download attachment "maradns.btfull" of type "application/octet-stream" (3678 bytes)

View attachment "allow-fuzzing.patch" of type "text/x-patch" (1799 bytes)

Download attachment "id:000000,sig:11,src:007564,op:havoc,rep:32" of type "application/octet-stream" (23 bytes)

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