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Date: Thu, 29 Sep 2016 17:04:03 +0200
From: Hanno Böck <>
Subject: Re: [SECURITY ADVISORY] c-ares: single byte out of
 buffer write


Just quick:
This is a very typical bug class that libfuzzer can find very well.
libfuzzer is like afl, but for functions instead of executables.

I have attached a sample code for libfuzzer which shows how this works.
(In case anyone cares: Consider it being public domain / CC0 / whatever
licensing terms you like)

Takes only a few seconds without any starting corpus to find this bug.

Hanno Böck

GPG: FE73757FA60E4E21B937579FA5880072BBB51E42

View attachment "libfuzzer-ares_create_query.cpp" of type "text/x-c++src" (434 bytes)

Content of type "application/pgp-signature" skipped

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