Fuzzing Apache 2.4

Requirements

• honggfuzz (1.0 or from the master branch)
• clang-4.0, or newer (5.0 works as well)
• apache (e.g.: 2.4.25 or the master branch from git)

Preparation

Note: The examples provided below use hardcoded paths (here to /home/swiecki/) and version strings of the libraries (e.g. apr-1.5.2). These will have to be modified, so they reflect your actual build environment.

1. Compile honggfuzz
2. Download and unpack the following packages: apr, apr-util, ngttp2, and Apache's httpd
3. Patch Apache's httpd

$ cd httpd-master
$ patch -p1 < httpd-master.honggfuzz.patch

4. Configure, compile and install Apache

• edit compile_and_install.sh to contain valid versions/paths

$ ./compile_and_install.sh

5. Copy the custom configuration files to /home/swiecki/fuzz/apache/apache2/conf/ (i.e. to your apache dist directory)

$ cp httpd.conf.h1 httpd.conf.h2 /home/swiecki/fuzz/apache/apache2/conf/

Fuzzing

• HTTP/1

$ honggfuzz/honggfuzz -P -f corpus_http1 -w ./httpd.wordlist -- ./apache2/bin/httpd -DFOREGROUND -f  /home/swiecki/fuzz/apache/apache2/conf/httpd.conf.h1

• HTTP/2

$ honggfuzz/honggfuzz -P -f corpus_http2 -w ./httpd.wordlist -- ./apache2/bin/httpd -DFOREGROUND -f /home/swiecki/fuzz/apache/apache2/conf/httpd.conf.h2