Fuzzing Apache 2.4

Requirements

• honggfuzz
• clang-4.0, or newer (5.0 works as well)
• apache (e.g. 2.4.29 or from githubs' master branch)
• apr, apr-utils, nghttp2

Preparation

Note: The examples provided below use hardcoded paths (here to /home/$USER/) 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.asan.sh so it contains valid versions/paths

$ ./compile_and_install.asan.sh

5. Copy custom configuration files (httpd.conf.h1 and httpd.conf.h2) to /home/$USER/fuzz/apache/apache2/conf/ (i.e. to your apache dist directory)

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

6. Edit httpd.conf.h1 and httpd.conf.h2, so they contain valid configuration paths

Fuzzing

• HTTP/1

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

• HTTP/2

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