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The LD_PRELOAD deception module

The prototype has two capabilities implemented:

  • response-code deception: Overwrites the status code in HTTP responses, e.g., replaces the original status with 200 OK. This modification can further be conditioned to only modify responses to requests for certain URLs.
  • http-header deception: Replaces a header attribute in HTTP responses, e.g., replaces the Server header with a seemingly vulnerable Apache/1.0.3 (Debian) value. Note that the overwritten text will be padded with spaces to the length of the original header field.

Demonstration

Limitations

The prototype should work for the following applications:

  • Applications that rely on libc to send and receive network packets
  • Applications that send HTTP/1.0 or HTTP/1.1 packets
  • Applications that are written in Java and Python

Deployment

Add the compiled deception.so to your filesystem and point LD_PRELOAD to its path. See the examples for more. If you need to build the shared library, run the following:

make

Format your code by running

make clang

Clean-up the build with

make clean

Example with jdkelley/simple-http-server

We use jdkelley/simple-http-server as representative example for a simple HTTP server, written in Java. This application just serves any directory mounted to /serve. To start the server normally, run:

docker run --rm -p 80:8000 -v ${PWD}:/serve jdkelley/simple-http-server:latest

To start it with the deception module, run the following:

docker run --rm -p 80:8000 \
    -v ${PWD}:/serve \
    -v ${PWD}/../bin/mount/deception.so:/opt/deception.so \
    -v ${PWD}/../bin/mount/honeyaml.yaml:/var/opt/honeyaml.yaml \
    -v ${PWD}/../bin/mount/deception.log:/var/log/deception.log \
    -e LD_PRELOAD="//opt/deception.so" \
    jdkelley/simple-http-server:latest

Possibly modify the paths to point to your compiled shared library.

Internal notes

The high-level architecture of the prototype is roughly as follows.

High-level architecture