Multiple integer overflows in Borland StarTeam server 10.0.0.57

2008-03-0300:00:00

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                         Luigi Auriemma

Application: Borland StarTeam server 2008
http://www.borland.com/starteam/
Versions: <= 10.0.0.57
Platforms: Windows
Bugs: multiple integer overflows
Exploitation: remote
Date: 02 Mar 2008
Author: Luigi Auriemma
e-mail: [email protected]
web: aluigi.org

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1) Introduction
2) Bugs
3) The Code
4) Fix

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1) Introduction

From vendor's website:
"Borland® StarTeam® is a fully integrated, cost-effective software
change and configuration management tool, designed for both centralized
and geographically distributed software development environments."

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2) Bugs

The server is affected by multiple integer overflow vulnerabilities
caused by the calculation of the amount of memory it needs to allocate
for some arrays received from the clients.

The main ways I have found for exploiting these vulnerabilities are
through the PROJECT_LOGIN and SET_SERVER_ACL commands where the 32 bit
number received from the client which specifies the amount of entries
in the packet is multiplicated respectively for 8 (or 4 depending by
the folder names or specifications) and 12, the result is then used for
allocating the memory without considering the 32 bit limit.

The effect of this operation is a heap overflow which allows an
attacker to control some registers and could exist a possibility of
executing malicious code.

For both the ways is necessary to have a valid account, privileges are
not necessary so the less privileged one is good too.

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