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ACS Security Assessment Advisory - Format String Overflow

ID:       ACSSEC-2005-11-25 - 0x6

Class:    Format String Overflow
Package:  FTGate 4.4 [Build 4.4.000 Oct 26 2005] IMAPd Service
Build:    Windows NT/2k/XP/2k3
Notified: Dec 01, 2005
Released: Dec 20, 2005

Remote:   Yes
Severity: Low

Credit:   Tim Shelton          <security-advisories@acs-inc.com>
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-=[ Background

FTGate4 is a powerful Windows(TM) communication suite that combines 
exceptional mail handling facilities with comprehensive Groupware 
functionality. Its security and collaboration features were developed 
in conjunction with leading ISP's and define a new era in mail server 
performance.


-=[ Technical Description

FTGate 4.4 [Build 4.4.000 Oct 26 2005] is vulnerable to multiple format
string overflows via specially crafted imap requests. A remote attacker
could issue the vulnerable command followed by a malicious code to execute
arbitrary code.


-=[ Proof of Concepts

IMAP 01 LIST (%25n times 1024) *
IMAP 02 AUTHENTICATE (%25n times 1024) 

-=[ Solution
No remedy available as of December 2005.

-=[ Credits

Vulnerability originally reported by Tim Shelton


-=[ ChangeLog

2005-11-25 : Original Advisory
2005-12-01 : Notified Vendor
2005-12-20 : No response from vendor, disclosing full information.