The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
********************************************
IHS Iran Homeland Security Public advisory
by : c0d3r "Kaveh Razavi" c0d3r (at) ihsteam (dot) com [email concealed]
********************************************
Title : Quick 'n Easy FTP Server pro/lite
Logging unicode stack overflow
********************************************
information :
Quick 'n Easy FTP Server is a simple and handy FTP server which is
developed by Pablo van der Meer . there is a unicode overflow in the
logging process ,after enough long string sent as an argument of a
command when you go to the logging section overflow happens and
SEH gets hit .
********************************************
simple exploitation :
it is a unicode overflow so any code execution wont be stable .
here is a sampe way to trigger the vulnerability :
login to the FTP Server then try :
command aaaaa < about 1100 a (0x61) here > aaaa
then in the ftp server main window go to Logging section .
the FTP Server will crash . and in the ftptrace.txt we have :
24/07/2006 20:41:53.500 Exception caught by MainExceptionHandler():
Exception : c0000005
Address : 00610061
Access Type : write
Access Address : 00000000
the amazing part is if your string was large enough the ftp server
detect overflow and prevents from any pointers overwrite .
********************************************
Risk Rate : Medium
1) it is a unicode overflow , and exploitation wont be stable because
of the vulnerability's nature .
2) successful exploitation needs the admin go to the logging section .
3) it needs authentication .
********************************************
workaround :
no patch , all targets are vulnerable.
********************************************
Disclosure timeline :
March 26 , 2006 : vender contacted
March 27 , 2006 : vender replyed *
March 27 , 2006 : vender contacted , example provided
March 28 , 2006 : vender replyed **
March 28 , 2006 : vender contacted , C code provided to test the vuln.
March 29 , 2006 : vender replyed ***
April 25 , 2006 : public release
* vender says I haven't applyed all the microsoft updates while I
have and of course an overflow issue in a software is not related
to microsoft libraries .
** vender is insisting that the problem is not the FTP problem and my
box problem .
*** I sent him a C code to check the vulnerability , he said he will
contact me . well he didn't .
********************************************
Credit :
all go to IHS team
www.ihsteam.com
www.ihsteam.net
www.c0d3r.org
greeting :
LorD and NT of IHS , Jamie of exploitdev.org ,
other friends of mine in www.underground.ir
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