[NT] Buffer Overflow in LeapFTP (Long HOST in lsq)

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  Buffer Overflow in LeapFTP (Long HOST in lsq)
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SUMMARY

 <http://www.leapware.com/> LeapFTP is the award-winning shareware FTP 
client that combines an intuitive interface with one of the most powerful 
client bases around.
By sending the malformed .lsq file to the victim, after the victim open 
the .lsq file, arbitray code may executed.

DETAILS

Vulnerable Systems:
 * LeapFTP versions lower than 2.7.6.612

LSQ is the LeapFTP Site Queue file, And it is registered with Windows by 
LeapFTP. You can save a transfer Queue to .lsq files and transfer it later 
by opening the .lsq files.
However, LeapFTP does not properly check the length of the "Host" fields, 
when a overly long string is supplied, there will be a buffer overflow and 
probably arbitrary code execution.

Proof of Concept Code:
//bof.lsq

[HOSTINFO]
HOST=AAAAA...[ long string ]...AAAAA
USER=username
PASS=password

[FILES]
"1","/winis/ApiList.zip","477,839","E:\ApiList.zip"

Solution:
All users are encouraged to upgrade to 2.7.6 immediately
Vendor also released an advisory at:  
<http://www.leapware.com/security/2005082301.txt> 
http://www.leapware.com/security/2005082301.txt

Vendor Status:
2005.08.22 Vendor notified via online WebForm
2005.08.23 Vendor responsed and bug fixed
2005.08.24 Vendor released the new version 2.7.6.612
2005.08.24 Advisory Released


ADDITIONAL INFORMATION

The information has been provided by Sowhat.
The original article can be found at:  
<http://secway.org/advisory/AD20050824.txt> 
http://secway.org/advisory/AD20050824.txt



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