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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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