Seeing as how, given a large enough buffer, it is relatively easy to
write arbitrary shell code using just ASCII characters, the larger
unicode space would make this even easier. Unless there are some
pretty severe unlisted restrictions on either the length or content of
the overflow string, making an exploit is practically trivial.
If you want a quick'n'dirty overview of shell code using a very
limited subset of ASCII you can refer to the lecture notes from a unix
security class I took in Fall 2004 (starting on page 5 of this
document): http://cr.yp.to/2004-494/0910.pdf
-D
On 8/24/05, Kaveh Razavi <c0d3rz_team@yahoo.com> wrote:
it is not a high risk vulnerability .
chance of making an stable exploit in a unicode
overflow is low .
Regards
c0d3r of IHS
Network Security Reseacher
LeapFTP .lsq Buffer Overflow Vulnerability
by Sowhat
Last Update:2005.08.24
http://secway.org/advisory/AD20050824.txt
Vendor:
LeapWare Inc.
Product Affected:
LeapFTP < 2.7.6.612
Overview:
LeapFTP is the award-winning shareware FTP client
that combines an
intuitive interface with one of the most powerful
client bases around.
Details:
.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.
This vulnerability can be exploited by sending the
malformed .lsq file
to the victim, after the victim open the .lsq file,
arbitray code may
executed.
//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:
http://www.leapware.com/security/2005082301.txt
Vendor Response:
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
';" type="text/css">
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