Kaspersky Small Office Security 13.0.4.233 Unsalted Hash

2015-10-01T00:00:00
ID PACKETSTORM:133804
Type packetstorm
Reporter Matthias Deeg
Modified 2015-10-01T00:00:00

Description

                                        
                                            `-----BEGIN PGP SIGNED MESSAGE-----  
Hash: SHA512  
  
Advisory ID: SYSS-2015-004  
Product: Kaspersky Small Office Security (KSOS)  
Vendor: Kaspersky Lab ZAO  
Affected Version(s): 13.0.4.233  
Tested Version(s): 13.0.4.233  
Vulnerability Type: Use of a One-Way Hash without a Salt (CWE-759)  
Risk Level: Low  
Solution Status: Fixed  
Vendor Notification: 2015-02-19  
Solution Date: 2015-10-01  
Public Disclosure: 2015-10-01  
CVE Reference: Not yet assigned  
Authors of Advisory: Matthias Deeg and Sven Freund (SySS GmbH)  
  
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Overview:  
  
Kaspersky Small Office Security is an endpoint protection software  
with many features like malware protection, defences against phishing  
attacks and exploits, data encryption and data backup functionality.  
  
The vendor Kaspersky describes the product as follows (see [1]):  
  
"Kaspersky Small Office Security delivers business-grade protection   
technologies that are designed to be simple to install, configure and  
run. The solution protects your Windows-based PCs & file servers and   
Android smartphones and tablets to safeguard your online banking  
transactions, your business data and the information your customers  
entrust to you."  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Vulnerability Details:  
  
The SySS GmbH found out that the administrator password for protecting  
different functions of the Kaspersky Small Office Security software,  
like managing backups or stopping protection services, is stored as  
raw, unsalted MD5 hash value in the Windows registry.  
  
The used registry value  
  
"HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KasperskyLab\protected\KSOS13\settings\OPEP"  
  
is by default readable by every user.  
  
The use of the cryptographic one-way hash function MD5 without using a   
salt for storing sensitive data like admin passwords allows an attacker  
with access to this data to perform efficient password guessing attacks  
using pre-computed dictionaries, for instance rainbow tables.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Proof of Concept (PoC):  
  
The configured admin password is stored as raw, unsalted MD5 hash value  
of the UTF-16 (wide char) string representation of the set password.  
  
For instance, it can be read using the following command:  
  
C:\Users\SySS>reg query HKLM\SOFTWARE\Wow6432Node\KasperskyLab\protected\KSOS13\settings /v OPEP  
  
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KasperskyLab\protected\KSOS13\settings  
OPEP REG_SZ CFB37E7C04BEA837D23005199B1CD62B  
  
  
The read string in this example is a raw, unsalted MD5 hash value of the  
UTF-16 string "syss", as the following output illustrates:  
  
$ echo -en "s\x00y\x00s\x00s\x00" | md5sum  
cfb37e7c04bea837d23005199b1cd62b -  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Solution:  
  
According to information by Kaspersky, the described security issue has  
been fixed in newer software releases.  
  
Please contact the manufacturer for further information or support.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Disclosure Timeline:  
  
2015-02-19: Vulnerability reported to manufacturer  
2015-02-19: Manufacturer acknowledges e-mail with SySS security advisory   
2015-03-17: Rescheduling of the publication date in agreement with the  
manufacturer  
2015-04-14: Rescheduling of the publication date in agreement with the  
manufacturer  
2015-09-28: SySS asks for further information about software fix  
2015-10-01: Public release of security advisory on agreed publication  
date  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
References:  
  
[1] Product Web site for Kaspersky Small Office Security  
http://www.kaspersky.com/small-office-security  
[2] SySS Security Advisory SYSS-2015-004  
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2015-004.txt  
[3] SySS Responsible Disclosure Policy  
https://www.syss.de/en/news/responsible-disclosure-policy/  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Credits:  
  
This security vulnerability was found by Matthias Deeg and Sven Freund  
of the SySS GmbH.  
  
E-Mail: matthias.deeg (at) syss.de  
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Matthias_Deeg.asc  
Key fingerprint = D1F0 A035 F06C E675 CDB9 0514 D9A4 BF6A 34AD 4DAB  
  
E-Mail: sven.freund (at) syss.de  
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Sven_Freund.asc  
Key fingerprint = DCDB 7627 C1E3 9CE8 62DF 2666 8A5F A853 415D 46DC  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Disclaimer:  
  
The information provided in this security advisory is provided "as is"   
and without warranty of any kind. Details of this security advisory may   
be updated in order to provide as accurate information as possible. The  
latest version of this security advisory is available on the SySS Web   
site.  
  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
  
Copyright:  
  
Creative Commons - Attribution (by) - Version 3.0  
URL: http://creativecommons.org/licenses/by/3.0/deed.en  
  
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