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C2Box 4.0.0(r19171) Validation Bypass

C2Box 4.0.0(r19171) Validation Bypass
Posted Mar 28, 2016
Authored by Harish Ramadoss

C2Box versions 4.0.0(r19171) and below suffer from a validation bypass vulnerability.

tags | exploit, bypass
advisories | CVE-2015-4626
SHA-256 | bc375d41b3055dd7d57b4dcb888c8376a80e14b7eb5b23111b255db7bf853cad

C2Box 4.0.0(r19171) Validation Bypass

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Title: Validation Bypass in C2Box application allows user to input negative value
Author: Harish Ramadoss
Vendor: boxautomation(B.A.S)
Product: C2Box
Version: All versions below 4.0.0(r19171)
Tested Version: Version 4.0.0(r19171)
Severity: Medium
CVE Reference: 2015-4626

# About the Product:
B.A.S C2Box provides global solutions enabling full control and visibility over cash positions and managing domestic or cross border payment processes.

# Description:
Performing validation in client side code, generally JavaScript, provides no protection for server-side code. An attacker can simply disable JavaScript use a security testing proxy such as BurpSuite to bypass the client side validation. Invalidated input might corrupt business logic.

# Vulnerability Class:
Unvalidated Input - https://www.owasp.org/index.php/Unvalidated_Input

# How to Reproduce: (POC):
While creating an overdraft using the overdraft editor form on C2Box application disable JavaScript to disable client side validation and the value can be intercepted using a proxy and negative value can be inserted corrupting the business logic.

# Disclosure:
Discovered: June 10, 2015
Vendor Notification: June 10, 2015
Advisory Publication: Mar 28, 2016
Public Disclosure: Mar 28, 2016

# Solution:
Upgrade to the latest Build will fix this issue.
The new version number is 15.6.22
Release date: June 22, 2015

# credits:
Harish Ramadoss
Senior Security Analyst
Help AG Middle East

#References:
[1] help AG middle East http://www.helpag.com/.
[2] http://www.boxautomation.com/.
[3] https://www.owasp.org/index.php/Unvalidated_Input
[4] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
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