A researcher has discovered over 100 vulnerabilities in building management and access control systems from four major vendors. An attacker can exploit these flaws to gain full control of impacted products and manipulate the systems connected to them.
Roughly one year ago, Gjoko Krstic, a researcher at industrial cybersecurity firm Applied Risk, started analyzing building management (BMS), building automation (BAS) and access control products from Nortek, Prima Systems, Optergy, and Computrols. The products include Computrols CBAS-Web, Optergy Proton/Enterprise, Prima FlexAir, and two Nortek Linear eMerge products.
Krstic has identified a total of over 100 security holes in these systems to which nearly 50 CVE identifiers have been assigned; some of the issues are variations of the same flaw.
The vulnerabilities include default and hardcoded credentials, command injection, cross-site scripting (XSS), path traversal, unrestricted file upload, privilege escalation, authorization bypass, clear-text storage of passwords, cross-site request forgery (CSRF), arbitrary code execution, authentication bypass, information disclosure, open redirect, user enumeration, and backdoors.
The flaws, many of which have been classified as “critical,” can allow an unauthenticated attacker — either on their own or by being chained with other vulnerabilities — to take full control of the impacted systems.
Krstic summarized his findings last month at SecurityWeek’s ICS Cyber Security Conference in Singapore and Applied Risk has now published advisories for each of the impacted products. The company expects to release a full research paper, which includes technical details, in June.
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Krstic said during his presentation that the flaws could impact up to 10 million people and 30,000 doors at 200 facilities; the estimate is based on product documentation and online information.
He said an attacker can conduct a wide range of activities after hijacking the vulnerable systems, including trigger alarms, lock or unlock doors and gates, control elevator access, intercept video surveillance streams, manipulate HVAC systems and lights, disrupt operations, and steal personal information.
A Shodan search revealed over 2,500 systems that are directly exposed to the internet, many made by Nortek. Krstic told SecurityWeek in an interview that the exposed buildings include a famous monument and a major financial organization, both in the United States.
All of the impacted vendors released patches for their products after being notified by Applied Risk, except for Nortek, which appears to have a poor process for reporting vulnerabilities. The company at one point told SecurityWeek that the issues identified by Applied Risk had already been patched, despite the company not receiving the actual details of the flaws — Applied Risk said it did not receive a response from Nortek after requesting a PGP key.
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