July 5, 2016 Karn Ganeshen

[ICS] RS232-NET Converter (model JTC-200) – Multiple vulnerabilities

RS232-NET Converter (model JTC-200) – Multiple vulnerabilities

About RS232-NET Converter (model JTC-200)
Seen deployed in:
  • CHTD, Chunghwa Telecom Co., Ltd. (Taiwan)
  • HiNet (Taiwan & China)
  • PT Comunicacoes (Portugal)
  • Sony Network Taiwan Limited (Taiwan)
  • Vodafone Portugal (Portugal)
VULNERABILITY DETAILS
1. Weak Credential Management

The RS232-NET Converter (model JTC-200) web administration interface uses non-random default credentials of admin:1234. The application does not enforce a mandatory password change. A network-based attacker can gain privileged access to a vulnerable device’s web management interfaces or leverage default credentials in remote attacks such as cross-site request forgery.

2. Unauthenticated access over Telnet (Backdoor shell)

The RS232-NET Converter (model JTC-200) provides (undocumented) Busybox linux shell over Telnet service – without any authentication. This backdoor shell therefore gives direct access to the internal network, over the Internet.

Busybox shell offers pretty restricted set of allowed functions but it is still possible to perform enumeration.
192.168.5.x -> real ip

3. Cross-Site Request Forgery (CSRF)
The RS232-NET Converter (model JTC-200) contains a global CSRF vulnerability. An attacker can perform actions with the same permissions as a victim user, provided the victim has an active session and is induced to trigger the malicious request. Note that in combination with default credentials, an attacker can establish an active session as part of an attack and therefore would not require a victim to be logged in.
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