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CVE-2021-31251

Status Candidate

Overview

An authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining a privileged connection with the target device by supplying a specially malformed request and an attacker may force the remote telnet server to believe that the user has already authenticated.

Related Files

CHIYU IoT Telnet Authentication Bypass
Posted Jun 3, 2021
Authored by sirpedrotavares

Several IoT devices from the CHIYU Technology firm are vulnerable to a flaw that permits bypassing the telnet authentication process due to an overflow during the negotiation of the telnet protocol. Telnet authentication is bypassed by supplying a specially malformed request, and an attacker may force the remote telnet server to believe that the user has already authenticated. Several models are vulnerable, including BF-430, BF-431, BF-450M, and SEMAC with the most recent firmware versions.

tags | exploit, remote, overflow, protocol, bypass
advisories | CVE-2021-31251
SHA-256 | 781c1db46d4908a42a01a83b90b7f6c823afa8285764c401421aada6d4c0a9d1
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