| Título | Totolink A3300R 17.0.0cu.557_b20221024 Command Injection |
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| Descrição | The vulnerability resides in the router's shttpdweb service. A remote attacker can exploit this flaw to execute arbitrary operating system commands on the device by sending a specially crafted HTTP request, which could lead to a complete compromise. The overall vulnerability trigger flow is illustrated in the provided diagram: .
The technical root cause is the unsafe handling of user input within the firmware's code. The detailed exploit chain is as follows:
1.Malicious Input Entry Point: The attack begins when a user-controlled parameter named "rxRate" is processed. The function sub_41811C reads the value provided by the attacker in the request, as shown in the code screenshot: .
2.Unsafe Command Construction: The value of the "rxRate" parameter is then directly inserted into a command buffer (v11) using the snprintffunction without proper sanitization .
3.Arbitrary Command Execution: This constructed command string is subsequently passed to the CsteSystem function, where it is executed via the execv() system call. |
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| Fonte | ⚠️ https://github.com/LvHongW/Vuln-of-totolink_A3300R/tree/main/A3300R_rxRate_cmd_inject |
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| Utilizador | LvHW (UID 96399) |
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| Submissão | 13/03/2026 03h48 (há 27 dias) |
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| Moderação | 30/03/2026 20h53 (18 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 354245 [Totolink A3300R 17.0.0cu.557_b20221024 /cgi-bin/cstecgi.cgi setWiFiBasicCfg rxRate Elevação de Privilégios] |
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| Pontos | 20 |
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