| Título | Tenda TX9 V22.03.02.18 Stack-based Buffer Overflow |
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| Descrição | During a security review of the Tenda TX9 router firmware (version V22.03.02.18), a critical stack-based buffer overflow vulnerability was identified in the MAC filtering configuration endpoint /goform/setMacFilterCfg.
The vulnerability resides in the sub_423B50 function (responsible for parsing MAC filter rules). This function is triggered when a user submits a configuration request via the deviceList parameter. The function uses strchr to locate a carriage return character (\r, ASCII 13) within the user-provided string. Once found, it employs the unsafe strcpy function to copy the split substrings into a fixed-size stack buffer v15 (160 bytes). Since the length of the input strings is not validated before the copy operation, an attacker can provide a specially crafted long string to overwrite the stack frame, including the return address, leading to a Denial of Service (DoS) or potential Remote Code Execution (RCE). |
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| Fonte | ⚠️ https://github.com/LX-66-LX/cve-new/issues/9 |
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| Utilizador | LX-66-LX (UID 92717) |
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| Submissão | 31/01/2026 13h41 (há 3 meses) |
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| Moderação | 07/02/2026 18h20 (7 days later) |
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| Estado | Duplicado |
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| Entrada VulDB | 344775 [Tenda TX9 até 22.03.02.10_multi /goform/setMacFilterCfg sub_4223E0 deviceList Excesso de tampão] |
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| Pontos | 0 |
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