| Título | Tenda CH22 V1.0.0.1 Authentication Bypass Issues |
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| Descrição | A critical authentication bypass vulnerability exists in the CH22 V1.0.0.1 firmware. The vulnerability is located in the R7WebsSecurityHandler function, which acts as the security filter for HTTP requests. The application defines a whitelist of URL prefixes (e.g., /public/, /lang/, /images/) that are allowed to be accessed without authentication. The function uses strncmp to check if the request URL begins with these trusted prefixes: e.g., if ( !strncmp(s1, "/public/", 8u) ... return 0;.
However, the application fails to validate or canonicalize the subsequent part of the URL. An unauthenticated remote attacker can send a crafted HTTP request that starts with a whitelisted prefix but employs directory traversal sequences (../) to escape the restricted directory. For example, a request to /public/../../system_upgrade.asp will satisfy the strncmp check (bypassing authentication) but will be resolved by the web server to the sensitive system_upgrade.asp page, granting full administrative access. |
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| Fonte | ⚠️ https://github.com/master-abc/cve/blob/main/Tenda%20CH22%20V1.0.0.1%20Router%20Authentication%20Bypass%20Vulnerability%20in%20R7WebsSecurityHandler%20function.md |
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| Utilizador | jiefengliang (UID 93721) |
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| Submissão | 22/12/2025 09h48 (há 10 meses) |
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| Moderação | 24/12/2025 17h54 (2 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 338333 [Tenda CH22 1.0.0.1 /public/ Travessia de Diretório] |
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| Pontos | 20 |
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