| Título | DrayTek Vigor2960 Vigor2960 1.5.1.6 (revision 8218) Authenticated app_guest_export Path Traversal Write/Read/Delete |
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| Descrição | app_guest_export appends the user-controlled filename to /tmp/profile_backup/app_guest_setup/ without verifying, after path normalization, that the target remains inside that directory. The current PoC uses ../../../../www/portal/abcd_export_22157.csv and confirms that the handler generates a CSV at the traversed path, streams its contents in the HTTP response, and deletes the same path.
Affected interface: POST /cgi-bin/mainfunction.cgi with action=app_guest_export
Attacker-controlled parameter: filename
Confirmed impact: an authenticated attacker can select an unexpected CSV export path and trigger write, read-back, and deletion of that path.
## Vendor Confirmation
The vulnerability has been officially confirmed. The email is available at: https://github.com/yikesoftware/DrayTek_Vigor2960_Security_Analysis/tree/main/vendor_confirm
The official fix for this vulnerability has been released: https://fw.draytek.com.tw/Vigor2960/Firmware/v1.5.1.7/Vigor2960_v1.5.1.7.zip |
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| Fonte | ⚠️ https://github.com/yikesoftware/DrayTek_Vigor2960_Security_Analysis/tree/main/cases/DRV2960-0017-authenticated-app-guest-export-path-traversal-write-delete |
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| Utilizador | eqqie (UID 101441) |
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| Submissão | 20/10/2026 08h14 (há 26 dias) |
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| Moderação | 14/11/2026 19h12 (25 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 437462 [DrayTek Vigor2960 até 1.5.1.6 mainfunction.cgi app_guest_export filename Travessia de Diretório] |
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| Pontos | 20 |
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