Falhas do tipo CWE-434

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Upload irrestrito de arquivo com tipo perigoso

A aplicação aceita upload de arquivos sem validar adequadamente o tipo ou extensão, permitindo que um atacante envie executáveis, scripts ou outros arquivos maliciosos que serão armazenados ou executados no servidor. O risco aumenta se o arquivo for salvo em diretório acessível pela web ou em local onde será processado automaticamente.

Exemplo

Um sistema de upload de 'fotos de perfil' verifica apenas o tamanho do arquivo, mas não valida a extensão. Um atacante envia um arquivo .php disfarçado de imagem; se salvo em /uploads/ acessível via web, ele consegue executar código PHP no servidor ao acessar a URL direta.

Como mitigar

Valide extensões contra uma lista branca (whitelist) de tipos permitidos, verifique a assinatura do arquivo (magic bytes) e não confie apenas no Content-Type do cliente. Armazene uploads fora do diretório web ou configure o servidor para não executar scripts no diretório de uploads.

CVE-2024-43656CRITICALA backup can be manipulated and then restored to create arbitrary files inside the <redacted> directory. A CGI script can be added to the web directory this way, allowing for full remote code execution.EPSS 1.5%CVE-2022-1034CRITICALThere is a Unrestricted Upload of File vulnerability in ShowDoc v2.10.3 in star7th/showdocEPSS 1.5%CVE-2013-10047CRITICALMiniWeb <= Build 300 Arbitrary File UploadEPSS 1.5%CVE-2026-32985CRITICALXerte Online Toolkits <= 3.14 Unauthenticated Template Import Arbitrary File Upload Leading to Remote Code ExecutionEPSS 1.5%CVE-2024-28105HIGHphpMyFAQ's File Upload Bypass at Category Image Leads to RCEEPSS 1.5%CVE-2021-4080HIGHUnrestricted Upload of File with Dangerous Type in crater-invoice/craterEPSS 1.5%CVE-2022-1273—Import WP < 2.4.6 - Admin+ Arbitrary File Upload to RCEEPSS 1.5%CVE-2024-54262CRITICALWordPress Import Export For WooCommerce plugin <= 1.6.2 - Arbitrary File Upload vulnerabilityEPSS 1.5%CVE-2024-43657CRITICALWhen uploading new firmware, a shell script inside a firmware file is executed during its processing. This can be used to craft a custom firmware file with a custom script with arbitrary code, which will then be executed on the charging station.EPSS 1.5%CVE-2023-26578HIGHArbitrary File Upload to Web Root In IDAttend’s IDWeb ApplicationEPSS 1.5%CVE-2022-0687—Amelia < 1.0.46 - Manager+ RCEEPSS 1.5%CVE-2024-27311MEDIUMArbitrary file writingEPSS 1.5%CVE-2022-41437HIGHBilling System Project v1.0 was discovered to contain a remote code execution (RCE) vulnerability via the component /php_action/createProducEPSS 1.5%CVE-2024-37762CRITICALMachForm up to version 21 is affected by an authenticated unrestricted file upload which leads to a remote code execution.EPSS 1.5%CVE-2022-36386CRITICALWordPress Import any XML or CSV File to WordPress plugin <= 3.6.7 - Authenticated Arbitrary Code Execution vulnerabilityEPSS 1.5%CVE-2020-22151—Permissions vulnerability in Fuel-CMS v.1.4.6 allows a remote attacker to execute arbitrary code via a crafted zip file to the assests paramEPSS 1.5%CVE-2025-66480CRITICALWildfire has Arbitrary File Upload via Directory Traversal in UploadFileActionEPSS 1.5%CVE-2022-1409—VikBooking Hotel Booking Engine & PMS < 1.5.8 - Admin+ PHP File UploadEPSS 1.4%CVE-2022-1939—Allow SVG Files < 1.1 - Admin+ Arbitrary File UploadEPSS 1.4%CVE-2021-25119—AGIL <= 1.0 - Admin+ Arbitrary File UploadEPSS 1.4%