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CVE-2021-34685

Status Candidate

Overview

UploadService in Hitachi Vantara Pentaho Business Analytics through 9.1 does not properly verify uploaded user files, which allows an authenticated user to upload various files of different file types. Specifically, a .jsp file is not allowed, but a .jsp. file is allowed (and leads to remote code execution).

Related Files

Pentaho Business Analytics / Pentaho Business Server 9.1 Filename Bypass
Posted Nov 5, 2021
Authored by Altion Malka, Alberto Favero

Pentaho allows users to upload various files of different file types. The upload service is implemented under the /pentaho/UploadService endpoint. The file types allowed by the application are csv, dat, txt, tar, zip, tgz, gz, gzip. When uploading a file with an extension other than the allowed file types, the application responds with the error message of UploadFileServlet.ERROR_0011 - File type not allowed. Allowable types are csv,dat,txt,tar,zip,tgz,gz,gzip. However, the file extension check can be bypassed by including a single dot "." at the end of the filename.

tags | exploit, bypass
advisories | CVE-2021-34685
SHA-256 | 88d6bd09be7fc284d1910e9a75bbeb0651c9da3a240f985ed3f97efbddeb9345
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