[jira] [Resolved] (KNOX-3418) Path traversal → arbitrary file write/overwrite in the Apache Knox Admin API

["Tamás Hanicz (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KNOX-3418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tamás Hanicz resolved KNOX-3418.
--------------------------------
    Fix Version/s: 2.1.1
                       (was: 3.1.0)
       Resolution: Fixed

> Path traversal → arbitrary file write/overwrite in the Apache Knox Admin API
> ----------------------------------------------------------------------------
>
>                 Key: KNOX-3418
>                 URL: https://issues.apache.org/jira/browse/KNOX-3418
>             Project: Apache Knox
>          Issue Type: Bug
>          Components: Server
>    Affects Versions: 2.1.0, 3.0.0
>            Reporter: Tamás Hanicz
>            Assignee: Tamás Hanicz
>            Priority: Blocker
>             Fix For: 3.0.0, 2.1.1
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Reported by greybtw
>  
> Path traversal in the Knox Admin API resource-management endpoints (PUT /admin/api/v1/\{providerconfig,descriptors,topologies}/\{name}). The client-supplied resource name is URL-decoded and validated against RESOURCE_NAME_PATTERN = ^[\w-/.]+$, whose character class admits / and . (the - is literal), so a ../ traversal passes validation. The decoded name is then written via new File(dest, name) + FileUtils.writeStringToFile with no canonical-path containment check, so an authenticated admin-role user can write/overwrite a file outside the managed shared-providers/descriptors/topologies directories, with an attacker-chosen filename and extension (getFileNameForResource keeps the name verbatim when it already has a .)



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