[jira] Resolved: (TIKA-216) Zip bomb prevention

["Jukka Zitting (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TIKA-216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting resolved TIKA-216.
--------------------------------

    Resolution: Fixed

The basic zip bomb prevention mechanism is already included, so I'm resolving this as Fixed for the 0.4 release. The followup issue with droste.zip and similar specially crafted packages is filed as TIKA-259.

> Zip bomb prevention
> -------------------
>
>                 Key: TIKA-216
>                 URL: https://issues.apache.org/jira/browse/TIKA-216
>             Project: Tika
>          Issue Type: New Feature
>          Components: parser
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 0.4
>
>
> It would be good to have a mechanism that automatically detects a "zip bomb", i.e. a compressed document that expands to excessive amounts of extracted text. The classic example is the 42.zip file that's just 42kB in size, but expands to about 4 *petabytes* when all layers are fully uncompressed.
> A simple preventive measure could be a Parser decorator that counts the number of input bytes and the output characters, and fails with a TikaException when the ratio exceeds some configurable limit.
> As another preventive measure, the decorator could also keep track of the time (and perhaps even memory, if possible) it takes to process the input document. A TikaException would be thrown if processing time exceeds some configurable limit.

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