[jira] Commented: (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:comment-tabpanel&focusedCommentId=12718184#action_12718184 ] 

Jukka Zitting commented on TIKA-216:
------------------------------------

For the record, see a similar issue in the Aperture project:
http://sourceforge.net/tracker/?func=detail&aid=2786554&group_id=150969&atid=779500

> 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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