[Bro-Dev] [JIRA] (BIT-1238) High false-positive for application/x-tar signature

[Seth Hall (JIRA)]

     [ https://bro-tracker.atlassian.net/browse/BIT-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Seth Hall updated BIT-1238:
---------------------------

We’ve been meaning to write a test suite for our file signature matching because right now it’s hard to trust that we’re doing things correctly as we continue moving forward, but I never got around to it when I was making this set of changes unfortunately.


> High false-positive for application/x-tar signature
> ---------------------------------------------------
>
>                 Key: BIT-1238
>                 URL: https://bro-tracker.atlassian.net/browse/BIT-1238
>             Project: Bro Issue Tracker
>          Issue Type: Problem
>          Components: Bro
>    Affects Versions: 2.3
>            Reporter: Brian O'Berry
>            Assignee: Seth Hall
>              Labels: file, mime, signature
>             Fix For: git/master, 2.4
>
>         Attachments: test.tar.gz
>
>
> The following signature in base/frameworks/files/magic/general.sig frequently triggers on text files in our environment, and includes a strength value higher than GNU and POSIX tar signatures in libmagic.sig.
> {code}
> signature file-tar {
>     file-magic /([[:print:]\x00]){100}(([[:digit:]\x00\x20]){8}){3}/
>     file-mime "application/x-tar", 150
> }
> {code}



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