[Bro-Dev] [JIRA] (BIT-1238) High false-positive for application/x-tar signature
Brian O'Berry (JIRA)
jira at bro-tracker.atlassian.net
Tue Jan 20 09:58:01 PST 2015
[ https://bro-tracker.atlassian.net/browse/BIT-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19505#comment-19505 ]
Brian O'Berry commented on BIT-1238:
------------------------------------
We'd love to contribute a test suite, if you're interested. Would you care to discuss your ideas and/or Bro requirements? We already have a process that we're using to compare file type identification between the Bro 2.2 magic db and the signatures from master (but running on 2.3.1).
> 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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