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From "Hanson Char (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (CODEC-134) Base32 would decode some invalid Base32 encoded string into arbitrary value
Date Sun, 04 Mar 2012 23:48:59 GMT

    [ https://issues.apache.org/jira/browse/CODEC-134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222063#comment-13222063
] 

Hanson Char edited comment on CODEC-134 at 3/4/12 11:47 PM:
------------------------------------------------------------

patch.txt attached
                
      was (Author: hchar):
    Sorry, should have attached the patch as a file.
                  
> Base32 would decode some invalid Base32 encoded string into arbitrary value
> ---------------------------------------------------------------------------
>
>                 Key: CODEC-134
>                 URL: https://issues.apache.org/jira/browse/CODEC-134
>             Project: Commons Codec
>          Issue Type: Bug
>    Affects Versions: 1.6
>         Environment: All
>            Reporter: Hanson Char
>              Labels: security
>         Attachments: patch.txt
>
>
> Example, there is no byte array value that can be encoded into the string "C5CYMIHWQUUZMKUGZHGEOSJSQDE4L===",
but the existing Base32 implementation would not reject it but decode it into an arbitrary
value which if re-encoded again using the same implementation would result in the string "C5CYMIHWQUUZMKUGZHGEOSJSQDE4K===".
> Instead of blindly decoding the invalid string, the Base32 codec should reject it (eg
by throwing IlleglArgumentException) to avoid security exploitation (such as tunneling additional
information via seemingly valid base 32 strings).

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