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From "Hanson Char (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CODEC-134) Base32 would decode some invalid Base32 encoded string into arbitrary value
Date Tue, 06 Mar 2012 04:29:04 GMT

    [ https://issues.apache.org/jira/browse/CODEC-134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222988#comment-13222988
] 

Hanson Char commented on CODEC-134:
-----------------------------------

Hi Gary,

Please try the latest patch diff-120305-20.txt, which seems to work for me when I applied
it to the trunk.  (BTW, this latest patch is simply made by running dos2unix to the previous
patch.  I suspect this dos2unix trick may also work for you in other cases should you encountered
similar patch "compatibility" problem.)

Regards,
Hanson
                
> 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: diff-120305-20.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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