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