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From "Hanson Char (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CODEC-134) Base32 would decode some invalid Base32 encoded string into arbitrary value
Date Sat, 03 Mar 2012 23:15:56 GMT
Base32 would decode some invalid Base32 encoded string into arbitrary value
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                 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


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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