http://issues.apache.org/SpamAssassin/show_bug.cgi?id=5553
Summary: MIME_BASE64_TEXT does not handle charset properly
Product: Spamassassin
Version: 3.2.1
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P5
Component: Plugins
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
MIME_BASE64_TEXT is intended to fire on "text disguised using base64
encoding"; however, MIME_BASE64_TEXT does not properly handle MIME
charset rules. The fix for bug 4687 corrects the problem for big5,
but does not solve the general case.
MIME_BASE64_TEXT should fire on base64 encoded messages where the
original encoding is a 7bit character set. The most common 7bit
character set is US-ASCII, and that's also the default character set
for MIME messages if no charset has been explicitly set.
A bug fix which modifies the charset handling in _check_mime_header of
MIMEEval.pm is attached. This patch modifies the
mime_base64_encoded_text if statement to handle the cases of no
charset defined (thus, US-ASCII) and charset explicitly set to
US-ASCII or one of the aliases contained in the master IANA charset
list <URL:http://www.iana.org/assignments/character-sets>.
This bug was uncovered by a non-spam message sent from hanmail. The
Content-Type was set to "text/html; charset=euc-kr" and the hanmail
servers appropriately converted the message from 8bit to base64 before
transmission.
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