Some vulnerabilities have been reported in Courier, which potentially can be exploited to cause a DoS (Denial of Service) or compromise a vulnerable system.
The vulnerabilities are reportedly caused due to boundary errors within the Shift-JIS ("shiftjis.c") and ISO2022JP ("iso2022jp.c") Japanese codeset converters when handling non-BMP (Basic Multilingual Plane) Unicode characters.
According to the developers, the Shift-JIS and ISO2022JP codeset mappings may be used by the IMAP and Webmail service but are not enabled by default.
Solution: The vulnerabilities have been fixed in the following versions:
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Subject: Courier Japanese Codeset Conversion Buffer Overflow Vulnerabilities
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