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fetchmail -- heap overflow on verbose X.509 display

Description:

Matthias Andree reports:

In verbose mode, fetchmail prints X.509 certificate subject and issuer information to the user, and counts and allocates a malloc() buffer for that purpose.

If the material to be displayed contains characters with high bit set and the platform treats the "char" type as signed, this can cause a heap buffer overrun because non-printing characters are escaped as \xFF..FFnn, where nn is 80..FF in hex.

References:

Affects:

portaudit: fetchmail -- heap overflow on verbose X.509 display

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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.


Oliver Eikemeier <eik@FreeBSD.org>