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libtasn1 -- ASN.1 length decoding vulnerability

Description:

Mu Dynamics, Inc. reports:

Various functions using the ASN.1 length decoding logic in Libtasn1 were incorrectly assuming that the return value from asn1_get_length_der is always less than the length of the enclosing ASN.1 structure, which is only true for valid structures and not for intentionally corrupt or otherwise buggy structures.

References:

Affects:

portaudit: libtasn1 -- ASN.1 length decoding vulnerability

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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>