libtasn1 -- stack-based buffer overflow in asn1_der_decoding

Debian reports:

Hanno Boeck discovered a stack-based buffer overflow in
the asn1_der_decoding function in Libtasn1, a library to
manage ASN.1 structures. A remote attacker could take advantage
of this flaw to cause an application using the Libtasn1 library
to crash, or potentially to execute arbitrary code.