The _gnutls_server_name_recv_params function in lib/ext_server_name.c
in libgnutls in gnutls-serv in GnuTLS before 2.2.4 does not properly
calculate the number of Server Names in a TLS 1.0 Client Hello message
during extension handling, which allows remote attackers to cause a
denial of service (crash) or possibly execute arbitrary code via a
zero value for the length of Server Names, which leads to a buffer
overflow in session resumption data in the pack_security_parameters
function, aka GNUTLS-SA-2008-1-1.
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