Univention Corporate Server 4.1 erratum 256 (security)

This update addresses the following issue(s):
* The sec_asn1d_parse_leaf function improperly restricts access to an
  unspecified data structure (CVE-2015-7181)
* Heap-based buffer overflow in the ASN.1 decoder (CVE-2015-7182)
* The s_mp_div function in lib/freebl/mpi/mpi.c in improperly divides
  numbers, which might make it easier for remote attackers to defeat
  cryptographic protection mechanisms (CVE-2016-1938)
* Heap-based buffer overflow allows remote attackers to execute
  arbitrary code via crafted ASN.1 data in an X.509 certificate
  (CVE-2016-1950)
* Use-after-free vulnerability in the
  ssl3_HandleECDHServerKeyExchange function allows remote attackers
  to cause a denial of service or possibly have unspecified other
  impact by making an SSL (1) DHE or (2) ECDHE handshake at a time of
  high memory consumption (CVE-2016-1978)
* Use-after-free vulnerability in the
  PK11_ImportDERPrivateKeyInfoAndReturnKey function allows remote
  attackers to cause a denial of service or possibly have unspecified
  other impact via crafted key data with DER encoding (CVE-2016-1979)
* With TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is
  enabled on a server but not on a client, does not properly convey a
  DHE_EXPORT choice, which allows man-in-the-middle attackers to
  conduct cipher-downgrade attacks by rewriting a ClientHello with
  DHE replaced by DHE_EXPORT and then rewriting a ServerHello with
  DHE_EXPORT replaced by DHE, aka the "Logjam" issue.
  The solution in nss was to not accept bit lengths less than
  1024. This may potentially be a backwards incompatibility issue but
  such low bit lengths should not be in use so it was deemed
  acceptable. (CVE-2015-4000)
* Mozilla Network Security Services (NSS) before 3.23, as used in
  Mozilla Firefox before 47.0, allows remote attackers to cause a
  denial of service (memory corruption and application crash) or
  possibly have unspecified other impact via unknown
  vectors. (CVE-2016-2834)