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suseSuseOPENSUSE-SU-2017:3345-1
HistoryDec 16, 2017 - 3:07 p.m.

Security update for openssl (important)

2017-12-1615:07:17
lists.opensuse.org
79

0.956 High

EPSS

Percentile

99.2%

This update for openssl fixes the following issues:

  • OpenSSL Security Advisory [07 Dec 2017]
    • CVE-2017-3737: OpenSSL 1.0.2 (starting from version 1.0.2b) introduced
      an "error state" mechanism. The intent was that if a fatal error
      occurred during a handshake then OpenSSL would move into the error
      state and would immediately fail if you attempted to continue the
      handshake. This works as designed for the explicit handshake functions
      (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a
      bug it does not work correctly if SSL_read() or SSL_write() is called
      directly. In that scenario, if the handshake fails then a fatal error
      will be returned in the initial function call. If
      SSL_read()/SSL_write() is subsequently called by the application for
      the same SSL object then it will succeed and the data is passed
      without being decrypted/encrypted directly from the SSL/TLS record
      layer. In order to exploit this issue an application bug would have to
      be present that resulted in a call to SSL_read()/SSL_write() being
      issued after having already received a fatal error. OpenSSL version
      1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is
      not affected. (bsc#1071905)
    • CVE-2017-3738: There is an overflow bug in the AVX2 Montgomery
      multiplication procedure used in exponentiation with 1024-bit moduli.
      No EC algorithms are affected. Analysis suggests that attacks against
      RSA and DSA as a result of this defect would be very difficult to
      perform and are not believed likely. Attacks against DH1024 are
      considered just feasible, because most of the work necessary to deduce
      information about a private key may be performed offline. The amount
      of resources required for such an attack would be significant.
      However, for an attack on TLS to be meaningful, the server would have
      to share the DH1024 private key among multiple clients, which is no
      longer an option since CVE-2016-0701. This only affects processors
      that support the AVX2 but not ADX extensions like Intel Haswell (4th
      generation). Note: The impact from this issue is similar to
      CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. (bsc#1071906)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

0.956 High

EPSS

Percentile

99.2%

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