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Start learningUpgrade RHEL:7 openssl-devel to version 1:1.0.1e-51.el7_2.4 or higher.
This issue was patched in RHSA-2016:0301.
Note: Versions mentioned in the description apply only to the upstream openssl-devel package and not the openssl-devel package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
ssl/s2_srvr.c in OpenSSL 1.0.1 before 1.0.1r and 1.0.2 before 1.0.2f does not prevent use of disabled ciphers, which makes it easier for man-in-the-middle attackers to defeat cryptographic protection mechanisms by performing computations on SSLv2 traffic, related to the get_client_master_key and get_client_hello functions.