OpenSSL Divide-and-conquer session key recovery in SSLv2 (CVE-2016-0703)
Description
The get_client_master_key function in s2_srvr.c in the SSLv2 implementation in OpenSSL before 0.9.8zf, 1.0.0 before 1.0.0r, 1.0.1 before 1.0.1m, and 1.0.2 before 1.0.2a accepts a nonzero CLIENT-MASTER-KEY CLEAR-KEY-LENGTH value for an arbitrary cipher, which allows man-in-the-middle attackers to determine the MASTER-KEY value and decrypt TLS ciphertext data by leveraging a Bleichenbacher RSA padding oracle, a related issue to CVE-2016-0800.
Solution(s)
- http-openssl-0_9_8-upgrade-0_9_8_z_f
- http-openssl-1_0_0-upgrade-1_0_0_r
- http-openssl-1_0_1-upgrade-1_0_1_m
- http-openssl-1_0_2-upgrade-1_0_2_a
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