In situations where an attacker receives automated notification of the success or failure of a decryption attempt an attacker, after sending a very large number of messages to be decrypted, can recover a CMS/PKCS7 transported encryption key or decrypt any RSA encrypted message that was encrypted with the public RSA key, using a Bleichenbacher padding oracle attack. Applications are not affected if they use a certificate together with the private RSA key to the CMS_decrypt or PKCS7_decrypt functions to select the correct recipient info to decrypt. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
https://www.tenable.com/security/tns-2019-09
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.oracle.com/security-alerts/cpujan2020.html
https://www.oracle.com/security-alerts/cpuapr2020.html
https://www.openssl.org/news/secadv/20190910.txt
https://www.debian.org/security/2019/dsa-4540
https://www.debian.org/security/2019/dsa-4539
https://usn.ubuntu.com/4504-1/
https://usn.ubuntu.com/4376-2/
https://usn.ubuntu.com/4376-1/
https://support.f5.com/csp/article/K97324400?utm_source=f5support&%3Butm_medium=RSS
https://security.netapp.com/advisory/ntap-20190919-0002/
https://security.gentoo.org/glsa/201911-04
https://seclists.org/bugtraq/2019/Sep/25
https://seclists.org/bugtraq/2019/Oct/1
https://seclists.org/bugtraq/2019/Oct/0
https://lists.debian.org/debian-lts-announce/2019/09/msg00026.html
https://kc.mcafee.com/corporate/index?page=content&id=SB10365
http://packetstormsecurity.com/files/154467/Slackware-Security-Advisory-openssl-Updates.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00072.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00054.html