Description
In the Bouncy Castle JCE Provider version 1.55 and earlier the DHIES/ECIES CBC mode vulnerable to padding oracle attack. For BC 1.55 and older, in an environment where timings can be easily observed, it is possible with enough observations to identify when the decryption is failing due to padding.
Remediation
References
https://github.com/bcgit/bc-java/commit/21dcb3d9744c83dcf2ff8fcee06dbca7bfa4ef35#diff-4439ce586bf9a13bfec05c0d113b8098
https://lists.debian.org/debian-lts-announce/2018/07/msg00009.html
https://usn.ubuntu.com/3727-1/
https://access.redhat.com/errata/RHSA-2018:2669
https://access.redhat.com/errata/RHSA-2018:2927
https://security.netapp.com/advisory/ntap-20181127-0004/
https://www.oracle.com/security-alerts/cpuoct2020.html
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