Yet Another Padding Oracle in OpenSSL CBC Ciphersuites
May 4, 2016Filippo Valsorda
Summary
This post details a specific padding oracle vulnerability (CVE-2016-2107) found in OpenSSL's CBC mode cipher suites, which was a fix for a previous vulnerability (Lucky13). It explains the technical details of the vulnerability, how it exploits constant-time programming practices, and how Cloudflare engineers analyze and address such cryptographic weaknesses to maintain the security of its network and customer connections.
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