Bulletproof TLS Newsletter #35
Return of Bleichenbacher's Oracle Threat (ROBOT)
12 December 2017
Author: Hanno Böck

This issue was distributed to 41,746 email subscribers.

Bulletproof TLS Newsletter is a free periodic newsletter bringing you commentary and news surrounding SSL/TLS and Internet PKI, designed to keep you informed about the latest developments in this space.

New-old attack against TLS: Return of Bleichenbacher's Oracle Threat (ROBOT)

In 1998 the cryptographer Daniel Bleichenbacher discovered a severe attack against the use of RSA in the PKCS #1 v1.5 padding mode in TLS. Over the years researchers have found many variations and improvements of this attack, most notably the DROWN attack against SSL version 2.

But the threat from Bleichenbacher's attack isn't over yet. The newly found ROBOT attack is the rebirth of this old attack. It affects implementations from several different vendors and only involves slight variations of Bleichenbacher's original attack. Among the affected sites were Facebook and PayPal.

The author of this newsletter was involved in the discovery of ROBOT.

More information can be found on the ROBOT web page.