AnsweredAssumed Answered

It is official: RC4 is broken. CVE-2015-2808

Question asked by j-mailor on Apr 13, 2015
Latest reply on Apr 28, 2015 by Ivan Ristić

See CVE-2015-2808: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2808 with info: The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic that occasionally relies on keys affected by the Invariance Weakness, and then using a brute-force approach involving LSB values, aka the "Bar Mitzvah" issue. And detailed document: https://www.blackhat.com/docs/asia-15/materials/asia-15-Mantin-Bar-Mitzvah-Attack-Breaking-SSL-With-13-Year-Old-RC4-Weakness-wp.pdf

 

SSL labs test should penalize RC4 cipher probably with F grade. What is your opinion?

Outcomes