SSL SSL/TLS Weak RC4 Cipher Suite Connect Attempt -2 (CVE-2015-2808)

Rule ID

1139992

Severity

Medium

Description

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.

Impact

Denial of service

Recommendation

Update vendor's patch.

IPS Category

Exploits

IPS Anomaly Group

N/A

IPS Rule Default Action

Allow

Reference

Keyword

N/A