Poodle – SSLv3 Vulnerability
October 15, 2014In the space of a month, yet another security vulnerability has been identified and announced.
Known as the ‘SSLv3 protocol vulnerability and POODLE Attack’, (aka “POODLEbleed”, referencing the the recent Heartbleed vulnerability), the SSL Man In The Middle (MITM) Information Disclosure Vulnerability (CVE-2014-3566) affects version 3.0 of SSL, which was introduced in 1996, and has since been superseded by several newer versions of its successor protocol, TLS. However, the vulnerability may still be exploited because SSL 3.0 continues to be supported by nearly every Web browser and a large number of Web servers.
When web browsers fail at connecting on a newer SSL version (i.e. TLS 1.0, 1.1, or 1.2), they may fall back to a SSL 3.0 connection. Because a network attacker can cause connection failures, including the failure of TLS 1.0/1.1/1.2 connections, they can force the use of SSL 3.0 and then exploit the poodle bug in order to decrypt secure content transmitted between a server and a browser.
All systems and applications utilizing the Secure Socket Layer (SSL) 3.0 with cipher-block chaining (CBC) mode ciphers may be vulnerable. However, the POODLE (Padding Oracle On Downgraded Legacy Encryption) attack demonstrates this vulnerability using web browsers and web servers, which is one of the most likely exploitation scenarios.
On 26 September 2014, the Shellshock vulnerability affecting many versions of Linux and Unix, was announced.
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Read more items related to security.
External References:
Online Poodle Bug Server Test
Poodlebleed.com
Red Hat Security Advisory on POODLE
Symantec
Trend Micro
US Computer Emergency Readiness Team, Alert TA14-290A
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