POODLE Strikes (Bites?) Again, (Tue, Dec 9th)

As Adam Langley notes in hisblog [1], the POODLE vulnerability may be found in some implementations of TLS, not just in SSLv3.

The problem is an implementation issue, not so much a problem with the standard as in the original SSLv3 instance. The POODLE vulnerability was caused by SSLv3s use of unspecified, and unprotected use of padding. In TLS, the padding is specified, and TLS should no longer be vulnerable to the attack. However, it turns out that some implementations will not verify if the correct padding was used. An incorrect padding would go unnoticed (just like in SSLv3) and could lead to the POODLE problem.

On the other hand: We still havent seen widespread (any?) exploitation of the POODLE vulnerability. So focus on what Microsoft has to offer first today, then take a look if you still have some outstanding Poodles in your network. F5 load-balancers apparently suffer from the new problem.

In addition, Heise.de notes that KasperskysInternet Security product, which implements a proxy on the protected host, still supports SSLv3 and may cause connections to be downgraded to SSLv3, even if the users browser no longer supports SSLv3.

[1] https://www.imperialviolet.org


Johannes B. Ullrich, Ph.D.
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Reposted from SANS. View original.

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