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IETF официально вывел из обихода протокол SSLv3
Комитет IETF (Internet Engineering Task Force), занимающийся развитием протоколов и архитектуры интернета, выпустил RFC-7568, переводящий SSLv3 в разряд устаревших протоколов и предупреждающий, что его применение представляет угрозу безопасности систем. Опубликованный RFC требует прекратить применение SSLv3 и запрещает отправку клиентами и серверами пакетов ClientHello/ServerHello c полями…
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R.I.P, SSLv3! It was about time...
Secure Socket Layer (SSL) is an encrypted protocol to provide secure communication over the internet. The protocol has widespread use in various applications like web browsing, e-mail and Voice over IP. It was developed by Netscape and has seen 3 versions of it being released SSL 3.0 being the latest.
Poodle attack which is the acronym for “Padding Oracle On Downgraded Legacy Encryption", is a vulnerability that SSL 3.0 has and has made serious threats to the security of the protocol. A lot of websites support SSL 3.0 for secure communications and hence are prone to Poodle attacks. To be able to exploit the attack prone SSL 3.0, the attack initiator must be able to control the client server connection and insert the code into browser.
Any website that is supporting SSLv3 is open to POODLE attack. The servers are likely subjected to down inclination in which the attacker makes the browser to connect to SSLv3. Browsers which use only a miniscule fraction of SSL 3.0 for their secure connections are impacted as due to the sheer size of the web, this means millions of transactions per day. The scale of impact may be large due to traffic volumes, but the magnitude is not as severe as most websites already have higher versions of the protocol. Till date, Firefox uses SSLv3 connections approximately 0.3% but this small percentage in real account to millions of transactions per day as the size of web is very large.
As methods to mitigate the attack, browsers are releasing more secure versions and prompting their users to upgrade. Also the current versions of the browser are disabling SSL 3.0 on both the client and the server. Web services such as Cloud Flare are also dropping support of SSL 3.0 for Poodle attack prevention. Web operators are evaluating their traffic and disabling the SSL 3.0 protocol whilst the dependency on legacy clients is reducing. Mozilla earlier announced that SSLv3 will be disabled by default in Firefox 34, which got released on 25th Nov’2014. PayPal recently mailed their customers that they will no longer be able to accept payments as they are facing issues with SSLv3 and going through process to mitigate themselves from this attack, declaring 12th Jan’2015 as deadline for merchants.
Green Bird Media, a San Diego Web Design company, with A+ BBB ranking has been specializing in Drupal based secure website development and has complete cognition of this susceptibility and is advising the current customers on repercussions of this vulnerability so please contact us for any help.
Google Chrome 39 釋出，拔除對 SSLv3 的支援
Google Chrome 39 釋出，拔除對 SSLv3 的支援
看到 Google Chrome 39 釋出，拔除對 SSLv3 的支援：「Google Removes SSLv3 Fallback Support From Chrome」，官方的 post 反而沒有特別著墨這點：「Stable Channel Update」。
可以利用「POODLE Attack and SSLv3 Support Measurement」測試瀏覽器是否支援 SSLv3。
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POODLE needs to go for a walk...
POODLE a new vulnerability in the SSL protocol, identified by three Google security researchers (Thai Duong, Bodo Moller and Krzysztof Kotowiczis) is here and is raising the question if it is time for SSLv3 go to for a walk. By walk I mean just leave the SSL/TLS party, given its krinkles that are being shown in its shield. Without going into much discussion about the details of POODLE, it is a vulnerability in the way that the SSL protocol is performing its performing oracle padding for the block ciphers it is using. SSLv3 has been supported for almost 20 years, since 1996, and it may be time to disable its support on our servers. Please find below quick instructions for how to disable SSLv3 in Apache. To disable SSLv3 on your Apache server can configure it by modifying the Apache configuration to reflect as below: SSLProtocol All -SSLv2 -SSLv3 This provides support for all current TLS version of the protocol and explicitly denies the SSLv2 and SSLv3 protocols from being supported. Before restartig your server, run the config test to ensure that the changes made were correctly apachectl configtest sudo service apache2 restart
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Je vous invite à lire mon dernier blogue sur la vulnérabilité POODLE du protocole SSLv3.
How to disable SSLv3 in pound SSL proxies
Protect your pound SSL proxy by disabling sslv3 in your pound config:
Just add the line:
Ciphers "TLSv1:-LOW:-aNULL:-ADH:-EXP:-eNULL"
In /etc/pound.cgf between ListenHTTPS and END and after your Cert and Calist definitions. This will effectively disable sslv3 on SSL server proxies running pound. Save the file and restart pound.
Patch webservers on Plesk for the SSLv3 poodle bug
There is no patch for the poodle bug in SSLv3 yet, the only option for now is disabling SSLv3.
For the webserver this can be done with:
echo 'SSLProtocol all -SSLv2 -SSLv3' > /etc/httpd/conf.d/zz099-psa-disable-weak.conf
Then restart the webserver with service httpd restart.
More info on how to patch plesk itself and other services coming soon. Plesk, imap, smtp are also vulnerable. The pooble bug allows to intercept SSL encrypted traffic at client level due to a design issue with SSLv3.
