Today, Firefox uses SSLv3 for only about 0.3% of HTTPS connections. This relies on a behavior of browsers called insecure fallback, where browsers attempt to negotiate lower versions of TLS or SSL when connections fail. In particular, these servers are subject to a downgrade attack, in which the attacker tricks the browser into connecting with SSLv3. By exploiting this vulnerability, an attacker can gain access to things like passwords and cookies, enabling him to access a user’s private account data on a website.Īny website that supports SSLv3 is vulnerable to POODLE, even if it also supports more recent versions of TLS. This vulnerability, known as “POODLE”, is similar to the BEAST attack. In late September, a team at Google discovered a serious vulnerability in SSL 3.0 that can be exploited to steal certain confidential information, such as cookies. SSLv3 is an old version of the security system that underlies secure Web transactions and is known as the “Secure Sockets Layer” (SSL) or “Transport Layer Security” (TLS). This plan was developed with other browser vendors after a team at Google discovered a critical flaw in SSLv3, which can allow an attacker to extract secret information from inside of an encrypted transaction. We have a plan to turn off SSLv3 in Firefox. Browsers and websites need to turn off SSLv3 and use more modern security protocols as soon as possible, in order to avoid compromising users’ private information. Only Intel processors are vulnerable to Meltdown, ie not AMD.SSL version 3.0 is no longer secure. Seems, Windows, MacOS and Linux have been patched. To fully mitigate against Meltdown(CVE-2017-5754), only the OS kernel needs to be patched, ie the KPTI patch. For Windows and MacOS, it is through BIOS firmware updates, indirectly from the OEMs like Dell and Lenovo. For Linux, it is directly through Intel microcode updates. Patches for older processors will follow in the coming weeks. … Intel have only just released patches for processors that are not more than 5 years old. Seems, some Linux distros, eg Ubuntu, have not been patched. Red Hat Ent and Suse Ent have been patched. AMD claimed that their processors are nearly not susceptible to Spectre2. To fully mitigate against Spectre2(CVE-2017-5715), both the OS kernel and CPU need to be patched. Nearly all processors are susceptible to Spectre1. Now You: Is your browser vulnerable? (via Born)ĪFAIK, to fully mitigate against Spectre1(= CVE-2017-5753), both the browser and OS need to be patched. A good defense against potential attacks is the disabling of JavaScript or scripts in general. While there is still a bit of uncertainty left after your browser tested as not vulnerable in the test, it is still reassuring that known attacks can't exploit the vulnerability. A restart of the browser was required after the change before it would take affect. It did so while users were testing Opera and that explains why some users found that Opera was not vulnerable while others found that it was vulnerable. The company disabled Shared Array Buffer in Opera to mitigate Spectre. Strict Site Isolation mitigates Meltdown but not Spectre. Update: Opera contacted me with the following corrections. The team promises to improve the tool in the future. It is protected against a known attack, but it is possible that unknown attack methods may exist that can exploit the issue still. A status of not vulnerable, however, does not necessarily mean that the browser is adequately protected. Tencent's security team notes that a result of vulnerable means that Spectre-based attacks will work in the browser. *not vulnerable if you enable strict site isolation in the web browser. Here is a quick list of tested browsers and their vulnerability status (always assume the latest version): Some checks complete almost right away while others take longer to complete and involve cache processing. You find a "click to check" button at the top that you need to activate to run the test. This uncertainty is a thing of the past however as Tencent's XUANWU Lab released an online tester that checks whether web browsers are vulnerable to Spectre. While you can check whether your Windows operating system is vulnerable, you could not check whether your web browser is patched or vulnerable up until now. To mitigate known attack forms, users or admins have to enable strict site isolation in the web browser to do so. There are ways to mitigate the issue in Chrome and other Chromium-based browsers such as Opera or Vivaldi. Mozilla and Microsoft did for instance whereas Google and the whole Chromium-based group of browsers are not patched yet. Some browser makers pushed out patches fast.
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