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Seeing security certificate errors when visiting certain websites? Learn how to remedy this issue in Internet Explorer.
The bar mitzvah attack is an attack on the SSL/TLS protocols that exploits the use of the RC4 cipher with weak keys for that cipher. [1] [2] While this affects only the first hundred or so bytes of only the very small fraction of connections that happen to use weak keys, it allows significant compromise of user security, for example by allowing the interception of password information [2 ...
The SSL certificate allowed the application to decrypt outgoing traffic to analyse it. [19] Once the new SSL certificate was installed, the application alerted Equifax's employees to suspicious network activity. The certificate had been expired for nine months. [20] By July 30, Equifax shut off the exploit. [14]
An attack called POODLE [19] (late 2014) combines both a downgrade attack (to SSL 3.0) with a padding oracle attack on the older, insecure protocol to enable compromise of the transmitted data. In May 2016 it has been revealed in CVE - 2016-2107 that the fix against Lucky Thirteen in OpenSSL introduced another timing-based padding oracle.
CRL for a revoked cert of Verisign CA. There are two different states of revocation defined in RFC 5280: Revoked A certificate is irreversibly revoked if, for example, it is discovered that the certificate authority (CA) had improperly issued a certificate, or if a private-key is thought to have been compromised.
It resulted from improper input validation (due to a missing bounds check) in the implementation of the TLS heartbeat extension. [5] Thus, the bug's name derived from heartbeat. [6] The vulnerability was classified as a buffer over-read, [7] a situation where more data can be read than should be allowed. [8]
A server implements an HSTS policy by supplying a header over an HTTPS connection (HSTS headers over HTTP are ignored). [1] For example, a server could send a header such that future requests to the domain for the next year (max-age is specified in seconds; 31,536,000 is equal to one non-leap year) use only HTTPS: Strict-Transport-Security: max-age=31536000.
The MustStaple TLS extension in a certificate can require that the certificate be verified by a stapled OCSP response, mitigating this problem. [10] OCSP also remains a valid defense against situations where the attacker is not a "man-in-the-middle" (code-signing or certificates issued in error).