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Start learningUpgrade Debian:unstable
apache2
to version 2.4.64-1 or higher.
Note: Versions mentioned in the description apply only to the upstream apache2
package and not the apache2
package as distributed by Debian
.
See How to fix?
for Debian:unstable
relevant fixed versions and status.
In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.63, an access control bypass by trusted clients is possible using TLS 1.3 session resumption.
Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to a different set of trusted client certificates (for example with a different SSLCACertificateFile/Path setting). In such a case, a client trusted to access one virtual host may be able to access another virtual host, if SSLStrictSNIVHostCheck is not enabled in either virtual host.