Insufficient escaping of user-supplied data in modssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging configuration where CustomLog is used with "%{varname}x" or "%{varname}c" to log variables provided by modssl such as SSLTLSSNI, no escaping is performed by either modlogconfig or mod_ssl and unsanitized data provided by the client may appear in log files.
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