CVE-2024-47252

A vulnerability was found in the Apache HTTP Server. Insufficient escaping of user-supplied data in mod_ssl 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 mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized data provided by the client may appear in log files.

The issue rated as a Moderate vulnerability rather than an Important one because its impact is confined to log integrity without affecting the core security properties of the Apache HTTP Server such as confidentiality, availability, or direct system integrity. The flaw only occurs in non-default logging configurations where administrators explicitly use CustomLog directives with %{varname}x or %{varname}c to log mod_ssl variables like SSL_TLS_SNI, which limits the exposure. While an attacker-controlled TLS client can inject escape or control characters into the logs, potentially leading to log injection or misleading log entries, this does not allow execution of arbitrary code or compromise of the server itself. Furthermore, successful exploitation requires the attacker to craft specific TLS-level parameters, and there are no direct security consequences unless the logs are processed by downstream systems that are themselves vulnerable.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.