SITIC discovered a vulnerability in Apache 2's handling of environmental variable settings in the httpd configuration files (the main `httpd.conf' and `.htaccess' files). According to a SITIC advisory:
The buffer overflow occurs when expanding ${ENVVAR} constructs in .htaccess or httpd.conf files. The function ap_resolve_env() in server/util.c copies data from environment variables to the character array tmp with strcat(3), leading to a buffer overflow.
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