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Just to clarify this a bit further, the mod_dav module for Apache is not
vulnerable to the format string vulnerability (as outlined in the original
advisory from SCO, CAN-2002-0842)

mod_dav contains code that logs various errors and uses ap_log_rerror() to
do so. In mod_dav for Apache, ap_log_rerror is never called with strings
that can be influenced by a remote user.

Now Oracle added code to their version of mod_dav to log gateway errors,
but gateway errors contain strings that can be controlled by a remote
user. Therefore Oracle was vulnerable to a format string issue, but no
base release of Apache with mod_dav was vulnerable.

We did some research this morning after SCO released their advisory.
According to their ftp site SCO shipped OpenLinux with a standard copy of
mod_dav which was not vulnerable to this format string issue. Their
advisory, CSSA-2003-007.0 referenced new packages where they added a patch
which, unfortunately, added in code to log of gateway errors and contained
a format string vulnerability.

Thanks, Mark

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