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What about the botnet security advisory at http://isc.sans.org/diary.php?storyid=1672?

Sites that are running with PHP's register_globals setting set to "On" and versions of PmWiki prior to 2.1.21 may be vulnerable to a botnet exploit that is taking advantage of a bug in PHP. The vulnerability can be closed by turning register_globals off, upgrading to PmWiki 2.1.21 or later, or upgrading to PHP versions 4.4.3 or 5.1.4. In addition, there is a test at PmWiki:SiteAnalyzer that can be used to determine if your site is vulnerable.

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Page last modified on September 06, 2006, at 09:55 AM

Warning: mkdir(wiki.d): Permission denied in /mnt/fmirror4/gmirror/ports/www/pmwiki/work/pmwiki-2.1.27/pmwiki.php on line 435

PmWiki can't process your request

PmWiki needs to have a writable wiki.d/ directory before it can continue. You can create the directory manually by executing the following commands on your server:

    mkdir /mnt/fmirror4/gmirror/ports/www/pmwiki/work/pmwiki-2.1.27/wiki.d
    chmod 777 /mnt/fmirror4/gmirror/ports/www/pmwiki/work/pmwiki-2.1.27/wiki.d
Then, reload this page.

Or, for a slightly more secure installation, try executing
    chmod 2777 /mnt/fmirror4/gmirror/ports/www/pmwiki/work/pmwiki-2.1.27
on your server and following this link. Afterwards you can restore the permissions to their current setting by executing
    chmod 755 /mnt/fmirror4/gmirror/ports/www/pmwiki/work/pmwiki-2.1.27
.

We are sorry for any inconvenience.