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List:       secunia-sec-adv
Subject:    [SA22192] DokuWiki Denial of Service and Command Injection
From:       Secunia Security Advisories <sec-adv () secunia ! com>
Date:       2006-09-29 15:47:05
Message-ID: 20060929154705.18541.qmail () secunia ! com
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TITLE:
DokuWiki Denial of Service and Command Injection

SECUNIA ADVISORY ID:
SA22192

VERIFY ADVISORY:
http://secunia.com/advisories/22192/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
From remote

SOFTWARE:
DokuWiki
http://secunia.com/product/4910/

DESCRIPTION:
Some vulnerabilities have been reported in DokuWiki, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
potentially compromise a vulnerable system.

Input passed to the "w" and "h" parameters in lib/exec/fetch.php is
not properly sanitised before being passed as resize parameters to
the "convert" application. This can be exploited to cause a DoS due
to excessive CPU and memory consumption by passing very large
numbers, or to inject arbitrary shell commands by passing specially
crafted strings to the "w" and "h" parameter.

Successful exploitation requires that the "$conf[imconvert]" option
is set.

SOLUTION:
Update to version 2006-03-09e.
http://www.splitbrain.org/projects/dokuwiki

PROVIDED AND/OR DISCOVERED BY:
DoS vulnerability reported by Thomas Kindler.
Command injection reported by the vendor.

ORIGINAL ADVISORY:
http://bugs.splitbrain.org/?do=details&id=924
http://bugs.splitbrain.org/?do=details&id=926

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