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DokuWiki Denial of Service and Command Injection
Secunia Advisory: SA22192
Release Date: 2006-09-29
Last Update: 2006-10-03
Popularity: 7,324 views

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Workaround

Software:DokuWiki

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CVE reference:CVE-2006-5098
CVE-2006-5099


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.

Changelog:
2006-10-03: Added CVE references.

Original Advisory:
http://bugs.splitbrain.org/?do=details&id=924
http://bugs.splitbrain.org/?do=details&id=926


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