A vulnerability was discovered and corrected in mono:

Untrusted search path vulnerability in metadata/loader.c in Mono 2.8
and earlier allows local users to gain privileges via a Trojan horse
shared library in the current working directory (CVE-2010-4159).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct this issue.