The System.Web class in the XSP for ASP.NET server 1.1 through 2.0 in Mono does not properly verify local pathnames, which allows remote attackers to (1) read source code by appending a space (%20) to a URI, and (2) read credentials via a request for Web.Config%20.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2092
http://www.vupen.com/english/advisories/2006/5099
http://www.ubuntu.com/usn/usn-397-1
http://www.securityfocus.com/archive/1/454962/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDKSA-2006:234
http://securitytracker.com/id?1017430
http://securityreason.com/securityalert/2082
http://security.gentoo.org/glsa/glsa-200701-12.xml
http://secunia.com/advisories/23779
http://secunia.com/advisories/23776
http://secunia.com/advisories/23727
http://secunia.com/advisories/23597
http://secunia.com/advisories/23462
http://secunia.com/advisories/23435
http://lists.suse.com/archive/suse-security-announce/2007-Jan/0002.html