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Mono XSP ASP.NET Server Source Code Disclosure Vulnerability
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SUMMARY
A vulnerability in Mono's XSP ASP.NET Server allows remote attacker to
cause the program to reveal the source code of the files being requested.
DETAILS
Vulnerable Systems:
* Mono version 1.2.1
* XSP for ASP.NET version 1.1 and version 2.0
Attackers can use source code disclosure attacks to try to obtain the
source code of server-side applications. The basic role of Web servers is
to serve files as requested by clients. Files can be static, such as image
and HTML files, or dynamic, such as ASPX, ASHX, ASCX, ASAX, webservices
like ASMX files and any language supported by Mono like: C#, boo, nemerle,
vb files: .cs, .boo, vb, .n, ... When the browser requests a dynamic file,
the Web server first executes the file and then returns the result to the
browser. Hence, dynamic files are actually code executed on the Web
server.
Using a source code disclosure attack, an attacker can retrieve the source
code of server-side file. Obtaining the source code of server-side files
grants the attacker deeper knowledge of the logic behind the Web
application, how the application handles requests and their parameters,
the structure of the database, vulnerabilities in the code and source code
comments. Having the source code, and possibly a duplicate application to
test on, helps the attacker to prepare an attack on the application.
An attacker can cause source code disclosure using adding %20 (space char)
after the URI, for example http://www.server.com/app/Default.aspx%20
Update: is also possible retrieve Web.Config file. This file contains
sensible information like credentials.
Workaround:
A temporary patch can be found at:
<http://www.eazel.es/advisory007-mono-xsp-source-disclosure-vulnerability.patch>
http://www.eazel.es/advisory007-mono-xsp-source-disclosure-vulnerability.patch
Time Line:
* Nov 29, 2006: Discovered security issue by Jose Ramon Palanco
* Nov 30, 2006: Reported to Mono Project
* Dec 1, 2006: Patch in subversion rev 68776
* Dec 5, 2006: Mono is testing the patch and building packages for the
fix
* Dec 19, 2006: Published advisory
ADDITIONAL INFORMATION
The information has been provided by <mailto:jose.palanco@eazel.es> Jose
Ramon Palanco.
The original article can be found at:
<http://www.eazel.es/advisory007-mono-xsp-source-disclosure-vulnerability.html>
http://www.eazel.es/advisory007-mono-xsp-source-disclosure-vulnerability.html
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