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Home arrow SecurityAlert Database

Arrow  Topic :

Mono XSP ASP.NET Server sourcecode disclosure vulnerability


Arrow  SecurityAlert : 2082
Arrow  CVE : CVE-2006-6104
Arrow  SecurityRisk : Medium  Security Risk Medium  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : Yes
Arrow  Exploit Available : Yes
Arrow  Credit : José Ramón Palanco
Arrow  Published : 29.12.2006

Arrow  Affected Software : Mono XSP ASP.NET Server 1.1 and 2.0



Arrow  Advisory Content :  

Mono XSP ASP.NET Server sourcecode disclosure vulnerability

Version: Tested on mono 1.2.1
XSP for ASP.NET 1.1 and 2.0 (This is a regression as this issue didn't
exists in Mono 1.0)

Discovered by: José Ramón Palanco: jose.palanco(at)eazel(dot)es

http://www.eazel.es

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

Description:

Attackers 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 informatin like credentials.

Original advisory:

http://www.eazel.es/advisory007-mono-xsp-source-disclosure-vulnerability
.html




Arrow  Feedback :

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