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Vulnerability of Microsoft SharePoint Server: reading ASPX files

Synthesis of the vulnerability 

An attacker can obtain the source code of some pages hosted on Microsoft Office SharePoint Server.
Vulnerable products: MOSS.
Severity of this weakness: 2/4.
Creation date: 27/10/2009.
Références of this bulletin: 976829, BID-36817, CVE-2009-3830, VIGILANCE-VUL-9126.

Description of the vulnerability 

The Microsoft Office SharePoint Server hosts pages with the ASPX extension.

Some ASPX pages can be located in a Document Library, which can be reached via:
  http://server/DocumentLibrary/page.aspx

The source code of ASPX pages should not be readable. However, an attacker can use the /_layouts/download.aspx url, in order to access to the source code of pages located in a Document Library.

An attacker can therefore obtain the source code of some pages hosted on Microsoft Office SharePoint Server.
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This security alert impacts software or systems such as MOSS.

Our Vigil@nce team determined that the severity of this security weakness is medium.

The trust level is of type confirmed by the editor, with an origin of internet client.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this security announce.

Solutions for this threat 

Microsoft SharePoint Server: workaround.
The Microsoft article indicates permissions which can view the source code of ASPX pages.
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