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AUSCERT External Security Bulletin Redistribution
ESB-2011.0824
Vulnerability in .NET Framework Could Allow Information Disclosure
10 August 2011
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 4
Publisher: Microsoft
Operating System: Windows
Impact/Access: Access Confidential Data -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2011-1978
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS11-069.mspx
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Microsoft Security Bulletin MS11-069 - Moderate
Vulnerability in .NET Framework Could Allow Information Disclosure (2567951)
Published: August 09, 2011
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in
Microsoft .NET Framework. The vulnerability could allow information
disclosure if a user views a specially crafted Web page using a Web
browser that can run XAML Browser Applications (XBAPs). In a Web-based
attack scenario, an attacker could host a Web site that contains a Web
page that is used to exploit this vulnerability. In addition,
compromised Web sites and Web sites that accept or host user-provided
content or advertisements could contain specially crafted content that
could exploit this vulnerability. In all cases, however, an attacker
would have no way to force users to visit these Web sites. Instead, an
attacker would have to convince users to visit the Web site, typically
by getting them to click a link in an e-mail message or Instant
Messenger message that takes users to the attacker's Web site. This
vulnerability could also be used by Windows .NET applications to bypass
Code Access Security (CAS) restrictions.
This security update is rated Moderate for Microsoft .NET Framework 2.0
Service Pack 2, Microsoft .NET Framework 3.5.1, and Microsoft .NET
Framework 4 on all supported editions of Microsoft Windows. For more
information, see the subsection, Affected and Non-Affected Software, in
this section.
Affected Software
Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 4
Vulnerability Information
Socket Restriction Bypass Vulnerability - CVE-2011-1978
An information disclosure vulnerability exists in the way that .NET
Framework improperly validates the trust level within the
System.Net.Sockets namespace. An attacker who successfully exploited
this vulnerability would be able to access information not intended to
be exposed. Additionally, this vulnerability could be used by an
attacker to direct network traffic from a victim's system to other
network resources the victim can access. This could allow an attacker
to perform a denial of service to any system the victim's system can
access or use the victim's system to perform scanning of network
resources available to the victim. Note that this vulnerability would
not allow an attacker to execute code or to elevate their user rights
directly, but it could be used to produce information that could be
used to try to further compromise the affected system.
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