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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0540
    Vulnerabilities in Lync Could Allow Remote Code Execution (2707956)
                               13 June 2012

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Lync
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Access Confidential Data        -- Remote with User Interaction
                   Cross-site Scripting            -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-1858 CVE-2012-1849 CVE-2012-0159
                   CVE-2011-3402  

Reference:         ESB-2012.0534
                   ESB-2012.0444
                   ESB-2011.1235.2
                   ESB-2011.1106

Original Bulletin: 
   http://technet.microsoft.com/en-us/security/bulletin/MS12-039

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Microsoft Security Bulletin MS12-039 - Important

Vulnerabilities in Lync Could Allow Remote Code Execution (2707956)

Published Date: June 12, 2012 | Updated Date: Unspecified

Version: 1.0

General Information

This security update resolves one publicly disclosed vulnerability
and three privately reported vulnerabilities in Microsoft Lync. The
most severe vulnerabilities could allow remote code execution if a
user views shared content that contains specially crafted TrueType
fonts.

This security update is rated Important for Microsoft Lync 2010,
Microsoft Lync 2010 Attendee, Microsoft Lync 2010 Attendant (32-bit),
and Microsoft Lync 2010 Attendant (64-bit).

The security update addresses the vulnerabilities by correcting how
specially crafted True Type Font files are handled, correcting the
manner in which Microsoft Lync loads external libraries, and modifying
the way that SafeHTML function sanitizes HTML content.

Affected Software

Microsoft Communicator 2007 R2
Microsoft Lync 2010 (32-bit)
Microsoft Lync 2010 (64-bit)
Microsoft Lync 2010 Attendee
Microsoft Lync 2010 Attendant (32-bit)
Microsoft Lync 2010 Attendant (64-bit)

Vulnerability Information

TrueType Font Parsing Vulnerability - CVE-2011-3402

A remote code execution vulnerability exists in the way that affected
components handle shared content that contains specially crafted
TrueType fonts. The vulnerability could allow remote code execution
if a user views shared content that contains specially crafted
TrueType fonts. An attacker who successfully exploited this
vulnerability could take complete control of an affected system.
An attacker could then install programs; view, change, or delete
data; or create new accounts with full user rights. Users whose
accounts are configured to have fewer user rights on the system
could be less impacted than users who operate with administrative
user rights.

To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see CVE-2011-3402.

TrueType Font Parsing Vulnerability - CVE-2012-0159

A remote code execution vulnerability exists in the way that affected
components handle shared content that contains specially crafted
TrueType fonts. The vulnerability could allow remote code execution
if a user views shared content that contains specially crafted
TrueType fonts. An attacker who successfully exploited this
vulnerability could take complete control of an affected system.
An attacker could then install programs; view, change, or delete
data; or create new accounts with full user rights. Users whose
accounts are configured to have fewer user rights on the system
could be less impacted than users who operate with administrative
user rights.

To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see CVE-2012-0159.

Lync Insecure Library Loading Vulnerability - CVE-2012-1849

A remote code execution vulnerability exists in the way that Microsoft
Lync handles the loading of DLL files. An attacker who successfully
exploited this vulnerability could take complete control of an
affected system. An attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
Users whose accounts are configured to have fewer user rights on
the system could be less impacted than users who operate with
administrative user rights.

To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see CVE-2012-1849.

HTML Sanitization Vulnerability - CVE-2012-1858

An information disclosure vulnerability exists in the way that HTML
is filtered that could allow an attacker to perform cross-site
scripting attacks and run script in the security context of the
current user.

To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see CVE-2012-1858.

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