Microsoft Local Security Authority Subsystem Service (LSASS): Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.0071
         Microsoft Security Bulletin MS17-004: Security Update for
           Local Security Authority Subsystem Service (3216771)
                              10 January 2017

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

Product:           Microsoft Local Security Authority Subsystem Service (LSASS)
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-0004  

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS17-004

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Microsoft Security Bulletin MS17-004: Security Update for Local Security
Authority Subsystem Service (3216771)

Severity: Important

Executive Summary

A denial of service vulnerability exists in the way the Local Security
Authority Subsystem Service (LSASS) handles authentication requests.
An attacker who successfully exploited the vulnerability could cause a
denial of service on the target system's LSASS service, which triggers an
automatic reboot of the system.
This security update is rated Important for Microsoft Windows Vista,
Windows Server 2008, Windows 7, and Windows Server 2008 R2 (and Server Core).

Affected Software

Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2

Vulnerability Information

Local Security Authority Subsystem Service Denial of Service Vulnerability
- - CVE-2017-0004

A denial of service vulnerability exists in the way the Local Security
Authority Subsystem Service (LSASS) handles authentication requests.
An attacker who successfully exploited the vulnerability could cause a
denial of service on the target system's LSASS service, which triggers an
automatic reboot of the system.
To exploit the vulnerability an unauthenticated attacker could send a
specially crafted authentication request.
The security update addresses the vulnerability by changing the way that
LSASS handles specially crafted authentication requests.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title				CVE number	Publicly disclosed	Exploited
Local Security Authority Subsystem Service 	CVE-2017-0004	Yes			No
Denial of Service Vulnerability

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