Reference: CERT-EU Security Advisory 2014-253

Title: Microsoft Security Bulletin MS14-068 - Critical Vulnerability
in Kerberos Could Allow Elevation of Privileges (MS KB 3011780)

Version history:

18.11.2014 Initial publication.


Dear Colleagues,

Please find below details regarding a critical vulnerability in Kerberos
that could allow elevation of privileges in Microsoft Windows environment.


Details:

The vulnerability in Microsoft Windows Kerberos KDC could allow an
attacker to elevate unprivileged domain user account privileges to those
of the domain administrator account. An attacker could use these
elevated privileges to compromise any computer in the domain, including
domain controllers. An attacker must have valid domain credentials to
exploit this vulnerability. The affected component is available remotely
to users who have standard user accounts with domain credentials.

Microsoft is providing a security update to patch this vulnerability.
This security update is rated Critical for all supported editions of
Windows Server 2003, Windows Server 2008, Windows Server 2008 R2,
Windows Server 2012, and Windows Server 2012 R2. The update is also
being provided on a defense-in-depth basis for all supported editions of
Windows Vista, Windows 7, Windows 8, and Windows 8.1.

For more information about this update, see Microsoft Knowledge Base
Article 3011780 [2] and Microsoft Bulletin MS14-068 [1] and  CERT-EU
Security Advisory 2014-252 [7].

According to a Microsoft blog post [6], "The only way a domain
compromise can be remediated with a high level of certainty is a
complete rebuild of the domain.=E2=80=9D [5]


Recommendation:

Recommendation is to apply the provided update immediately [3],[4].


References:


[1] https://technet.microsoft.com/library/security/MS14-068
[2] https://support.microsoft.com/kb/3011780
[3]
http://blogs.technet.com/b/msrc/archive/2014/11/18/out-of-band-release-for-=
security-bulletin-ms14-068.aspx
[4]
http://krebsonsecurity.com/2014/11/microsoft-releases-emergency-security-up=
date/
[5]
http://www.eweek.com/security/microsoft-issues-emergency-patch-for-kerberos=
-bug.html
[6]
http://blogs.technet.com/b/srd/archive/2014/11/18/additional-information-ab=
out-cve-2014-6324.aspx
[7]  CERT-EU Security Advisory 2014-252


Best Regards,

CERT-EU Team (http://cert.europa.eu)
Phone: +32.2.2990005 / e-mail: cert-eu@ec.europa.eu
PGP KeyID 0x46AC4383
FP: 9011 6BE9 D642 DD93 8348 DAFA 27A4 06CA 46AC 4383
Privacy Statement:
http://cert.europa.eu/cert/plainedition/en/cert_privacy.html