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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.1282
         Lotus Domino Denial of Service Vulnerability during Notes
                         authentication processing
                             23 December 2011

===========================================================================

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

Product:           Lotus Domino Server and Notes
Publisher:         IBM
Operating System:  AIX
                   Solaris
                   Linux variants
                   Windows
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-1393  

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21575247

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Security Advisory: Lotus Domino Denial of Service Vulnerability during Notes
authentication processing (CVE-2011-1393)

Technote (troubleshooting)

Problem

Security Advisory CVE ID: CVE-2011-1393

Fortiguard contacted IBM to report a denial of service attack when a malicious
packet is supplied to the Domino Server via Notes RPC. For more information,
see Fortiguard Advisory FG-VD-11-007 at http://www.fortiguard.com/.

If an attacker can monitor and record all communications between a Notes client
and a Domino server then it is possible to crash the Domino server by modifying
a specific packet, in a specific way, during a specific operation.

Note: the use case cited by Fortiguard is very rare and, as such, requires
careful coordination by the attacker.

Resolving the problem

Affected versions

The following releases of IBM Lotus Domino Server are susceptible to this
malicious attack:

    8.5.2 FP3 and earlier
    8.5.1
    8.5
    8.0.x

Recommended Fix

FG-VD-11-007 has been investigated by IBM and is tracked in SPR# KLYH8FTK5Y.
To address the issues, you are encouraged to apply the following IBM Lotus
Domino Server releases:

    8.5.3
    8.5.2 Fix Pack 4 (or later Fix Packs)

Workarounds

None

CVSS Score
IBM offers the following CVSS Score for FG-VD-11-007

Security Rating using Common Vulnerability Scoring System (CVSS) v2
CVSS Base Score: <7.8>
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/71805 for the
current score CVSS Environmental Score*: <Undefined >

Base Score Metrics:

    Related exploit range/Attack Vector: < Network >
    Access Complexity: < Low >
    Authentication < None >
    Confidentiality Impact: < None >
    Integrity Impact: < None>
    Availability Impact: < Complete >

Temporal Score Metrics:

    Exploitability: < Proof of Concept>
    Remediation Level: < Official Fix >
    Report Confidence: < Confirmed >

References:

CVSS v2 Complete Documentation
  http://www.first.org/cvss/cvss-guide.html
CVSS v2 Online Calculator 
  http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2


*The CVSS Environment Score is customer environment-specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact
of this vulnerability in their environments by accessing the referenced links.

Note: According to the Forum of Incident Response and Security Teams (FIRST),
the Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.


Acknowledgement

This vulnerability was reported to IBM by Fortiguard Labs. See the following
link for more information.

http://www.fortiguard.com/

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