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

Technote (troubleshooting)


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

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)



    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 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 >

    *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.

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

  • Document information

    More support for: IBM Domino

    Software version: 8.5, 8.5.1, 8.5.2

    Operating system(s): AIX, IBM i, Linux, Solaris, Windows, z/OS

    Reference #: 1575247

    Modified date: 21 December 2011

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