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Category:   Application (Generic)  >   IBM iNotes and Domino Vendors:   IBM
IBM Lotus Domino Server Controller Authentication Flaw Lets Remote Users Bypass Authentication and Execute Arbitrary Code
SecurityTracker Alert ID:  1025241
SecurityTracker URL:
CVE Reference:   CVE-2011-1519   (Links to External Site)
Updated:  Mar 29 2011
Original Entry Date:  Mar 23 2011
Impact:   Execution of arbitrary code via network, Root access via network

Description:   A vulnerability was reported in IBM Lotus Domino Server Controller. A remote user can execute arbitrary code on the target system.

A remote user can exploit a flaw in the remote console to bypass authentication and execute arbitrary code on the target system. During the authentication process, the user can supply a specially crafted COOKIEFILE path value to the remote console via TCP port 2050 to cause the server to retrieve specially crafted credentials from a user-controlled location and compare the credentials in the user's authentication request against the user-controlled credentials, granting access to the system.

The vendor was notified on September 23, 2010.

The original advisory is available at:

Patrik Karlsson reported this vulnerability via TippingPoint's Zero Day Initiative.

Impact:   A remote user can execute arbitrary code on the target system with System privileges.
Solution:   No solution was available at the time of this entry.

The report indicates that a workaround includes restricting access to TCP port 2050 and setting a console password to provide another level of authentication and limit the commands available via the console.

Vendor URL: (Links to External Site)
Cause:   Authentication error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  [Full-disclosure] ZDI-11-110: (0day) IBM Lotus Domino Server Controller Authentication Bypass Remote Code Execution Vulnerability

ZDI-11-110: (0day) IBM Lotus Domino Server Controller Authentication Bypass Remote Code Execution Vulnerability

March 22, 2011

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:

-- Affected Products:
IBM Lotus Domino

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Lotus Domino Server Controller.
Authentication is not required to exploit this vulnerability. 

The flaw exists within the remote console functionality which listens by
default on TCP port 2050. When handling A user authentication the server
uses a user supplied COOKIEFILE path to retrieve stored credentials. The
application then compares this data against the user provided username
and cookie. The path to the COOKIEFILE can be a UNC path allowing the
attacker to control both the known good credentials and the challenge
credentials. A remote attacker can exploit this vulnerability to execute
arbitrary code under the context of the SYSTEM user.

-- Vendor Response:
March 22, 2011 - This vulnerability is being disclosed publicly without
a patch in accordance with the ZDI 180 day deadline.

-- Mitigations:
Setting a console password provides another level of authentication and
limits the commands available in the console.
To further mitigate this vulnerability access to 2050/tcp on hosts
running the Domino Server Controller application should be restricted to
authorized hosts.

-- Disclosure Timeline:
2010-09-23 - Vulnerability reported to vendor
2011-03-22 - Public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Patrik Karlsson <>

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents 
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

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specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
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