Microsoft Internet Explorer COM Object Instantiation Variant Vulnerability



Date Discovered

October 11, 2005


Microsoft Internet Explorer is prone to a buffer overflow vulnerability that is related to instantiation of COM objects. Successful exploitation could let remote attackers execute arbitrary code in the context of the currently logged in user on the affected computer. This is a variant of the vulnerability described in BID 14511 Microsoft Internet Explorer COM Object Instantiation Buffer Overflow Vulnerability. The difference between this issue and BID 14511 is that a different set of COM objects are affected that were not addressed in the previous BID.

Technologies Affected

  • Avaya DefinityOne Media Servers
  • Avaya DefinityOne Media Servers R10
  • Avaya DefinityOne Media Servers R11
  • Avaya DefinityOne Media Servers R12
  • Avaya DefinityOne Media Servers R6
  • Avaya DefinityOne Media Servers R7
  • Avaya DefinityOne Media Servers R8
  • Avaya DefinityOne Media Servers R9
  • Avaya IP600 Media Servers
  • Avaya IP600 Media Servers R10
  • Avaya IP600 Media Servers R11
  • Avaya IP600 Media Servers R12
  • Avaya IP600 Media Servers R6
  • Avaya IP600 Media Servers R7
  • Avaya IP600 Media Servers R8
  • Avaya IP600 Media Servers R9
  • Avaya S3400 Message Application Server
  • Avaya S8100 Media Servers
  • Avaya S8100 Media Servers R10
  • Avaya S8100 Media Servers R11
  • Avaya S8100 Media Servers R12
  • Avaya S8100 Media Servers R6
  • Avaya S8100 Media Servers R7
  • Avaya S8100 Media Servers R8
  • Avaya S8100 Media Servers R9
  • Avaya Unified Communication Center
  • Microsoft Internet Explorer 5.0
  • Microsoft Internet Explorer 5.0.1
  • Microsoft Internet Explorer 5.0.1 SP1
  • Microsoft Internet Explorer 5.0.1 SP2
  • Microsoft Internet Explorer 5.0.1 SP3
  • Microsoft Internet Explorer 5.0.1 SP4
  • Microsoft Internet Explorer 5.5
  • Microsoft Internet Explorer 5.5 SP1
  • Microsoft Internet Explorer 5.5 SP2
  • Microsoft Internet Explorer 6.0
  • Microsoft Internet Explorer 6.0 SP1
  • Microsoft Internet Explorer 6.0 SP2 do not use
  • Nortel Networks CallPilot 3.0.0
  • Nortel Networks CallPilot 4.0.0
  • Nortel Networks Centrex IP Client Manager 2.5.0
  • Nortel Networks Centrex IP Client Manager 7.0.0
  • Nortel Networks Centrex IP Client Manager 8.0.0
  • Nortel Networks Centrex IP Client Manager
  • Nortel Networks Centrex IP Element Manager 2.5.0
  • Nortel Networks Centrex IP Element Manager 7.0.0
  • Nortel Networks Centrex IP Element Manager 8.0.0


Run all software as a nonprivileged user with minimal access rights.
All non-administrative tasks should be performed as an unprivileged user with minimal access rights. This includes browsing the Web and reading email.

Do not follow links provided by unknown or untrusted sources.
Do not visit Web sites of questionable integrity, especially if solicited to do so by an untrusted or unfamiliar source.

Set web browser security to disable the execution of script code or active content.
Disabling scripting and active content in the Internet Zone may limit exposure to this and other vulnerabilities.

Implement multiple redundant layers of security.
Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments may complicate exploitation of memory corruption vulnerabilities.

Microsoft has released fixes to address supported version of the software. Fixes for Internet Explorer on Windows 98/98SE/ME may be obtained through Windows Update. Avaya has released advisory ASA-2005-214 to state which Avaya products are affected by The October 2005 release of Microsoft Windows security updates. Please see the referenced advisory for further information. Nortel Networks has released a technical support bulletin (2005006318) regarding this and other issues for their Centrex IP Client Manager (CICM). They report the vulnerabilities will be fixed in the upcoming 2.5, 7.0 and 8.0 maintenance releases. Please see the referenced bulletin for further information. Nortel Networks has released a technical support bulletin (2005006317) regarding this issue for CallPilot. Users are advised to contact Nortel for further information.



Discovery is credited to Will Dormann of CERT/CC, French Security Incident Response Team (FrSIRT), Parvez Anwar of MCI, and eEye Digital Security.

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