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Posted Aug 8, 2007
Authored by Michal Bucko | Site eleytt.com

Windows Calendar (Vista) ICS file handling suffers from a denial of service vulnerability. Toolbar suffers from multiple vulnerabilities. OpenOffice version 2.2 suffers from a denial of service vulnerability when handling multiple file extensions.

tags | advisory, denial of service, vulnerability
systems | windows
SHA-256 | 318b69fb4e51116ee75ae6cec03826b6139dfd2e43c7e64b83c30d6cd56082cd


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Eleytt Research

Michal Bucko, Eleytt, www.eleytt.com/michal.bucko
Shyaam Sundhar, Eleytt
Tomasz Galdys, Eleytt


Michal Bucko, Eleytt, www.eleytt.com/michal.bucko

Vulnerability Table

1. Windows Calendar (Vista) ICS File Denial of Service Vulnerability
2. Toolbar vulnerabilities:

a) Toolbar Gaming IE Toolbar Denial of Service Vulnerability

b) ExportNation IE Toolbar Denial of Service Vulnerability

c) Advanced Searchbar Denial of Service Vulnerability

Information Table

1. OpenOffice 2.2 Multiple File Extensions Handling Denial of Service Issue

Vulnerability Details

1. Windows Calendar (Vista) ICS File Denial of Service Vulnerability


Specially malformed ISC file, once imported to Windows Calendar,
leads to Windows Calendar to a crash (after the remainder is set).
Windows Calendar crashes every each time Vista is rebooted. The
vulnerability stems from NULL pointer dereference and has been
confirmed on fully updated Windows Vista. Successful at

MSRC has been informed and confirmed the situation. Both, Eleytt
and MSRC consider this issue of low impact.

2. Toolbar vulnerabilities


a) The vulnerability in 'CallCmd' function in toolbar_gaming.dll
has its roots in NULL pointer dereference, which results in
denial of service conditions.

b) The vulnerability lies in Toolbar.DLL library, in 'isChecked'

The registers' values are below:

EIP 01838C70
EAX 00000000

The crash itself happens here:

1838C70 MOV ECX,[EAX+188]

Stack dump is full of 'A', but SEH hasn't been overwritten. The problem
lies in NULL pointer dereference. The vulnerability, therefore, hasn't
been proven exploitable. Arbitrary code execution is probably impossible.

c) The vulnerability lies in Toolbar.DLL library, in 'isChecked'
function. The exactly the same kind of vulnerability that described
in b).

Information Table

1. OpenOffice 2.2 Multiple File Extensions Handling Denial of Service Issue


An issue in OpenOffice 2.2 Multiple File Extension Handling leads to denial
of service conditions. Due to the minimum severity of the issue, the
information is provided in Information Table. The issue does not allow code
execution. Eleytt provides exemplary PoC exploits for this issue for
reponsible security companies only.

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Eleytt - Company Information

Eleytt Corporation is specialized in penetration testing, vulnerability
development, advanced reverse engineering and exploitation techniques.
Eleytt provides various security-related services: risk assessment,
security policy, security assurance, incident management, web
application security testing, continuous security assurance programs.
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This document and all the information it contains are provided "as is",
for educational purposes only, without warranty of any kind, whether
express or implied.

The authors reserve the right not to be responsible for the topicality,
correctness, completeness or quality of the information provided in
this document. Liability claims regarding damage caused by the use of
any information provided, including any kind of information which is
incomplete or incorrect, will therefore be rejected.

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