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IeApplication · Microsoft

CVE-2007-0942

HIGH · 9.3 CVSS v2.0 Published 2007-05-08
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Microsoft Internet Explorer 5.01 SP4 on Windows 2000 SP4; 6 SP1 on Windows 2000 SP4; 6 and 7 on Windows XP SP2, or Windows Server 2003 SP1 or SP2; and possibly 7 on Windows Vista does not properly "instantiate certain COM objects as ActiveX controls," which allows remote attackers to execute arbitrary code via a crafted COM object from chtskdic.dll.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Internet Explorer fails to properly validate and instantiate certain COM objects as ActiveX controls. When a user visits a malicious webpage, the browser can be tricked into loading a crafted COM object from chtskdic.dll, allowing the attacker to execute arbitrary code with the user's privileges.

MitigationApply the Microsoft security update MS07-027 (or subsequent cumulative updates that supersede it) to patch the vulnerable COM object instantiation behavior in Internet Explorer. Consider disabling the affected ActiveX control or upgrading to a newer browser version if patches are unavailable.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
IeApplication
Affected:= 6.0
Internet ExplorerApplication
Affected:= 5.0.1= 6.0= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
M
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:M/Au:N/C:C/I:C/A:C

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check your Internet Explorer version
    Open IE, click Help > About Internet Explorer, or run 'winver' command, or check registry key HKLM\Software\Microsoft\Internet Explorer\Version
    Affected if The version is 5.0.1, 6.0, or 7.0
  2. Verify if chtskdic.dll exists on the system
    Search for chtskdic.dll in system directories (C:\Windows\System32, C:\Windows\SysWOW64) using Windows Explorer search or command: dir /s C:\chtskdic.dll
    Affected if The file chtskdic.dll is present on the system and can be instantiated as an ActiveX control
  3. Confirm if the vulnerable COM object is registered
    Check Windows registry under HKCR\CLSID for entries referencing chtskdic.dll or Bib神雕ActiveX Control, or use 'reg query' commands to search for related COM CLSIDs
    Affected if A COM object referencing chtskdic.dll is registered in the Windows registry
  4. Check if ActiveX controls are enabled
    In IE, go to Tools > Internet Options > Security > Custom Level, look for 'Run ActiveX controls and plugins' setting; also check 'ActiveX controls and plugins' options in the same section
    Affected if ActiveX controls and plugins are set to Enabled or Prompt for the relevant security zone (Internet/Restricted Sites)
  5. Check if MS07-027 security update is installed
    Run 'reg query HKLM\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\Packages' looking for KB931768 (MS07-027), or use 'wmic qfe list' command, or check Windows Update history
    Affected if The MS07-027 security update (KB931768) is NOT installed

Your environment is affected if you are running Internet Explorer 5.0.1 through 7.0, the chtskdic.dll file is present and its COM object is registered, ActiveX controls are enabled, and the MS07-027 patch is missing.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the Microsoft security update MS07-027 (or subsequent cumulative updates that supersede it) to patch the vulnerable COM object instantiation behavior in Internet Explorer. Consider disabling the affected ActiveX control or upgrading to a newer browser version if patches are unavailable.

Recommended fix Moderate confidence

Microsoft Edge (Windows 10+) or Mozilla Firefox/Google Chrome (cross-platform)

  1. 1. Uninstall Internet Explorer 5.0.1, 6.0, or 7.0 from the affected Windows system
  2. 2. Upgrade to a supported browser: Microsoft Edge (for Windows 10/11) or Mozilla Firefox or Google Chrome for legacy systems
  3. 3. If Windows XP/Server 2003 must be used, apply Microsoft security update MS07-029 if available through Extended Support
  4. 4. Disable ActiveX controls in Internet Explorer settings as a workaround if upgrade is not immediately possible: Go to Tools > Internet Options > Security > Custom Level > Enable 'Initialize and script ActiveX controls not marked as safe' = Disable
Caveat Windows XP and Windows Server 2003 are end-of-life; upgrade to supported Windows version; legacy ActiveX-dependent applications may not work in modern browsers

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ie Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,480
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2007-0942 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data