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CVE Record

CVE-2018-10120: The SwCTBWrapper::Read function in sw/source/filter/ww8/ww8toolbar.cxx in LibreOffice before 5.4.6.1 and 6....

The SwCTBWrapper::Read function in sw/source/filter/ww8/ww8toolbar.cxx in LibreOffice before 5.4.6.1 and 6.x before 6.0.2.1 does not validate a customizations index, which allows remote attackers to cause a denial of service (heap-based buffer overflow with write access) or possibly have unspecified other impact via a crafted document that contains a certain Microsoft Word record.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A malicious document could crash vulnerable LibreOffice versions, and the underlying heap buffer overflow means impact beyond a crash was not ruled out by the CVE text. The known affected range is LibreOffice before 5.4.6.1 and 6.x before 6.0.2.1.

Executive priority

Treat as a timely patching issue, not an emergency based on current evidence. Prioritize systems that handle external documents, shared workstations, and any automated document conversion pipeline.

Technical view

The flaw is in SwCTBWrapper::Read in sw/source/filter/ww8/ww8toolbar.cxx. LibreOffice did not validate a customizations index while parsing a Microsoft Word record, enabling heap-based buffer overflow writes from a crafted document. Public sources identify fixed LibreOffice releases and Linux vendor updates.

Likely exposure

Exposure is most likely on desktops, VDI images, or document-processing systems running vulnerable LibreOffice builds and opening untrusted Word documents. Distribution packages may be affected if not updated through 2018 security advisories.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. The attack path is document-based: a remote attacker would need a crafted document to be opened or processed by vulnerable LibreOffice.

Researcher notes

Evidence supports a bounds-validation failure leading to heap buffer overflow write during WW8 toolbar customization parsing. Public details do not establish reliable code execution, active exploitation, or full affected distribution package matrices beyond cited vendor advisories.

Mitigation direction

  • Upgrade LibreOffice to 5.4.6.1, 6.0.2.1, or later.
  • Apply relevant Red Hat, Debian, or Ubuntu security updates.
  • Reduce automated processing of untrusted Word documents on vulnerable hosts.
  • Use vendor guidance for any distribution-specific package status.

Validation and detection

  • Inventory LibreOffice versions across workstations and document-processing servers.
  • Verify packages map to fixed vendor advisories or later releases.
  • Check whether automated workflows parse untrusted Word documents.
  • Confirm endpoint controls restrict untrusted document handling where upgrades are delayed.
Prepared
Confidence
high
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
9Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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