CyberSecBulletin
CVE-2024-7788NVD status: Modified

LibreOffice: Improper Verification of Cryptographic Signature

Published Updated By the CyberSecBulletin desk

CVE-2024-7788 is a high-severity improper verification of cryptographic signature vulnerability in LibreOffice from The Document Foundation, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version < 24.2.5 as the first without the flaw, so updating LibreOffice to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update LibreOffice to < 24.2.5 or a later version.
  2. Update libreoffice to 24.2.5 or a later version.
  3. Read the advisory on libreoffice.org for workarounds and exact fixed builds.
  4. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
The Document FoundationLibreOffice24.2 up to, but not including, < 24.2.5< 24.2.5
Thedocumentfoundationlibreoffice24.2 up to, but not including, 24.2.524.2.5

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.8HighCNA (documentfoundation.org)
CVSS 3.17.8HighNVD

Official description

Improper Digital Signature Invalidation vulnerability in Zip Repair Mode of The Document Foundation LibreOffice allows Signature forgery vulnerability in LibreOfficeThis issue affects LibreOffice: from 24.2 before < 24.2.5.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in LibreOffice

All LibreOffice vulnerabilities

Recent Improper Verification of Cryptographic Signature vulnerabilities

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