Incorrect trust validation of signature with ambiguous KeyInfo children
CVE-2021-25636

7.5HIGH

Key Information:

Vendor

The Document Foundation

Status
Libreoffice
Vendor
CVE Published:
24 February 2022

What is CVE-2021-25636?

LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to contain both "X509Data" and "KeyValue" children of the "KeyInfo" tag, which when opened caused LibreOffice to verify using the "KeyValue" but to report verification with the unrelated "X509Data" value. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.5.

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Affected Version(s)

LibreOffice 7.2 < 7.2.5

References

https://www.libreoffice.org/about-us/security/advisories/...
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg0...
mailing-list

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks to NDS of Ruhr University Bochum for discovering and reporting this problem.
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