Content Manipulation with Double Certificate Attack
CVE-2021-25633

7.5HIGH

Key Information:

Vendor

The Document Foundation

Status
Libreoffice
Vendor
CVE Published:
11 October 2021

What is CVE-2021-25633?

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 combine multiple certificate data, which when opened caused LibreOffice to display a validly signed indicator but whose content was unrelated to the signature shown. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.

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Affected Version(s)

LibreOffice 7-0 < 7.0.6

LibreOffice 7-1 < 7.1.2

References

https://www.libreoffice.org/about-us/security/advisories/...
x_refsource_MISC
https://www.debian.org/security/2021/dsa-4988
vendor-advisoryx_refsource_DEBIAN

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

NDS of Ruhr University Bochum
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