CVE-2021-25634: Timestamp Manipulation with Signature Wrapping
First published: Tue Oct 12 2021(Updated: )
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 modify a digitally signed ODF document to insert an additional signing time timestamp which LibreOffice would incorrectly present as a valid signature signed at the bogus signing time. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.
Credit: security@documentfoundation.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/libreoffice | <=1:6.1.5-3+deb10u7<=1:6.1.5-3+deb10u10 | 1:7.0.4-4+deb11u7 4:7.4.7-1 4:7.5.6-1 4:7.5.8~rc1-1 |
| The Document Foundation LibreOffice | >=7.0.0<7.0.6 | |
| The Document Foundation LibreOffice | >=7.1.0<7.1.2 | |
| Debian GNU/Linux | =11.0 |
Remedy
Update to 7.0.6 or 7.1.2 or 7.2.0
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Reference Links
- https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25634
- https://www.openwall.com/lists/oss-security/2021/10/11/2
- https://github.com/LibreOffice/core/commit/ad5930e87e788780a255523f106deb1dde5d7b37
- https://github.com/LibreOffice/core/commit/d92235df75829a8cf2ee8cc7b0b76063093b6cc2
- https://github.com/LibreOffice/core/commit/abe77c4fcb9ea97d9fff07eaea6d8863bcba5b02
- https://github.com/LibreOffice/core/commit/94ce59dd02fcfcaa1eb4f195b45a9a2edbd58242
- https://github.com/LibreOffice/core/commit/89befefb98487a27bff1003084e1200320828b3f
- https://github.com/LibreOffice/core/commit/b776cf1281660cf495e12824872576bb8e99d569
- https://security-tracker.debian.org/tracker/CVE-2021-25634
- https://www.debian.org/security/2021/dsa-4988
Frequently Asked Questions
What is the severity of CVE-2021-25634?
The severity of CVE-2021-25634 is high with a score of 7.5.
How does LibreOffice support digital signatures?
LibreOffice supports digital signatures of ODF documents and macros within documents.
What is the vulnerability in LibreOffice?
The vulnerability in LibreOffice is an Improper Certificate Validation vulnerability.
How can an attacker exploit CVE-2021-25634?
An attacker can exploit CVE-2021-25634 by modifying digitally signed ODF documents and macros within documents.
What is the remedy for CVE-2021-25634?
The remedy for CVE-2021-25634 is to update to the specified versions of LibreOffice provided by Debian.
- collector/security-tracker-debian
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- version/the document foundation libreoffice/7.1.0
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