CVE-2021-25636
Incorrect trust validation of signature with ambiguous KeyInfo children
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.
We have discovered 53 live websites that are affected by CVE-2021-25636.
Affected Software
| Product | |
| Category | Content Management System |
| Vulnerable Versions |
|
| Total Vulnerable Versions | 195 |
| Vulnerable Domains | 53 live websites (1.57% of LibreOffice install base) |
Details
- Published - Feb 22, 2022
- Updated - Mar 26, 2023
Credits
- Thanks to NDS of Ruhr University Bochum for discovering and reporting this problem.
CWE
CVE References
CWE References
Countries
 United States | 14 websites |
 Germany | 15 websites |
 France | 6 websites |
 China | 3 websites |
 Czech Republic | 2 websites |
 GB | 2 websites |
 Hungary | 2 websites |
 Netherlands | 2 websites |
 Canada | 1 websites |
TLDs
| .com | 13 websites |
| .de | 11 websites |
| .org | 5 websites |
| .fr | 5 websites |
| .cn | 2 websites |
| .cz | 2 websites |
| .net | 2 websites |
| .nl | 2 websites |
| .ca | 1 websites |
| .ch | 1 websites |
Vulnerable Versions
Vulnerable versions are highlighted in redReferences
- https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25636/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NE6UIBCPZWRBWPSEGJOPNWPPT3CCMVH2/
- https://lists.debian.org/debian-lts-announce/2023/03/msg00022.html
Websites affected by CVE-2021-25636
Top websites that are affected by CVE-2021-25636. Please click on the "Contact us" link to get more information.| Domain | Country | Rank | Contacts |
|---|---|---|---|
| ******.***.cn | China | *,***,*** | |
| ******.*********.de | Germany | *,***,*** | |
| ***.*******.com | United States | *,***,*** | |
| ***.***.cn | China | *,***,*** | |
| ****.org | United States | *,***,*** | |
| ****************.de | Germany | *,***,*** | |
| ****.net | United States | *,***,*** | |
| **********.de | Germany | *,***,*** | |
| *********.com | United States | *,***,*** | |
| ***************.***.nl | Netherlands | **,***,*** |