7.5
HIGH
CVE-2021-25633
LibreOffice Digital Signature Certificate Validation Bypass
Description

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.

INFO

Published Date :

Oct. 11, 2021, 5:15 p.m.

Last Modified :

Oct. 18, 2021, 6:13 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-25633 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Debian debian_linux
1 Libreoffice libreoffice
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-25633.

URL Resource
https://www.debian.org/security/2021/dsa-4988 Third Party Advisory
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25633 Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-25633 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-25633 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Oct. 18, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    Changed Reference Type https://www.debian.org/security/2021/dsa-4988 No Types Assigned https://www.debian.org/security/2021/dsa-4988 Third Party Advisory
    Changed Reference Type https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25633 No Types Assigned https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25633 Vendor Advisory
    Added CWE NIST CWE-295
    Added CPE Configuration OR *cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (excluding) 7.0.6 *cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:* versions from (including) 7.1.0 up to (excluding) 7.1.2
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Oct. 17, 2021

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2021/dsa-4988 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-25633 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-25633 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.15 }} 0.04%

score

0.52005

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability