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

Quick assessment

Affected
The Document Foundation LibreOffice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibreOffice是文档基金会（The Document Foundation，tdf）的一套开源的办公软件套件。该产品包含Writer（文本文档）、Calc（电子表格）和Impress（演示文稿）等应用程序。 libreoffice 存在信任管理问题漏洞，该漏洞源于libreoffice:签名的信任验证不正确，具有不明确的KeyInfo子节点。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.95% · P60

Possible ATT&CK Techniques 1 AI

T1553.005 · Mark-of-the-Web Bypass
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I. Basic Information for CVE-2021-25636

Vulnerability Information
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Vulnerability Title
Incorrect trust validation of signature with ambiguous KeyInfo children
Source: CVE Program / CVE List V5
Vulnerability 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 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
LibreOffice 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreOffice是文档基金会（The Document Foundation，tdf）的一套开源的办公软件套件。该产品包含Writer（文本文档）、Calc（电子表格）和Impress（演示文稿）等应用程序。 libreoffice 存在信任管理问题漏洞，该漏洞源于libreoffice:签名的信任验证不正确，具有不明确的KeyInfo子节点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Document Foundation LibreOffice 7.2 ~ 7.2.5 -

II. Public POCs for CVE-2021-25636

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III. Intelligence Information for CVE-2021-25636

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Mailing List Discussions for CVE-2021-25636 (2)

Other References for CVE-2021-25636 (1)

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: The Document Foundation
Same weakness: CWE-347

V. Comments for CVE-2021-25636

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