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CVE-2021-25634— Timestamp Manipulation with Signature Wrapping

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，该漏洞源于应用程序未正确检查ODF文件的数字签名。攻击者可利用该漏洞将文档中的签名算法更改为无效的(或LibreOffice未知的)算法，LibreOffice将错误地将这种使用未知算法的签名表示为可信人员签发的有效签名。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.71% · P50
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I. Basic Information for CVE-2021-25634

Vulnerability Information
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Vulnerability Title
Timestamp Manipulation with Signature Wrapping
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 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
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，该漏洞源于应用程序未正确检查ODF文件的数字签名。攻击者可利用该漏洞将文档中的签名算法更改为无效的(或LibreOffice未知的)算法，LibreOffice将错误地将这种使用未知算法的签名表示为可信人员签发的有效签名。
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 7-0 ~ 7.0.6 -

II. Public POCs for CVE-2021-25634

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III. Intelligence Information for CVE-2021-25634

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Vendor Advisories for CVE-2021-25634 (1)

Other References for CVE-2021-25634 (1)

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: The Document Foundation
Same weakness: CWE-295

V. Comments for CVE-2021-25634

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