An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF document, with a signature untrusted by the target, then modify it to change the signature algorithm to an invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a valid signature issued by a trusted person This issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0242 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

      CVE-2021-25633:
      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.

      CVE-2021-25634:
      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.

      CVE-2021-25635:
      It is possible for an attacker to manipulate documents to appear to be signed by a trusted source. All     versions of Apache OpenOffice up to 4.1.10 are affected. Users are advised to update to version 4.1.11.
    See CVE-2021-25635 for the LibreOffice advisory.

      CVE-2021-25636:
      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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0201 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-25633:
    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.

    CVE-2021-25634:
    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.

    CVE-2021-25635:
    A flaw was found in LibreOffice, where it improperly validated signatures for algorithms that were not     verified. This flaw leads to LibreOffice presenting a valid signature when the validity of the signature     was not verified.  The highest threat from this vulnerability is to confidentiality and integrity.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF     document, with a signature untrusted by the target, then modify it to change the signature algorithm to an     invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature     with an unknown algorithm as a valid signature issued by a trusted person This issue affects LibreOffice:
    from 7.0 before 7.0.5, from 7.1 before 7.1.1. (CVE-2021-25635)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2022:1766 advisory.

  - 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. (CVE-2021-25634)

  - 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. (CVE-2021-25633)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2022-1766 advisory.

    - Resolves: rhbz#2013858 CVE-2021-25633
    - Resolves: rhbz#2014215 CVE-2021-25634
    - Resolves: rhbz#2014209 CVE-2021-25635

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2022:1766 advisory.

  - 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. (CVE-2021-25633)

  - 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. (CVE-2021-25634)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2022:1766 advisory.

    LibreOffice is an open source, community-developed office productivity suite. It includes key desktop     applications, such as a word processor, a spreadsheet, a presentation manager, a formula editor, and a     drawing program. LibreOffice replaces OpenOffice and provides a similar but enhanced and extended office     suite.

    Security Fix(es):

    * libreoffice: Content Manipulation with Double Certificate Attack (CVE-2021-25633)

    * libreoffice: Timestamp Manipulation with Signature Wrapping (CVE-2021-25634)

    * libreoffice: Content Manipulation with Certificate Validation Attack (CVE-2021-25635)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2022:1766 advisory.

  - libreoffice: Content Manipulation with Double Certificate Attack (CVE-2021-25633)

  - libreoffice: Timestamp Manipulation with Signature Wrapping (CVE-2021-25634)

  - libreoffice: Content Manipulation with Certificate Validation Attack (CVE-2021-25635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
238895	TencentOS Server 3: libreoffice (TSSA-2022:0242)	Nessus	Tencent Local Security Checks	high
236067	Alibaba Cloud Linux 3 : 0201: libreoffice (ALINUX3-SA-2022:0201)	Nessus	Alibaba Cloud Linux Local Security Checks	high
223716	Linux Distros Unpatched Vulnerability : CVE-2021-25635	Nessus	Misc.	medium
167826	Rocky Linux 8 : libreoffice (RLSA-2022:1766)	Nessus	Rocky Linux Local Security Checks	medium
161277	Oracle Linux 8 : libreoffice (ELSA-2022-1766)	Nessus	Oracle Linux Local Security Checks	medium
161111	AlmaLinux 8 : libreoffice (ALSA-2022:1766)	Nessus	Alma Linux Local Security Checks	medium
161046	RHEL 8 : libreoffice (RHSA-2022:1766)	Nessus	Red Hat Local Security Checks	medium
160909	CentOS 8 : libreoffice (CESA-2022:1766)	Nessus	CentOS Local Security Checks	medium

Detections

Analytics

CVE-2021-25635

medium

Tenable Plugins

high

high

medium

medium

medium

medium

medium

medium