CVE-2021-25635 (GCVE-0-2021-25635)

Vulnerability from cvelistv5 – Published: 2025-03-21 14:52 – Updated: 2025-03-21 15:13
VLAI
Title
Content Manipulation with Certificate Validation Attack
Summary
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.
Severity
5.2 (Medium)
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
The Document Foundation LibreOffice Affected: 7.0 , < 7.0.5 (7.0 series)
Affected: 7.1 , < 7.1.1 (7.1 series)
Create a notification for this product.
Date Public
2021-10-11 14:00
Credits
NDS of Ruhr University Bochum
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-25635",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-03-21T15:13:07.905943Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-03-21T15:13:24.100Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "LibreOffice",
          "vendor": "The Document Foundation",
          "versions": [
            {
              "lessThan": "7.0.5",
              "status": "affected",
              "version": "7.0",
              "versionType": "7.0 series"
            },
            {
              "lessThan": "7.1.1",
              "status": "affected",
              "version": "7.1",
              "versionType": "7.1 series"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "NDS of Ruhr University Bochum"
        }
      ],
      "datePublic": "2021-10-11T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003eAn Improper Certificate Validation vulnerability in LibreOffice allowed \nan attacker to self sign an ODF document, with a signature untrusted by \nthe target, then modify it to change the signature algorithm to an \ninvalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a \nvalid signature issued by a trusted person\u003cbr\u003e\u003c/div\u003e\u003cp\u003eThis issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.\u003c/p\u003e"
            }
          ],
          "value": "An Improper Certificate Validation vulnerability in LibreOffice allowed \nan attacker to self sign an ODF document, with a signature untrusted by \nthe target, then modify it to change the signature algorithm to an \ninvalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a \nvalid signature issued by a trusted person\n\n\nThis issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-475",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-475 Signature Spoofing by Improper Validation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 5.2,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "CWE-295 Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-03-21T14:52:50.484Z",
        "orgId": "4fe7d05b-1353-44cc-8b7a-1e416936dff2",
        "shortName": "Document Fdn."
      },
      "references": [
        {
          "url": "https://www.libreoffice.org/about-us/security/advisories/cve-2021-25635/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Content Manipulation with Certificate Validation Attack",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4fe7d05b-1353-44cc-8b7a-1e416936dff2",
    "assignerShortName": "Document Fdn.",
    "cveId": "CVE-2021-25635",
    "datePublished": "2025-03-21T14:52:50.484Z",
    "dateReserved": "2021-01-19T22:48:43.994Z",
    "dateUpdated": "2025-03-21T15:13:24.100Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-25635",
      "date": "2026-05-28",
      "epss": "0.00045",
      "percentile": "0.14166"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-25635\",\"sourceIdentifier\":\"security@documentfoundation.org\",\"published\":\"2025-03-21T15:15:35.707\",\"lastModified\":\"2025-12-10T19:18:58.750\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An Improper Certificate Validation vulnerability in LibreOffice allowed \\nan attacker to self sign an ODF document, with a signature untrusted by \\nthe target, then modify it to change the signature algorithm to an \\ninvalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a \\nvalid signature issued by a trusted person\\n\\n\\nThis issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.\"},{\"lang\":\"es\",\"value\":\"Una vulnerabilidad de validaci\u00f3n de certificado incorrecta en LibreOffice permiti\u00f3 a un atacante autofirmar un documento ODF, con una firma que no era de confianza para el destino, y luego modificarlo para cambiar el algoritmo de firma a uno no v\u00e1lido (o desconocido para LibreOffice) y LibreOffice presentar\u00eda incorrectamente dicha firma con un algoritmo desconocido como una firma v\u00e1lida emitida por una persona confiable. Este problema afecta a LibreOffice: desde 7.0 antes de 7.0.5, desde 7.1 antes de 7.1.1.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security@documentfoundation.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":5.2,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"HIGH\",\"subIntegrityImpact\":\"HIGH\",\"subAvailabilityImpact\":\"HIGH\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security@documentfoundation.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-295\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.0.0\",\"versionEndExcluding\":\"7.0.5.1\",\"matchCriteriaId\":\"12D2CA40-15EE-4996-B754-CCD7128B4FDD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:libreoffice:libreoffice:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.1.0.0\",\"versionEndIncluding\":\"7.1.1.1\",\"matchCriteriaId\":\"381AA7ED-22CB-4BC0-8DF5-6CE16A741C26\"}]}]}],\"references\":[{\"url\":\"https://www.libreoffice.org/about-us/security/advisories/cve-2021-25635/\",\"source\":\"security@documentfoundation.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-25635\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-03-21T15:13:07.905943Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-21T15:13:15.453Z\"}}], \"cna\": {\"title\": \"Content Manipulation with Certificate Validation Attack\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"NDS of Ruhr University Bochum\"}], \"impacts\": [{\"capecId\": \"CAPEC-475\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-475 Signature Spoofing by Improper Validation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.2, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"HIGH\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"HIGH\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"HIGH\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"The Document Foundation\", \"product\": \"LibreOffice\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.0\", \"lessThan\": \"7.0.5\", \"versionType\": \"7.0 series\"}, {\"status\": \"affected\", \"version\": \"7.1\", \"lessThan\": \"7.1.1\", \"versionType\": \"7.1 series\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2021-10-11T14:00:00.000Z\", \"references\": [{\"url\": \"https://www.libreoffice.org/about-us/security/advisories/cve-2021-25635/\"}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"An Improper Certificate Validation vulnerability in LibreOffice allowed \\nan attacker to self sign an ODF document, with a signature untrusted by \\nthe target, then modify it to change the signature algorithm to an \\ninvalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a \\nvalid signature issued by a trusted person\\n\\n\\nThis issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cdiv\u003eAn Improper Certificate Validation vulnerability in LibreOffice allowed \\nan attacker to self sign an ODF document, with a signature untrusted by \\nthe target, then modify it to change the signature algorithm to an \\ninvalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a \\nvalid signature issued by a trusted person\u003cbr\u003e\u003c/div\u003e\u003cp\u003eThis issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-295\", \"description\": \"CWE-295 Improper Certificate Validation\"}]}], \"providerMetadata\": {\"orgId\": \"4fe7d05b-1353-44cc-8b7a-1e416936dff2\", \"shortName\": \"Document Fdn.\", \"dateUpdated\": \"2025-03-21T14:52:50.484Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-25635\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-21T15:13:24.100Z\", \"dateReserved\": \"2021-01-19T22:48:43.994Z\", \"assignerOrgId\": \"4fe7d05b-1353-44cc-8b7a-1e416936dff2\", \"datePublished\": \"2025-03-21T14:52:50.484Z\", \"assignerShortName\": \"Document Fdn.\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.