FKIE_CVE-2021-41991

Vulnerability from fkie_nvd - Published: 2021-10-18 14:15 - Updated: 2024-11-21 06:27
Summary
The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.
References
cve@mitre.orghttps://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdfPatch, Third Party Advisory
cve@mitre.orghttps://github.com/strongswan/strongswan/releases/tag/5.9.4Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2021/10/msg00014.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
cve@mitre.orghttps://www.debian.org/security/2021/dsa-4989Third Party Advisory
cve@mitre.orghttps://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdfPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/strongswan/strongswan/releases/tag/5.9.4Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2021/10/msg00014.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4989Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html
Impacted products
Vendor Product Version
strongswan strongswan *
debian debian_linux 9.0
debian debian_linux 10.0
debian debian_linux 11.0
fedoraproject fedora 33
fedoraproject fedora 34
fedoraproject fedora 35
siemens sinema_remote_connect_server -
siemens siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware -
siemens siplus_et_200sp_cp_1542sp-1_irc_tx_rail -
siemens simatic_cp_1243-1_firmware -
siemens simatic_cp_1243-1 -
siemens simatic_cp_1242-7_gprs_v2_firmware -
siemens simatic_cp_1242-7_gprs_v2 -
siemens simatic_net_cp_1243-8_irc_firmware -
siemens simatic_net_cp_1243-8_irc -
siemens scalance_sc632-2c_firmware -
siemens scalance_sc632-2c -
siemens siplus_et_200sp_cp_1543sp-1_isec_firmware -
siemens siplus_et_200sp_cp_1543sp-1_isec -
siemens cp_1543-1_firmware -
siemens cp_1543-1 -
siemens simatic_net_cp_1545-1_firmware -
siemens simatic_net_cp_1545-1 -
siemens simatic_cp_1543sp-1_firmware -
siemens simatic_cp_1543sp-1 -
siemens simatic_net_cp1243-7_lte_eu_firmware -
siemens simatic_net_cp1243-7_lte_eu -
siemens simatic_cp_1243-7_lte\/us_firmware -
siemens simatic_cp_1243-7_lte\/us -
siemens simatic_cp_1542sp-1_firmware -
siemens simatic_cp_1542sp-1 -
siemens scalance_sc636-2c_firmware -
siemens scalance_sc636-2c -
siemens simatic_cp_1542sp-1_irc_firmware -
siemens simatic_cp_1542sp-1_irc -
siemens scalance_sc642-2c_firmware -
siemens scalance_sc642-2c -
siemens scalance_sc646-2c_firmware *
siemens scalance_sc646-2c -
siemens scalance_sc622-2c_firmware -
siemens scalance_sc622-2c -
siemens siplus_s7-1200_cp_1243-1_rail_firmware -
siemens siplus_s7-1200_cp_1243-1_rail -
siemens siplus_s7-1200_cp_1243-1_firmware -
siemens siplus_s7-1200_cp_1243-1 -
siemens siplus_net_cp_1543-1_firmware -
siemens siplus_net_cp_1543-1 -
siemens siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware -
siemens siplus_et_200sp_cp_1543sp-1_isec_tx_rail -

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility."
    },
    {
      "lang": "es",
      "value": "La cach\u00e9 de certificados en memoria en strongSwan versiones anteriores a 5.9.4, presenta un desbordamiento de enteros remoto al recibir muchas peticiones con diferentes certificados para llenar la cach\u00e9 y posteriormente desencadenar la sustituci\u00f3n de las entradas de la cach\u00e9. El c\u00f3digo intenta seleccionar una entrada de cach\u00e9 menos usada mediante un generador de n\u00fameros aleatorios, pero esto no es realizado correctamente. Una ejecuci\u00f3n de c\u00f3digo remota  podr\u00eda ser una peque\u00f1a posibilidad"
    }
  ],
  "id": "CVE-2021-41991",
  "lastModified": "2024-11-21T06:27:02.090",
  "metrics": {
    "cvssMetricV2": [
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        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
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          "baseScore": 7.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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  "published": "2021-10-18T14:15:10.333",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf"
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      "url": "https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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Sightings

Author Source Type Date

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.


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