Vulnerability-Lookup

oesa-2021-1026

Vulnerability from osv_openeuler

Published

2021-02-05 11:04

Modified

2026-08-06 11:04

Summary

krb5 security update

Details

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.\r\n\r\n Security Fix(es):\r\n\r\n MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.(CVE-2020-28196)\r\n\r\n

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-28196	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "krb5-1.18.2-2.oe1.aarch64.rpm",
          "krb5-debuginfo-1.18.2-2.oe1.aarch64.rpm",
          "krb5-debugsource-1.18.2-2.oe1.aarch64.rpm",
          "krb5-devel-1.18.2-2.oe1.aarch64.rpm",
          "krb5-help-1.18.2-2.oe1.aarch64.rpm",
          "krb5-client-1.18.2-2.oe1.aarch64.rpm",
          "krb5-libs-1.18.2-2.oe1.aarch64.rpm",
          "krb5-server-1.18.2-2.oe1.aarch64.rpm",
          "krb5-1.18.2-2.oe1.aarch64.rpm",
          "krb5-debuginfo-1.18.2-2.oe1.aarch64.rpm",
          "krb5-debugsource-1.18.2-2.oe1.aarch64.rpm",
          "krb5-devel-1.18.2-2.oe1.aarch64.rpm",
          "krb5-help-1.18.2-2.oe1.aarch64.rpm",
          "krb5-client-1.18.2-2.oe1.aarch64.rpm",
          "krb5-libs-1.18.2-2.oe1.aarch64.rpm",
          "krb5-server-1.18.2-2.oe1.aarch64.rpm"
        ],
        "src": [
          "krb5-1.18.2-2.oe1.src.rpm",
          "krb5-1.18.2-2.oe1.src.rpm"
        ],
        "x86_64": [
          "krb5-1.18.2-2.oe1.x86_64.rpm",
          "krb5-debuginfo-1.18.2-2.oe1.x86_64.rpm",
          "krb5-debugsource-1.18.2-2.oe1.x86_64.rpm",
          "krb5-devel-1.18.2-2.oe1.x86_64.rpm",
          "krb5-help-1.18.2-2.oe1.x86_64.rpm",
          "krb5-client-1.18.2-2.oe1.x86_64.rpm",
          "krb5-libs-1.18.2-2.oe1.x86_64.rpm",
          "krb5-server-1.18.2-2.oe1.x86_64.rpm",
          "krb5-1.18.2-2.oe1.x86_64.rpm",
          "krb5-debuginfo-1.18.2-2.oe1.x86_64.rpm",
          "krb5-debugsource-1.18.2-2.oe1.x86_64.rpm",
          "krb5-devel-1.18.2-2.oe1.x86_64.rpm",
          "krb5-help-1.18.2-2.oe1.x86_64.rpm",
          "krb5-client-1.18.2-2.oe1.x86_64.rpm",
          "krb5-libs-1.18.2-2.oe1.x86_64.rpm",
          "krb5-server-1.18.2-2.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS",
        "name": "krb5",
        "purl": "pkg:rpm/openEuler/krb5\u0026distro=openEuler-20.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.2-2.oe1"
            }
          ],
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        }
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    },
    {
      "ecosystem_specific": {
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          "krb5-debuginfo-1.18.2-2.oe1.aarch64.rpm",
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          "krb5-devel-1.18.2-2.oe1.aarch64.rpm",
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          "krb5-client-1.18.2-2.oe1.aarch64.rpm",
          "krb5-libs-1.18.2-2.oe1.aarch64.rpm",
          "krb5-server-1.18.2-2.oe1.aarch64.rpm"
        ],
        "src": [
          "krb5-1.18.2-2.oe1.src.rpm"
        ],
        "x86_64": [
          "krb5-1.18.2-2.oe1.x86_64.rpm",
          "krb5-debuginfo-1.18.2-2.oe1.x86_64.rpm",
          "krb5-debugsource-1.18.2-2.oe1.x86_64.rpm",
          "krb5-devel-1.18.2-2.oe1.x86_64.rpm",
          "krb5-help-1.18.2-2.oe1.x86_64.rpm",
          "krb5-client-1.18.2-2.oe1.x86_64.rpm",
          "krb5-libs-1.18.2-2.oe1.x86_64.rpm",
          "krb5-server-1.18.2-2.oe1.x86_64.rpm"
        ]
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      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "krb5",
        "purl": "pkg:rpm/openEuler/krb5\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.2-2.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.\\r\\n\\r\\n\r\nSecurity Fix(es):\\r\\n\\r\\n\r\nMIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.(CVE-2020-28196)\\r\\n\\r\\n",
  "id": "OESA-2021-1026",
  "modified": "2026-08-06T11:04:15Z",
  "published": "2021-02-05T11:04:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1026"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-28196"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "krb5 security update",
  "upstream": [
    "CVE-2020-28196"
  ]
}

CVE-2020-28196 (GCVE-0-2020-28196)

Vulnerability from cvelistv5 – Published: 2020-11-06 07:07 – Updated: 2025-12-03 18:15

Summary

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-03 18:14 UTC

CWE

n/a
CWE-674 - Uncontrolled Recursion

Assigner

mitre mitre root

References

14 references

URL	Tags
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202011-17	vendor-advisoryx_refsource_GENTOO
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.debian.org/security/2020/dsa-4795	vendor-advisoryx_refsource_DEBIAN
https://www.oracle.com/security-alerts/cpuApr2021.html	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021051…	x_refsource_CONFIRM
https://github.com/krb5/krb5/commit/57415dda6cf04…	x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2020120…	x_refsource_CONFIRM
https://lists.apache.org/thread.html/rf4c02775860…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r58af02e294b…	mailing-listx_refsource_MLIST
https://www.oracle.com//security-alerts/cpujul2021.html	x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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            },
            {
              "name": "FEDORA-2020-0df38b2843",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7/"
            },
            {
              "name": "DSA-4795",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2020/dsa-4795"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuApr2021.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20210513-0002/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20210513-0002/"
            },
            {
              "name": "https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd",
              "refsource": "CONFIRM",
              "url": "https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20201202-0001/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20201202-0001/"
            },
            {
              "name": "[bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E"
            },
            {
              "name": "[bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3E"
            },
            {
              "name": "https://www.oracle.com//security-alerts/cpujul2021.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2020-28196",
    "datePublished": "2020-11-06T07:07:38.000Z",
    "dateReserved": "2020-11-03T00:00:00.000Z",
    "dateUpdated": "2025-12-03T18:15:34.180Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.