USN-4635-1

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Source
https://ubuntu.com/security/notices/USN-4635-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4635-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4635-1
Upstream
Related
Published
2020-11-17T13:35:56.675240Z
Modified
2025-10-13T04:35:17Z
Summary
krb5 vulnerability
Details

Demi Obenour discovered that Kerberos incorrectly handled certain ASN.1. An attacker could possibly use this issue to cause a denial of service.

References

Affected packages

Ubuntu:Pro:14.04:LTS / krb5

Package

Name
krb5
Purl
pkg:deb/ubuntu/krb5@1.12+dfsg-2ubuntu5.4+esm2?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.12+dfsg-2ubuntu5.4+esm2

Affected versions

1.*

1.10.1+dfsg-6.1ubuntu1
1.11.3+dfsg-3ubuntu2
1.12+dfsg-2ubuntu1
1.12+dfsg-2ubuntu2
1.12+dfsg-2ubuntu3
1.12+dfsg-2ubuntu4
1.12+dfsg-2ubuntu4.2
1.12+dfsg-2ubuntu5
1.12+dfsg-2ubuntu5.1
1.12+dfsg-2ubuntu5.2
1.12+dfsg-2ubuntu5.3
1.12+dfsg-2ubuntu5.4
1.12+dfsg-2ubuntu5.4+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-kdc",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-locales",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-multidev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-otp",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-user",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libgssrpc4",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libk5crypto3",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkadm5clnt-mit9",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkadm5srv-mit8",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkadm5srv-mit9",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkdb5-7",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrad-dev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrad0",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrb5-3",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrb5-dev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrb5support0",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:14.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-28196",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:16.04:LTS / krb5

Package

Name
krb5
Purl
pkg:deb/ubuntu/krb5@1.13.2+dfsg-5ubuntu2.2?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.13.2+dfsg-5ubuntu2.2

Affected versions

1.*

1.13.2+dfsg-2
1.13.2+dfsg-3
1.13.2+dfsg-4
1.13.2+dfsg-5
1.13.2+dfsg-5ubuntu1
1.13.2+dfsg-5ubuntu2
1.13.2+dfsg-5ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-kdc",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-locales",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-multidev",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-otp",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "krb5-user",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libgssrpc4",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libk5crypto3",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkadm5clnt-mit9",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkadm5srv-mit9",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkdb5-8",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkrad-dev",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkrad0",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkrb5-3",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkrb5-dev",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        },
        {
            "binary_name": "libkrb5support0",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-28196",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:18.04:LTS / krb5

Package

Name
krb5
Purl
pkg:deb/ubuntu/krb5@1.16-2ubuntu0.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.16-2ubuntu0.2

Affected versions

1.*

1.15.1-2
1.16-2
1.16-2build1
1.16-2ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-kdc",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-kpropd",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-locales",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-multidev",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-otp",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "krb5-user",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libgssrpc4",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libk5crypto3",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkadm5clnt-mit11",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkadm5srv-mit11",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkdb5-9",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkrad-dev",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkrad0",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkrb5-3",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkrb5-dev",
            "binary_version": "1.16-2ubuntu0.2"
        },
        {
            "binary_name": "libkrb5support0",
            "binary_version": "1.16-2ubuntu0.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-28196",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:20.04:LTS / krb5

Package

Name
krb5
Purl
pkg:deb/ubuntu/krb5@1.17-6ubuntu4.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.17-6ubuntu4.1

Affected versions

1.*

1.17-6
1.17-6ubuntu3
1.17-6ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-kdc",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-kpropd",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-locales",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-multidev",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-otp",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "krb5-user",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libgssrpc4",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libk5crypto3",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkadm5clnt-mit11",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkadm5srv-mit11",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkdb5-9",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkrad-dev",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkrad0",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkrb5-3",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkrb5-dev",
            "binary_version": "1.17-6ubuntu4.1"
        },
        {
            "binary_name": "libkrb5support0",
            "binary_version": "1.17-6ubuntu4.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-28196",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}