USN-4635-1

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Please try reporting it to the source first.

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.osv.dev/v1/vulns/USN-4635-1

Upstream

CVE-2020-28196

UBUNTU-CVE-2020-28196

Related

UBUNTU-CVE-2020-28196

Published

2020-11-17T13:35:56.675240Z

Modified

2025-09-08T16:36:52Z

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:14.04:LTS / krb5

Package

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

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

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libkadm5srv-mit9",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkadm5srv-mit8",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libk5crypto3",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-user",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libgssrpc4",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrb5support0",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrb5-dev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkrb5-3",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-otp",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libkadm5clnt-mit9",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-multidev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-locales",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-kdc",
            "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": "libkdb5-7",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        },
        {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
        }
    ],
    "availability": "No subscription required"
}

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"
}

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"
}

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"
}