Detections
Analytics

Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Kerberos vulnerability (USN-4635-1)

high Nessus Plugin ID 142967

Language:

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 host has packages installed that are affected by a vulnerability as referenced in the USN-4635-1 advisory.

 - 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)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-4635-1

Plugin Details

Severity: High

ID: 142967

File Name: ubuntu_USN-4635-1.nasl

Version: 1.6

Type: local

Agent: unix

Published: 11/17/2020

Updated: 10/21/2023

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2020-28196

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:krb5-admin-server, p-cpe:/a:canonical:ubuntu_linux:krb5-gss-samples, p-cpe:/a:canonical:ubuntu_linux:krb5-k5tls, p-cpe:/a:canonical:ubuntu_linux:krb5-kdc, p-cpe:/a:canonical:ubuntu_linux:krb5-kdc-ldap, p-cpe:/a:canonical:ubuntu_linux:krb5-kpropd, p-cpe:/a:canonical:ubuntu_linux:krb5-locales, p-cpe:/a:canonical:ubuntu_linux:krb5-multidev, p-cpe:/a:canonical:ubuntu_linux:krb5-otp, p-cpe:/a:canonical:ubuntu_linux:krb5-pkinit, p-cpe:/a:canonical:ubuntu_linux:krb5-user, p-cpe:/a:canonical:ubuntu_linux:libgssapi-krb5-2, p-cpe:/a:canonical:ubuntu_linux:libgssrpc4, p-cpe:/a:canonical:ubuntu_linux:libk5crypto3, p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit11, p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit9, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit11, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit8, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit9, p-cpe:/a:canonical:ubuntu_linux:libkdb5-7, p-cpe:/a:canonical:ubuntu_linux:libkdb5-8, p-cpe:/a:canonical:ubuntu_linux:libkdb5-9, p-cpe:/a:canonical:ubuntu_linux:libkrad-dev, p-cpe:/a:canonical:ubuntu_linux:libkrad0, p-cpe:/a:canonical:ubuntu_linux:libkrb5-3, p-cpe:/a:canonical:ubuntu_linux:libkrb5-dev, p-cpe:/a:canonical:ubuntu_linux:libkrb5support0

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/17/2020

Vulnerability Publication Date: 11/6/2020

Reference Information

CVE: CVE-2020-28196

USN: 4635-1