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Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS / 22.04 LTS : Kerberos vulnerabilities (USN-5828-1)

high Nessus Plugin ID 170651

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS / 22.04 LTS / 22.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5828-1 advisory.

 - A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request. (CVE-2018-20217)

 - PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has a similar bug.
 (CVE-2022-42898)

Note that Nessus has not tested for these issues 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-5828-1

Plugin Details

Severity: High

ID: 170651

File Name: ubuntu_USN-5828-1.nasl

Version: 1.2

Type: local

Agent: unix

Published: 1/25/2023

Updated: 10/16/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Low

Base Score: 3.5

Temporal Score: 2.7

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

CVSS Score Source: CVE-2018-20217

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

CVSS Score Source: CVE-2022-42898

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:esm, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-: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-mit12, p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit9, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit11, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit12, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit8, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit9, p-cpe:/a:canonical:ubuntu_linux:libkdb5-10, 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: 1/25/2023

Vulnerability Publication Date: 12/8/2018

Reference Information

CVE: CVE-2018-20217, CVE-2022-42898

USN: 5828-1