Debian DLA-2771-1 : krb5 - LTS security update

medium Nessus Plugin ID 153808

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2771 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)

- MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to cause a denial of service (NULL pointer dereference) or bypass a DN container check by supplying tagged data that is internal to the database module. (CVE-2018-5729)

- MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to circumvent a DN containership check by supplying both a linkdn and containerdn database argument, or by supplying a DN string which is a left extension of a container DN string but is not hierarchically within the container DN. (CVE-2018-5730)

- The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
(CVE-2021-37750)

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

Solution

Upgrade the krb5 packages.

For Debian 9 stretch, these problems have been fixed in version 1.15-1+deb9u3.

Plugin Details

Severity: Medium

ID: 153808

File Name: debian_DLA-2771.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 10/1/2021

Updated: 7/19/2022

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

CVSS Score Source: CVE-2018-5729

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:krb5-admin-server, p-cpe:/a:debian:debian_linux:krb5-doc, p-cpe:/a:debian:debian_linux:krb5-gss-samples, p-cpe:/a:debian:debian_linux:krb5-k5tls, p-cpe:/a:debian:debian_linux:krb5-kdc, p-cpe:/a:debian:debian_linux:krb5-kdc-ldap, p-cpe:/a:debian:debian_linux:krb5-kpropd, p-cpe:/a:debian:debian_linux:krb5-locales, p-cpe:/a:debian:debian_linux:krb5-multidev, p-cpe:/a:debian:debian_linux:krb5-otp, p-cpe:/a:debian:debian_linux:krb5-pkinit, p-cpe:/a:debian:debian_linux:krb5-user, p-cpe:/a:debian:debian_linux:libgssapi-krb5-2, p-cpe:/a:debian:debian_linux:libgssrpc4, p-cpe:/a:debian:debian_linux:libk5crypto3, p-cpe:/a:debian:debian_linux:libkadm5clnt-mit11, p-cpe:/a:debian:debian_linux:libkadm5srv-mit11, p-cpe:/a:debian:debian_linux:libkdb5-8, p-cpe:/a:debian:debian_linux:libkrad-dev, p-cpe:/a:debian:debian_linux:libkrad0, p-cpe:/a:debian:debian_linux:libkrb5-3, p-cpe:/a:debian:debian_linux:libkrb5-dbg, p-cpe:/a:debian:debian_linux:libkrb5-dev, p-cpe:/a:debian:debian_linux:libkrb5support0, cpe:/o:debian:debian_linux:9.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/30/2021

Vulnerability Publication Date: 2/13/2018

Reference Information

CVE: CVE-2018-20217, CVE-2018-5729, CVE-2018-5730, CVE-2021-37750

IAVB: 2021-B-0054-S

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