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Debian DLA-2437-1 : krb5 security update

high Nessus Plugin ID 142616

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Synopsis

The remote Debian host is missing a security update.

Description

It was discovered that there was a denial of service vulnerability in the MIT Kerberos network authentication system, krb5. The lack of a limit in the ASN.1 decoder could lead to infinite recursion and allow an attacker to overrun the stack and cause the process to crash.

For Debian 9 'Stretch', this problem has been fixed in version 1.15-1+deb9u2.

We recommend that you upgrade your krb5 packages.

For the detailed security status of krb5 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/krb5

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html

https://packages.debian.org/source/stretch/krb5

https://security-tracker.debian.org/tracker/source-package/krb5

Plugin Details

Severity: High

ID: 142616

File Name: debian_DLA-2437.nasl

Version: 1.5

Type: local

Agent: unix

Published: 11/9/2020

Updated: 12/6/2022

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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: 6.5

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: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: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-dev, 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: 11/7/2020

Vulnerability Publication Date: 11/6/2020

Reference Information

CVE: CVE-2020-28196