Debian DSA-5022-1 : apache-log4j2 - security update

critical Nessus Plugin ID 156124

Synopsis

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

Description

The remote Debian 10 / 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-5022 advisory.

- Apache Log4j2 2.0-beta9 through 2.12.1 and 2.13.0 through 2.15.0 JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints.
An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0, this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects. (CVE-2021-44228)

- It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non- default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in a denial of service (DOS) attack. Log4j 2.15.0 makes a best- effort attempt to restrict JNDI LDAP lookups to localhost by default. Log4j 2.16.0 fixes this issue by removing support for message lookup patterns and disabling JNDI functionality by default. (CVE-2021-45046)

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 apache-log4j2 packages.

For the stable distribution (bullseye), this problem has been fixed in version 2.16.0-1~deb11u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1001729

http://www.nessus.org/u?a7f9f2b8

https://www.debian.org/security/2021/dsa-5022

https://security-tracker.debian.org/tracker/CVE-2021-44228

https://security-tracker.debian.org/tracker/CVE-2021-45046

https://packages.debian.org/source/buster/apache-log4j2

https://packages.debian.org/source/bullseye/apache-log4j2

Plugin Details

Severity: Critical

ID: 156124

File Name: debian_DSA-5022.nasl

Version: 1.5

Type: local

Agent: unix

Published: 12/16/2021

Updated: 8/15/2022

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information

VPR

Risk Factor: Critical

Score: 10

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 8.1

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

CVSS Score Source: CVE-2021-44228

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9.5

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

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:liblog4j2-java:*:*:*:*:*:*:*

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/16/2021

Vulnerability Publication Date: 12/10/2021

CISA Known Exploited Dates: 12/24/2021

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2021-44228, CVE-2021-45046

IAVA: 2021-A-0573, 0001-A-0650