CVE-2021-44228

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Last Modified: UTC

Critical Critical Impact What does this mean?
9.8 CVSS v3 Base Score

Description

A flaw was found in the Apache Log4j logging library in versions from 2.0.0 and before 2.15.0. A remote attacker who can control log messages or log message parameters, can execute arbitrary code on the server via JNDI LDAP endpoint.

Statement

This issue only affects log4j versions between 2.0 and 2.14.1. In order to exploit this flaw you need:

  • A remotely accessible endpoint with any protocol (HTTP, TCP, etc) that allows an attacker to send arbitrary data,
  • A log statement in the endpoint that logs the attacker controlled data.

In Red Hat OpenShift Logging the vulnerable log4j library is shipped in the Elasticsearch components. Because Elasticsearch is not susceptible to remote code execution with this vulnerability due to use of the Java Security Manager and because access to these components is limited, the impact by this vulnerability is reduced to Moderate.

As per upstream applications using Log4j 1.x may be impacted by this flaw if their configuration uses JNDI. However, the risk is much lower. This flaw in Log4j 1.x is tracked via https://access.redhat.com/security/cve/CVE-2021-4104 and has been rated as having Moderate security impact.

CodeReady Studio version 12.21.1 was released containing a fix for this vulnerability.

The following products are NOT affected by this flaw and have been explicitly listed here for the benefit of our customers.

  • Red Hat Enterprise Linux
  • Red Hat Advanced Cluster Management for Kubernetes
  • Red Hat Advanced Cluster Security for Kubernetes
  • Red Hat Ansible Automation Platform (Engine and Tower)
  • Red Hat Certificate System
  • Red Hat Directory Server
  • Red Hat Identity Management
  • Red Hat CloudForms
  • Red Hat Update Infrastructure
  • Red Hat Satellite
  • Red Hat Ceph Storage
  • Red Hat Gluster Storage
  • Red Hat OpenShift Data Foundation
  • Red Hat OpenStack Platform
  • Red Hat Virtualization
  • Red Hat Single Sign-On
  • Red Hat 3scale API Management

Mitigation

For Log4j versions >=2.10
set the system property log4j2.formatMsgNoLookups or the environment variable LOG4J_FORMAT_MSG_NO_LOOKUPS to true

For Log4j versions >=2.7 and <=2.14.1
all PatternLayout patterns can be modified to specify the message converter as %m{nolookups} instead of just %m

For Log4j versions >=2.0-beta9 and <=2.10.0
remove the JndiLookup class from the classpath. For example: 

zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class

On OpenShift 4 and in OpenShift Logging, the above mitigation can be applied by following the steps in this article: https://access.redhat.com/solutions/6578421

On OpenShift 3.11, mitigation to the affected Elasticsearch component can be applied by following the steps in this article: https://access.redhat.com/solutions/6578441

Additional Information

External References

Content from www.cve.org is not included.https://www.cve.org/CVERecord?id=CVE-2021-44228

Content from nvd.nist.gov is not included.https://nvd.nist.gov/vuln/detail/CVE-2021-44228

Content from github.com is not included.https://github.com/advisories/GHSA-jfh8-c2jp-5v3q

Content from logging.apache.org is not included.https://logging.apache.org/log4j/2.x/security.html

Content from www.lunasec.io is not included.https://www.lunasec.io/docs/blog/log4j-zero-day/

Content from www.cisa.gov is not included.https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Affected Packages and Issued Red Hat Security Errata

Products / Services Components State Errata
A-MQ Clients 2 log4j-core Not affected
OpenShift Logging 5.0 openshift-logging/elasticsearch6-rhel8 Fixed RHSA-2021:5137
OpenShift Logging 5.1 openshift-logging/elasticsearch6-rhel8 Fixed RHSA-2021:5128
OpenShift Logging 5.2 openshift-logging/elasticsearch6-rhel8 Fixed RHSA-2021:5127
OpenShift Logging 5.3 openshift-logging/elasticsearch6-rhel8 Fixed RHSA-2021:5129
RHPAM 7.11.1 Fixed RHSA-2022:0082
RHPAM 7.12.0 log4j-core Fixed RHSA-2022:0296
Red Hat 3scale API Management Platform 2 log4j Not affected
Red Hat AMQ Broker 7 log4j Not affected
Red Hat AMQ Streams 1.6.5 Fixed RHSA-2021:5133
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authorities (CNA) source for its products and services (see Red Hat classifications ).

CVSS v3 Score Breakdown Red Hat NVD
CVSS v3 Base Score 9.8 10
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Changed
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High

CVSS v3 Vector

Red Hat CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

 For open source software shipped by multiple vendors, the CVSS base scores may vary for each vendor's version depending on the version they ship, how they ship it, the platform, and even how the software is compiled. This makes scoring of vulnerabilities difficult for third-party vulnerability databases such as NVD that only provide a single CVSS base score for each vulnerability. Red Hat scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?
  • "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected.
  • "Affected" means that our Analysis Team has determined that this product is affected by this vulnerability and might release a fix to address this in the near future.

What can I do if my product is listed as "Will not fix"?

 A "will not fix" status means that a fix for an affected product version is not planned or not possible due to complexity, which may create additional risk.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Upgrade to a supported product version that includes a fix for this vulnerability (recommended).
  • Apply a mitigation (if one exists).
  • Open a This content is not included.support case to request a prioritization of releasing a fix for this vulnerability.

What can I do if my product is listed as "Fix deferred"?

 A deferred status means that a fix for an affected product version is not guaranteed due to higher-priority development work.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Apply a mitigation (if one exists).
  • Open a This content is not included.support case to request a prioritization of releasing a fix for this vulnerability.
  • Red Hat Engineering focuses on addressing high-priority issues based on their complexity or limited lifecycle support. Therefore, lower-priority issues will not receive immediate fixes.

What is a mitigation?

 A mitigation is an action that can be taken to reduce the impact of a security vulnerability, without deploying any fixes.

I have a Red Hat product but it is not in the above list, is it affected?

 The listed products were found to include one or more of the components that this vulnerability affects. These products underwent a thorough evaluation to determine their affectedness by this vulnerability. Note that layered products (such as container-based offerings) that consume affected components from any of the products listed in this table may be affected and are not represented.

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

 In order to maintain code stability and compatibility, Red Hat usually does not rebase packages to entirely new versions. Instead, we backport fixes and new features to an older version of the package we distribute. This can result in some security scanners that only consider the package version to report the package as vulnerable. To avoid this, we suggest that you use an approved vulnerability scanner from our This content is not included.Red Hat Vulnerability Scanner Certification program.

My product is listed as "Out of Support Scope". What does this mean?

 When a product is listed as "Out of Support Scope", it means a vulnerability with the impact level assigned to this CVE is no longer covered by its current support lifecycle phase. The product has been identified to contain the impacted component, but analysis to determine whether it is affected or not by this vulnerability was not performed. The product should be assumed to be affected. Customers are advised to apply any mitigation options documented on this page, consider removing or disabling the impacted component, or upgrade to a supported version of the product that has an update available.