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Reload4j

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Reload4j[1] was created by the original author of log4j 1.x, Ceki Gülcü. Reload4j is a fork of log4j version 1.2.17. It preserves the same java package name space, in this case org.apache.log4j. However, for reasons of trademark protection, it is published under the "ch.qos.reload4j" groupId[2] in Apache Maven Central. It can be thus considered as a drop-in replacement for log4j[3].

The aim of the reload4j project is to provide a migration path[4] to those users wishing to correct log4j 1.x security issues.[5] For many companies this is a requirement by the FTC.[6] Upgrading to a newer version of log4j 1.x is not possible since the project has been declared EOL[7] by the Apache Software Foundation. This decision was reaffirmed in 2022[8] and could not be rescinded despite the best efforts of several volunteers.[9][10][11] Moreover, log4j 2.x has a considerably different API and configuration style. While some users see the benefit, the pertinence of reload4j and the necessity of a fork is subject of debate.[12] Nevertheless, more and more projects are migrating[13][14] from log4j 1.x to reload4j.

Fixed vulnerabilities

Reload4j fixes Log4Shell (CVE-2021-44228), a zero-day remote code execution vulnerability in Log4J. Additionally, it fixes XML entity injection attacks, and several more vulnerabilities listed at Common Vulnerabilities and Exposures (CVE):

  • CVE-2021-4104[15]
  • CVE-2019-17571[16]
  • CVE-2022-23302 (SQL injection vulnerability in JDBCAppender)
  • CVE-2020-9493 aka CVE-2022-23307
  • CVE-2020-9488

First release and features

Version 1.2.18.0 of reload4j was released on January the 12th, 2022 and is available for public consumption.[17]

Reload4j 1.2.18 does not add any new features with respect to log4j 1.2.17 although future versions are likely to provide backward compatible performance improvements.

slf4j-reload4j module

Subsequent to the first release of reload4j, the SLF4J project has released SLF4J version 1.7.33[18] with direct support for reload4j via the slf4j-reload4j module.[19]

As of version 1.7.35, SLF4J slf4j-log4j12 was replaced by slf4j-reload4j. By virtue of Maven relocation attribute, references to slf4j-log4j12 of will be automatically redirected to use slf4j-reload4j.

References

  1. ^ "reload4j". reload4j.qos.ch. Retrieved 2022-01-14.
  2. ^ "Maven – Guide to Naming Conventions". maven.apache.org. Retrieved 2022-01-14.
  3. ^ Elschner, Michaela. "log4j 1.x: reload4j for the rescue!". www.linkedin.com. Retrieved 2022-02-14.
  4. ^ "Vulnerabilities in Log4j - Continued". Field Effect Software Inc. Retrieved 2022-01-29.
  5. ^ "SLF4J". www.slf4j.org. Retrieved 2022-01-16.
  6. ^ "FTC warns companies to remediate Log4j security vulnerability". Federal Trade Commission. 2022-01-04. Retrieved 2022-01-14.
  7. ^ "Apache™ Logging Services™ Project Announces Log4j™ 1 End-Of-Life; Recommends Upgrade to Log4j 2". Apache Logging Services.
  8. ^ Ron, Grabowski (2022-01-06). "Log4j 1 End-of-Life Statement". lists.apache.org. Apache Logging Services.{{cite web}}: CS1 maint: url-status (link)
  9. ^ "Looking for a champion: resurrect log4j 1.x".{{cite web}}: CS1 maint: url-status (link)
  10. ^ "[DISCUSS][VOTE] Future of Log4j 1.x". lists.apache.org. Retrieved 2022-01-14.{{cite web}}: CS1 maint: url-status (link)
  11. ^ "standardizing the Maven build". lists.apache.org. Retrieved 2022-01-14.{{cite web}}: CS1 maint: url-status (link)
  12. ^ hugith (2022-01-17). "Reload4j. A drop-in replacement for log4j 1.2.17 (with the security issues fixed)". r/java. Retrieved 2022-01-17.
  13. ^ MyBatis, project. "MyBatis Bump reload4j from 1.2.18.3 to 1.2.18.4".
  14. ^ "Changes in Axon.ivy 8.0.24".
  15. ^ CVE.report; CVE. "CVE-2021-4104". CVE.report. Retrieved 2022-01-14.
  16. ^ CVE.report; CVE. "CVE-2019-17571". CVE.report. Retrieved 2022-01-14.
  17. ^ "Central Repository: ch/qos/reload4j/reload4j". repo.maven.apache.org. Retrieved 2022-01-14.
  18. ^ SLF4J.ORG (2022-01-13). "Release of version 1.7.33". SLF4J. SLF4J.ORG.{{cite web}}: CS1 maint: numeric names: authors list (link)
  19. ^ "Reload4jLoggerAdapter (SLF4J 2.0.0-alpha6 API)". www.slf4j.org. Retrieved 2022-01-14.
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