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Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021

Critical Vulnerabilities in Apache Log4j Java Logging Library

On December 9, 2021, the following critical vulnerability in the Apache Log4j Java logging library affecting all Log4j2 versions earlier than 2.15.0 was disclosed:

• CVE-2021-44228: Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints

On December 14, 2021, the following critical vulnerability, which affects certain Apache Log4j use cases in versions 2.15.0 and earlier, was disclosed:

• CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack

On December 18, 2021, a vulnerability in the Apache Log4j component affecting versions 2.16 and earlier was disclosed:

• CVE-2021-45105: Apache Log4j2 does not always protect from infinite recursion in lookup evaluation

For a description of these vulnerabilities, see the Apache Log4j Security Vulnerabilities page.

Cisco's Response to These Vulnerabilities

Cisco continues to assess all products and services for impact from both CVE-2021-44228 and CVE-2021-45046. To help detect exploitation of these vulnerabilities, Cisco has released Snort rules at the following location: Talos Rules 2021-12-21

Product fixes that are listed in this advisory will address both CVE-2021-44228 and CVE-2021-45046 unless otherwise noted.

Cisco is reviewing CVE-2021-45105 to determine what impact it may have on Cisco products and cloud offerings and will provide upgrades for affected products.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd

     
         
Security Impact Rating:  Critical
   
   
       
CVE: CVE-2021-44228,CVE-2021-45046
Source: Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021 (https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd?vs_f=Cisco%20Security%20Advisory&vs_cat=Security%20Intelligence&vs_type=RSS&vs_p=Vulnerabilities%20in%20Apache%20Log4j%20Library%20Affecting%20Cisco%20Products:%20December%202021&vs_k=1)