Security Advisories

CLAV-SA-0297 High Severity vulnerability in Apache Log4J 2

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Advisory ID CLAV-SA-0297
Summary High Severity vulnerability in Apache Log4J 2
Updated 2022-01-11
First Published 2021-12-13
Impact   Critical
CVSS URL https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Score 10.0
CVEs
Affected Products
  • EasyAccess
  • InCenter
  • Non-Clavister Products

 

Introduction

Log4j 2 is used in Clavisters EasyAccess, EasyPassword and InCenter products and must be reconfigured/patched to not be susceptible to these vulnerabilities.

CVE-2021-44228 - Log4Shell

Log4j’s JNDI support has not restricted what names could be resolved. Some protocols are unsafe or can allow remote code execution.

For detailed information please see https://logging.apache.org/log4j/2.x/security.html#CVE-2021-44228

CVE-2021-45046

Apache Log4j2 Thread Context Lookup Pattern vulnerable to remote code execution in certain non-default configurations.

For detailed information please see https://logging.apache.org/log4j/2.x/security.html#CVE-2021-45046

CVE-2021-45105

Apache Log4j2 does not always protect from infinite recursion in lookup evaluation.

For detailed information please see https://logging.apache.org/log4j/2.x/security.html#CVE-2021-45105

CVE-2021-44832

Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration.

For detailed information please see https://logging.apache.org/log4j/2.x/security.html#CVE-2021-44832

Affected Versions

  • EasyAccess <= 4.1.2
  • InCenter <= 1.68.03, 2.0.0 and 2.1.0

These products are NOT affected

The following products does not use any Java components at all and are therefore (and have never been) vulnerable to these Log4j 2 vulnerabilities.

  • Clavister NetWall (cOS Core)
  • Clavister NetShield (cOS Stream)
  • Clavister InControl
  • Clavister OneConnect

Fix Information

Preventative measures

Clavister IDP can be used to mitigate these attacks on non-encrypted traffic, please see https://www.clavister.com/advisories/idp/?Query=CVE-2021-44228 for details regarding what signatures to use. See https://kb.clavister.com/343410414/protecting-against-the-apache-log4j-exploit for detailed information.

EasyAccess

For EasyAccess please refer to https://kb.clavister.com/343410234/high-severity-vulnerability-in-apache-log4j-2 for detailed information.

InCenter

For InCenter please refer to https://kb.clavister.com/343410462/vulnerability-in-apache-log4j-2-which-is-used-in-incenter for detailed information.

Security Patches

Updated versions will be available from https://www.clavister.com/ as soon as they are available.

References

 

Living document

We are continously updating this advisory as more information gets available!