QID 376195

Date Published: 2021-12-19

QID 376195: Apache Log4j Denial of Service (DOS) Vulnerability (Log4Shell) Detected Based on Qualys Log4j scan Utility

Apache Log4j2 does not always protect from infinite recursion in lookup evaluation (CVE-2021-45105), this was made public on December 18, 2021

Affected versions:
Log4j versions 2.x prior to and including 2.16

QID Detection: (Authenticated)
Operating System: Windows
This QID reads the file generated by Qualys utility Qualys Log4j Scan Utility for Windows
The QID reads 1st 100000 characters from the generated out put file.

QID Detection: (Authenticated)
Operating System: Linux
This QID reads the file generated by Qualys utility Qualys Log4j Scan Utility for Linux to find vulnerable instances of Log4j.

Apache Log4j2 versions 2.0-alpha1 through 2.16.0 did not protect from uncontrolled recursion from self-referential lookups. When the logging configuration uses a non-default Pattern Layout with a Context Lookup (for example, $${ctx:loginId}), attackers with control over Thread Context Map (MDC) input data can craft malicious input data that contains a recursive lookup, resulting in a StackOverflowError that will terminate the process. This is also known as a DOS (Denial of Service) attack.

  • CVSS V3 rated as Medium - 5.9 severity.
  • CVSS V2 rated as Medium - 4.3 severity.
    • Solution
    Apache recommends customers to upgrade to Log4j 2.3.1 (for Java 6), 2.12.3 (for Java 7), or 2.17.0 (for Java 8 and later). If updating the version is not possible, please refer to the mitigations mentioned here Log4j.
    Vendor References

    CVEs related to QID 376195

    CVE-2021-45105 |
    Software Advisories
    Advisory ID Software Component Link
    NA URL Logo logging.apache.org/log4j/2.x/download.html
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