QID 352861

Date Published: 2021-11-15

QID 352861: Amazon Linux Security Advisory for c-ares: ALAS-2021-1545

A flaw was found in c-ares library, where a missing input validation check of host names returned by dns (domain name servers) can lead to output of wrong hostnames which might potentially lead to domain hijacking.
The highest threat from this vulnerability is to confidentiality and integrity as well as system availability. (
( CVE-2021-3672)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as High - 7.3 severity.
  • CVSS V2 rated as High - 7.5 severity.
  • Solution
    Please refer to Amazon advisory: ALAS-2021-1545 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352861

    Software Advisories
    Advisory ID Software Component Link
    ALAS-2021-1545 Amazon Linux URL Logo alas.aws.amazon.com/ALAS-2021-1545.html