QID 352378

Date Published: 2021-06-09

QID 352378: Amazon Linux Security Advisory for nginx: ALAS-2021-1507

<DIV ID="issue_overview"> a flaw was found in nginx.
An off-by-one error while processing dns responses allows a network attacker to write a dot character out of bounds in a heap allocated buffer which can allow overwriting the least significant byte of next heap chunk metadata likely leading to a remote code execution in certain circumstances.
The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (
cve-2021-23017 ) </DIV>

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 Critical - 9.8 severity.
  • CVSS V2 rated as High - 7.5 severity.
    • Solution
    Please refer to Amazon advisory: ALAS-2021-1507 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352378

    CVE-2021-23017 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2021-1507 Amazon Linux URL Logo alas.aws.amazon.com/ALAS-2021-1507.html
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