QID 352820

Date Published: 2021-09-15

QID 352820: Amazon Linux Security Advisory for nginx: AL2012-2021-344

Package updates are available for amazon linux that fix the following vulnerabilities:
cve-2021-23017: 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.
1963121: cve-2021-23017 nginx: off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name


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
    Administrators are advised to apply the appropriate software updates.
    Vendor References

    CVEs related to QID 352820

    CVE-2021-23017 |
    Software Advisories
    Advisory ID Software Component Link
    AL2012-2021-344 Amazon Linux Bare Metal URL Logo docs.aws.amazon.com/AWSEC2/latest/UserGuide/install-updates.html
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