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Red Hat: CVE-2021-23017: CVE-2021-23017 nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (Multiple Advisories)

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Red Hat: CVE-2021-23017: CVE-2021-23017 nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (Multiple Advisories)

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
06/01/2021
Created
06/09/2021
Added
06/08/2021
Modified
12/15/2023

Description

A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.

Solution(s)

  • redhat-upgrade-nginx
  • redhat-upgrade-nginx-all-modules
  • redhat-upgrade-nginx-debuginfo
  • redhat-upgrade-nginx-debugsource
  • redhat-upgrade-nginx-filesystem
  • redhat-upgrade-nginx-mod-http-image-filter
  • redhat-upgrade-nginx-mod-http-image-filter-debuginfo
  • redhat-upgrade-nginx-mod-http-perl
  • redhat-upgrade-nginx-mod-http-perl-debuginfo
  • redhat-upgrade-nginx-mod-http-xslt-filter
  • redhat-upgrade-nginx-mod-http-xslt-filter-debuginfo
  • redhat-upgrade-nginx-mod-mail
  • redhat-upgrade-nginx-mod-mail-debuginfo
  • redhat-upgrade-nginx-mod-stream
  • redhat-upgrade-nginx-mod-stream-debuginfo

References

  • CVE-2021-23017
  • RHSA-2021:2259
  • RHSA-2021:2290
  • RHSA-2022:0323

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