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nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name

🗓️ 08 Jun 2021 10:52:04Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 8 Views

Nginx DNS resolver off-by-one error can write out of bounds in heap, risking remote code execution.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.1aarch64nginx1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1nginx-1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1.aarch64.rpm
Red Hat Enterprise Linux8.1ppc64lenginx1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1nginx-1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1.ppc64le.rpm
Red Hat Enterprise Linux8.1s390xnginx1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1nginx-1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1.s390x.rpm
Red Hat Enterprise Linux8.1x86_64nginx1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1nginx-1:1.16.1-1.module+el8.1.0+11153+6c3a40a9.1.x86_64.rpm
Red Hat Enterprise Linux8.2aarch64nginx1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1nginx-1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1.aarch64.rpm
Red Hat Enterprise Linux8.2ppc64lenginx1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1nginx-1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xnginx1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1nginx-1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1.s390x.rpm
Red Hat Enterprise Linux8.2x86_64nginx1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1nginx-1:1.16.1-1.module+el8.2.0+11154+636e4c3b.1.x86_64.rpm
Red Hat Enterprise Linux8.4aarch64nginx1:1.16.1-2.module+el8.4.0+11155+68135136.1nginx-1:1.16.1-2.module+el8.4.0+11155+68135136.1.aarch64.rpm
Red Hat Enterprise Linux8.4ppc64lenginx1:1.16.1-2.module+el8.4.0+11155+68135136.1nginx-1:1.16.1-2.module+el8.4.0+11155+68135136.1.ppc64le.rpm
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28 Jun 2026 08:47Current
8High risk
Vulners AI Score8
CVSS 26.8
CVSS 3.17.7
EPSS0.53461
8