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dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient

🗓️ 14 Jun 2021 21:01:53Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

DHCP stack-based overflow occurs in colon hex option parsing from leases or config due to on-wire and storage data mismatch.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.2aarch64dhcp-client12:4.3.6-40.el8_2.2dhcp-client-12:4.3.6-40.el8_2.2.aarch64.rpm
Red Hat Enterprise Linux8.2ppc64ledhcp-client12:4.3.6-40.el8_2.2dhcp-client-12:4.3.6-40.el8_2.2.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xdhcp-client12:4.3.6-40.el8_2.2dhcp-client-12:4.3.6-40.el8_2.2.s390x.rpm
Red Hat Enterprise Linux8.2x86_64dhcp-client12:4.3.6-40.el8_2.2dhcp-client-12:4.3.6-40.el8_2.2.x86_64.rpm
Red Hat Enterprise Linux8.2aarch64dhcp-client-debuginfo12:4.3.6-40.el8_2.2dhcp-client-debuginfo-12:4.3.6-40.el8_2.2.aarch64.rpm
Red Hat Enterprise Linux8.2ppc64ledhcp-client-debuginfo12:4.3.6-40.el8_2.2dhcp-client-debuginfo-12:4.3.6-40.el8_2.2.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xdhcp-client-debuginfo12:4.3.6-40.el8_2.2dhcp-client-debuginfo-12:4.3.6-40.el8_2.2.s390x.rpm
Red Hat Enterprise Linux8.2x86_64dhcp-client-debuginfo12:4.3.6-40.el8_2.2dhcp-client-debuginfo-12:4.3.6-40.el8_2.2.x86_64.rpm
Red Hat Enterprise Linux8.2anydhcp-client-debuginfo12:4.3.6-40.el8_2.2.i686dhcp-client-debuginfo-12:4.3.6-40.el8_2.2.i686.noarch.rpm
Red Hat Enterprise Linux8.2anydhcp-common12:4.3.6-40.el8_2.2.noarchdhcp-common-12:4.3.6-40.el8_2.2.noarch.noarch.rpm
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28 Jun 2026 12:15Current
6.1Medium risk
Vulners AI Score6.1
CVSS 23.3
CVSS 3.17.4
EPSS0.06118
4