ID

VAR-202105-1325

CVE

CVE-2021-25217

TITLE

ISC DHCP  buffer overflow vulnerability in

DESCRIPTION

In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted. ISC (Internet Systems Consortium) Provided by ISC DHCP contains a buffer overflow vulnerability. ISC DHCP contains a buffer overflow vulnerability due to a discrepancy between the processing of optional information encapsulated within network packets and information stored on disk. There is a discrepancy between the code that handles encapsulated option information in leases transmitted "on the wire" and the code which reads and parses lease information after it has been written to disk storage. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability. (CVE-2021-25217). Bugs fixed (https://bugzilla.redhat.com/): 1918750 - CVE-2021-3114 golang: crypto/elliptic: incorrect operations on the P-224 curve 1945703 - "Guest OS Info" availability in VMI describe is flaky 1958816 - [2.6.z] KubeMacPool fails to start due to OOM likely caused by a high number of Pods running in the cluster 1963275 - migration controller null pointer dereference 1965099 - Live Migration double handoff to virt-handler causes connection failures 1965181 - CDI importer doesn't report AwaitingVDDK like it used to 1967086 - Cloning DataVolumes between namespaces fails while creating cdi-upload pod 1967887 - [2.6.6] nmstate is not progressing on a node and not configuring vlan filtering that causes an outage for VMs 1969756 - Windows VMs fail to start on air-gapped environments 1970372 - Virt-handler fails to verify container-disk 1973227 - segfault in virt-controller during pdb deletion 1974084 - 2.6.6 containers 1975212 - No Virtual Machine Templates Found [EDIT - all templates are marked as depracted] 1975727 - [Regression][VMIO][Warm] The third precopy does not end in warm migration 1977756 - [2.6.z] PVC keeps in pending when using hostpath-provisioner 1982760 - [v2v] no kind VirtualMachine is registered for version \"kubevirt.io/v1\" i... 1986989 - OpenShift Virtualization 2.6.z cannot be upgraded to 4.8.0 initially deployed starting with <= 4.8 5. These packages include redhat-release-virtualization-host. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. Description: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. All OpenShift Container Platform 4.7 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift Console or the CLI oc command. Instructions for upgrading a cluster are available at https://docs.openshift.com/container-platform/4.7/updating/updating-cluster - -between-minor.html#understanding-upgrade-channels_updating-cluster-between - -minor 4. Solution: For OpenShift Container Platform 4.7 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.7/release_notes/ocp-4-7-rel ease-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.7/updating/updating-cluster - -cli.html 5. ========================================================================== Ubuntu Security Notice USN-4969-1 May 27, 2021 isc-dhcp vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: DHCP could be made to crash if it received specially crafted network traffic. Software Description: - isc-dhcp: DHCP server and client Details: Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly handled lease file parsing. A remote attacker could possibly use this issue to cause DHCP to crash, resulting in a denial of service. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: isc-dhcp-client 4.4.1-2.2ubuntu6.1 isc-dhcp-server 4.4.1-2.2ubuntu6.1 Ubuntu 20.10: isc-dhcp-client 4.4.1-2.1ubuntu10.1 isc-dhcp-server 4.4.1-2.1ubuntu10.1 Ubuntu 20.04 LTS: isc-dhcp-client 4.4.1-2.1ubuntu5.20.04.2 isc-dhcp-server 4.4.1-2.1ubuntu5.20.04.2 Ubuntu 18.04 LTS: isc-dhcp-client 4.3.5-3ubuntu7.3 isc-dhcp-server 4.3.5-3ubuntu7.3 In general, a standard system update will make all the necessary changes. 7.7) - ppc64, ppc64le, s390x, x86_64 3. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: dhcp security update Advisory ID: RHSA-2021:2357-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:2357 Issue date: 2021-06-09 CVE Names: CVE-2021-25217 ==================================================================== 1. Summary: An update for dhcp is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network. Security Fix(es): * dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient (CVE-2021-25217) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1963258 - CVE-2021-25217 dhcp: stack-based buffer overflow when parsing statements with colon-separated hex digits in config or lease files in dhcpd and dhclient 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: dhcp-4.2.5-83.el7_9.1.src.rpm x86_64: dhclient-4.2.5-83.el7_9.1.x86_64.rpm dhcp-common-4.2.5-83.el7_9.1.x86_64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-libs-4.2.5-83.el7_9.1.i686.rpm dhcp-libs-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: dhcp-4.2.5-83.el7_9.1.x86_64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-devel-4.2.5-83.el7_9.1.i686.rpm dhcp-devel-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: dhcp-4.2.5-83.el7_9.1.src.rpm x86_64: dhclient-4.2.5-83.el7_9.1.x86_64.rpm dhcp-common-4.2.5-83.el7_9.1.x86_64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-libs-4.2.5-83.el7_9.1.i686.rpm dhcp-libs-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: dhcp-4.2.5-83.el7_9.1.x86_64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-devel-4.2.5-83.el7_9.1.i686.rpm dhcp-devel-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: dhcp-4.2.5-83.el7_9.1.src.rpm ppc64: dhclient-4.2.5-83.el7_9.1.ppc64.rpm dhcp-4.2.5-83.el7_9.1.ppc64.rpm dhcp-common-4.2.5-83.el7_9.1.ppc64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.ppc.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.ppc64.rpm dhcp-libs-4.2.5-83.el7_9.1.ppc.rpm dhcp-libs-4.2.5-83.el7_9.1.ppc64.rpm ppc64le: dhclient-4.2.5-83.el7_9.1.ppc64le.rpm dhcp-4.2.5-83.el7_9.1.ppc64le.rpm dhcp-common-4.2.5-83.el7_9.1.ppc64le.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.ppc64le.rpm dhcp-libs-4.2.5-83.el7_9.1.ppc64le.rpm s390x: dhclient-4.2.5-83.el7_9.1.s390x.rpm dhcp-4.2.5-83.el7_9.1.s390x.rpm dhcp-common-4.2.5-83.el7_9.1.s390x.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.s390.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.s390x.rpm dhcp-libs-4.2.5-83.el7_9.1.s390.rpm dhcp-libs-4.2.5-83.el7_9.1.s390x.rpm x86_64: dhclient-4.2.5-83.el7_9.1.x86_64.rpm dhcp-4.2.5-83.el7_9.1.x86_64.rpm dhcp-common-4.2.5-83.el7_9.1.x86_64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-libs-4.2.5-83.el7_9.1.i686.rpm dhcp-libs-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: dhcp-debuginfo-4.2.5-83.el7_9.1.ppc.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.ppc64.rpm dhcp-devel-4.2.5-83.el7_9.1.ppc.rpm dhcp-devel-4.2.5-83.el7_9.1.ppc64.rpm ppc64le: dhcp-debuginfo-4.2.5-83.el7_9.1.ppc64le.rpm dhcp-devel-4.2.5-83.el7_9.1.ppc64le.rpm s390x: dhcp-debuginfo-4.2.5-83.el7_9.1.s390.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.s390x.rpm dhcp-devel-4.2.5-83.el7_9.1.s390.rpm dhcp-devel-4.2.5-83.el7_9.1.s390x.rpm x86_64: dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-devel-4.2.5-83.el7_9.1.i686.rpm dhcp-devel-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: dhcp-4.2.5-83.el7_9.1.src.rpm x86_64: dhclient-4.2.5-83.el7_9.1.x86_64.rpm dhcp-4.2.5-83.el7_9.1.x86_64.rpm dhcp-common-4.2.5-83.el7_9.1.x86_64.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-libs-4.2.5-83.el7_9.1.i686.rpm dhcp-libs-4.2.5-83.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: dhcp-debuginfo-4.2.5-83.el7_9.1.i686.rpm dhcp-debuginfo-4.2.5-83.el7_9.1.x86_64.rpm dhcp-devel-4.2.5-83.el7_9.1.i686.rpm dhcp-devel-4.2.5-83.el7_9.1.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2021-25217 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYMCeytzjgjWX9erEAQgPYw/+K6NTT5tvNy0WHRy46UioFuzIbxlMOPzm zXmk61B2Dgod7DCU3EbF9u7nSViaQds11pDCrTejH70WrqNQSaWMhsASgtNmQ42q 0oVWQwqyB8mP/73BwYJQ84eZDGwsyqQf/9MO96g4c0jlZOAu9vSxvSflQ4DY8m9L 0+pk3/zHOsUz3Za7Ns/1wa8pmq3hxAt0z6Z6ri0Ka8CEHg7W7ELGC67ih1BOcpP5 mdWOSfTW+F1EzmerDW0eom09R/Ndfo/FdGeCbEq1K6kvcrPy4e/tsyBCquPYPFar aTADxJPMObDTY0dJhqw1qZ5cERLnhJaj8GzWc0Ne2KIAFig/NcVhEZL8RtvrNWhO JIaVZ7zK6bi1VASVVIAP8yQzwdZFEbfMREOa705gMvXMz1Ux08YvsbrelD/LeJXe 45C2+zGvM7KDd/AlrhopZPbBJI07tbNe8qWzFggJtBTMVg28i5K7DjFjvASFZFrV 8nKdWae1GOEtH23fygGOoW4m0KkGWd1Tc/lte6Wy788KOa/yF3IQkWeTSo5KG33Q UHCzx6NzHyeAgW7K9QvvpIjfbxIAyBbebsIkhOhySjfsAp28lKkaZZRVF/sNWIvG GRibEMi366KUTR5AiTMAjHoYgIDzp7nywWiYBhf9SuNgqV3kG0Yz7fd1ac0+qcH5 zPKanVJNoQs=9+pl -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . 8) - aarch64, noarch, ppc64le, s390x, x86_64 3

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote or local

TYPE

overflow

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2025-03-02T20:25:06.113000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE