ID

VAR-202105-1325

CVE

CVE-2021-25217

TITLE

Red Hat Security Advisory 2021-2469-01

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. 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). -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: dhcp security update Advisory ID: RHSA-2021:2469-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:2469 Issue date: 2021-06-17 CVE Names: CVE-2021-25217 ===================================================================== 1. Summary: An update for dhcp is now available for Red Hat Enterprise Linux 7.6 Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended Update Support, and Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions. 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 Server AUS (v. 7.6) - x86_64 Red Hat Enterprise Linux Server E4S (v. 7.6) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.6) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.6) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.6) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.6) - 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 Server AUS (v. 7.6): Source: dhcp-4.2.5-69.el7_6.1.src.rpm x86_64: dhclient-4.2.5-69.el7_6.1.x86_64.rpm dhcp-4.2.5-69.el7_6.1.x86_64.rpm dhcp-common-4.2.5-69.el7_6.1.x86_64.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm dhcp-libs-4.2.5-69.el7_6.1.i686.rpm dhcp-libs-4.2.5-69.el7_6.1.x86_64.rpm Red Hat Enterprise Linux Server E4S (v. 7.6): Source: dhcp-4.2.5-69.el7_6.1.src.rpm ppc64le: dhclient-4.2.5-69.el7_6.1.ppc64le.rpm dhcp-4.2.5-69.el7_6.1.ppc64le.rpm dhcp-common-4.2.5-69.el7_6.1.ppc64le.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.ppc64le.rpm dhcp-libs-4.2.5-69.el7_6.1.ppc64le.rpm x86_64: dhclient-4.2.5-69.el7_6.1.x86_64.rpm dhcp-4.2.5-69.el7_6.1.x86_64.rpm dhcp-common-4.2.5-69.el7_6.1.x86_64.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm dhcp-libs-4.2.5-69.el7_6.1.i686.rpm dhcp-libs-4.2.5-69.el7_6.1.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 7.6): Source: dhcp-4.2.5-69.el7_6.1.src.rpm x86_64: dhclient-4.2.5-69.el7_6.1.x86_64.rpm dhcp-4.2.5-69.el7_6.1.x86_64.rpm dhcp-common-4.2.5-69.el7_6.1.x86_64.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm dhcp-libs-4.2.5-69.el7_6.1.i686.rpm dhcp-libs-4.2.5-69.el7_6.1.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.6): x86_64: dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm dhcp-devel-4.2.5-69.el7_6.1.i686.rpm dhcp-devel-4.2.5-69.el7_6.1.x86_64.rpm Red Hat Enterprise Linux Server Optional E4S (v. 7.6): ppc64le: dhcp-debuginfo-4.2.5-69.el7_6.1.ppc64le.rpm dhcp-devel-4.2.5-69.el7_6.1.ppc64le.rpm x86_64: dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm dhcp-devel-4.2.5-69.el7_6.1.i686.rpm dhcp-devel-4.2.5-69.el7_6.1.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 7.6): x86_64: dhcp-debuginfo-4.2.5-69.el7_6.1.i686.rpm dhcp-debuginfo-4.2.5-69.el7_6.1.x86_64.rpm dhcp-devel-4.2.5-69.el7_6.1.i686.rpm dhcp-devel-4.2.5-69.el7_6.1.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 iQIVAwUBYMs0KtzjgjWX9erEAQis7xAAhh3MBohMBq6bZd6sPasNG4rPX+Xh5AWf D+6WNTQLV1u1IU4ZzGKVMtBNSfCd8m727z/L0d4wBof06ngUXHkdR4AEzn5uuWSz lHzlgbpmvqxeBnXrHOG1WE43JNXHSsj0u8eARsLxEU4/rxnbLVOj5dMJkdWmXN61 DocHHFVw6GmdZSCr6/tLjvG57fWtVLQF4SpEdhXz55iNZ1l6y09FDtoom/FuXIcG VnsUpsu/iWMFaUaVQH3sFVLksl39IrHFQxvskXR+FHAPzb8vVuKyNihJ5b3BUhfh jTUKPxLO+X0/K9+cNFVSuSTPr7eHpRRHdUbFIHcUB0s1ACOnmvHr6G8FaVAi9BQZ 6hzWcOFOZS7fF4TnXF3q0yDAKApRwlyF1PP21u1XdCb17Z4+E2LZF0nqnbb3hCxV JfnsadNc2Re/gc3u1bOGQb56ylc7LC74BeMDoJSeldqdPeT5JUc8XRRCyWHjVcjD Bj1kD90FbD3Z3jRAvASgKg4KU1xqEZidHyL/qHo9YTS0h9lqc2iWb0n3/4RU0E8k OuNPpWxkzt1uGQl3iJbQH4TOsIQtqoDFOaCaPMbol44fnm69Q52zRBBr6AHVhEcY iOpTa2PUFK3FLfhkfUCHcCRVXqXeewefcODTWs2Jwx6/sl7nsZpWMNlV8+rdUmXR BuvubM0bUt8= =mdD7 -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce . 6 ELS) - i386, s390x, x86_64 3. 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. 7.7) - ppc64, ppc64le, s390x, x86_64 3. 8) - aarch64, noarch, ppc64le, s390x, x86_64 3. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202305-22 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: ISC DHCP: Multiple Vulnerabilities Date: May 03, 2023 Bugs: #875521, #792324 ID: 202305-22 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities have been discovered in ISC DHCP, the worst of which could result in denial of service. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/dhcp < 4.4.3_p1 >= 4.4.3_p1 Description =========== Multiple vulnerabilities have been discovered in ISC DHCP. Please review the CVE identifiers referenced below for details. Impact ====== Please review the referenced CVE identifiers for details. Workaround ========== There is no known workaround at this time. Resolution ========== All ISC DHCP users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/dhcp-4.4.3_p1" References ========== [ 1 ] CVE-2021-25217 https://nvd.nist.gov/vuln/detail/CVE-2021-25217 [ 2 ] CVE-2022-2928 https://nvd.nist.gov/vuln/detail/CVE-2022-2928 [ 3 ] CVE-2022-2929 https://nvd.nist.gov/vuln/detail/CVE-2022-2929 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202305-22 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2023 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

TYPE

overflow

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2025-09-28T21:47:26.627000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE