ID

VAR-202101-0218

CVE

CVE-2020-25682

TITLE

Dnsmasq is vulnerable to memory corruption and cache poisoning

DESCRIPTION

A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. Dnsmasq is vulnerable to a set of memory corruption issues handling DNSSEC data and a second set of issues validating DNS responses. These vulnerabilities could allow an attacker to corrupt memory on a vulnerable system and perform cache poisoning attacks against a vulnerable environment.CVE-2020-25681 Not Affected CVE-2020-25682 Not Affected CVE-2020-25683 Not Affected CVE-2020-25684 Affected CVE-2020-25685 Affected CVE-2020-25686 Affected CVE-2020-25687 Not AffectedCVE-2020-25681 Not Affected CVE-2020-25682 Not Affected CVE-2020-25683 Not Affected CVE-2020-25684 Affected CVE-2020-25685 Affected CVE-2020-25686 Affected CVE-2020-25687 Not Affected. dnsmasq Is vulnerable to an out-of-bounds write.Information is obtained, information is tampered with, and service is disrupted (DoS) It may be put into a state. Dnsmasq is a lightweight DNS forwarding and DHCP and TFTP server written in C language. No detailed vulnerability details are currently provided. For the stable distribution (buster), these problems have been fixed in version 2.80-1+deb10u1. We recommend that you upgrade your dnsmasq packages. For the detailed security status of dnsmasq please refer to its security tracker page at: https://security-tracker.debian.org/tracker/dnsmasq Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEAqSkbVtrXP4xJMh3EL6Jg/PVnWQFAmAZVA4ACgkQEL6Jg/PV nWQYKAgAgVwonRAgXSliaFh0n44OPOz9wf4KibG7otcnAx4V4XqFAeXsHd/hIX/K IC313F3I+8WzvjKBhvt2KnGG9SnoTnq4roBIa1nz//vNX0hyfDm5xPlxQOExzC+c YS8kGt++SvC2wgOsrZEjyk0ecKqDJmZSwW31zXG9/2kTzCbKjuDp+i4TTADqabPC AgbmEGVKBR2Fk7K9Prct27oWoj7LHMaH+Ttb8uQGnG7OgJs9KyRI+2qIu+VaRCGf yfRj+XayPYHV1Amf5dLIKcLMMp/FnkNFoO2YIAZkWVPjXD2uPKUykJJ1GRl8R+0q qtNhPTNNuD6WnYzC8yP0KIQ2tsbg9Q== =j5Ka -----END PGP SIGNATURE----- . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: OpenShift Container Platform 4.4.33 bug fix and security update Advisory ID: RHSA-2021:0281-01 Product: Red Hat OpenShift Enterprise Advisory URL: https://access.redhat.com/errata/RHSA-2021:0281 Issue date: 2021-02-03 CVE Names: CVE-2020-2304 CVE-2020-2305 CVE-2020-8559 CVE-2020-8564 CVE-2020-14382 CVE-2020-25681 CVE-2020-25682 CVE-2020-25683 CVE-2020-25684 CVE-2020-25685 CVE-2020-25686 CVE-2020-25687 CVE-2020-25694 CVE-2020-25696 CVE-2021-20182 ===================================================================== 1. Summary: Red Hat OpenShift Container Platform release 4.4.33 is now available with updates to packages and images that fix several bugs and add enhancements. This release also includes a security update for Red Hat OpenShift Container Platform 4.4. 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. Description: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. Security Fix(es): * openshift: builder allows read and write of block devices (CVE-2021-20182) * kubernetes: Compromised node could escalate to cluster level privileges (CVE-2020-8559) * kubernetes: Docker config secrets leaked when file is malformed and loglevel >= 4 (CVE-2020-8564) 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. This advisory contains the container images for Red Hat OpenShift Container Platform 4.4.33. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHSA-2021:0282 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.openshift.com/container-platform/4.4/release_notes/ocp-4-4-rel ease-notes.html This update fixes the following bugs among others: * Previously, there were broken connections to the API server that caused nodes to remain in the NotReady state. Detecting a broken network connection could take up to 15 minutes, during which the platform would remain unavailable. This is now fixed by setting the TCP_USER_TIMEOUT socket option, which controls how long transmitted data can be unacknowledged before the connection is forcefully closed. (BZ#1907939) * Previously, the quota controllers only worked on resources retrieved from the discovery endpoint, which might contain only a fraction of all resources due to a network error. This is now fixed by having the quota controllers periodically resync when new resources are observed from the discovery endpoint. (BZ#1910096) * Previously, the kuryr-controller was comparing security groups related to network policies incorrectly. This caused security rules related to a network policy to be recreated on every minor update of that network policy. This bug has been fixed, allowing network policy updates that already have existing rules to be preserved; network policy additions or deletions are performed, if needed. (BZ#1910221) You may download the oc tool and use it to inspect release image metadata as follows: (For x86_64 architecture) $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-x86_64 The image digest is sha256:a035dddd8a5e5c99484138951ef4aba021799b77eb9046f683a5466c23717738 (For s390x architecture) $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-s390x The image digest is sha256:ecc1e5aaf8496dd60a7703562fd6c65541172a56ae9008fce6db5d55e43371dc (For ppc64le architecture) $ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-ppc64le The image digest is sha256:567bf8031c80b08e3e56a57e1c8e5b0b01a2f922e01b36ee333f6ab5bff95495 All OpenShift Container Platform 4.4 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/4.4/updating/updating-cluster - -between-minor.html#understanding-upgrade-channels_updating-cluster-between - -minor. 3. Solution: For OpenShift Container Platform 4.4 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/4.4/release_notes/ocp-4-4-rel ease-notes.html Details on how to access this content are available at https://docs.openshift.com/container-platform/4.4/updating/updating-cluster - -cli.html. 4. Bugs fixed (https://bugzilla.redhat.com/): 1848516 - [4.4] Unresponsive OpenShift 4.4 cluster on Azure (UPI) 1851422 - CVE-2020-8559 kubernetes: compromised node could escalate to cluster level privileges 1886637 - CVE-2020-8564 kubernetes: Docker config secrets leaked when file is malformed and loglevel >= 4 1895332 - NP CRD unable to be patched because of missing sg rule ID 1897546 - Backup taken on one master cannot be restored on other masters 1900727 - Using shareProcessNamespace with default pod image leaves unreaped processes 1904413 - (release 4.4) Hostsubnet gatherer produces wrong output 1905891 - genericapiserver library must wait for server.Shutdown 1906484 - Etcd container leaves grep and lsof zombie processes 1907939 - Nodes goes into NotReady state (VMware) 1910096 - [release-4.4] The quota controllers should resync on new resources and make progress 1910221 - kuryr tempest plugin test test_ipblock_network_policy_sg_rules fails 1915110 - CVE-2021-20182 openshift: builder allows read and write of block devices 1916952 - OperatorExited, Pending marketplace-operator-... pod for several weeks 1917416 - e2e: should be able to pull image from docker hub is failing permanently 1918609 - ARO/Azure: excessive pod memory allocation causes node lockup 1918974 - [sig-devex][Feature:ImageEcosystem][Slow] openshift images should be SCL enabled returning s2i usage when running the image 5. References: https://access.redhat.com/security/cve/CVE-2020-2304 https://access.redhat.com/security/cve/CVE-2020-2305 https://access.redhat.com/security/cve/CVE-2020-8559 https://access.redhat.com/security/cve/CVE-2020-8564 https://access.redhat.com/security/cve/CVE-2020-14382 https://access.redhat.com/security/cve/CVE-2020-25681 https://access.redhat.com/security/cve/CVE-2020-25682 https://access.redhat.com/security/cve/CVE-2020-25683 https://access.redhat.com/security/cve/CVE-2020-25684 https://access.redhat.com/security/cve/CVE-2020-25685 https://access.redhat.com/security/cve/CVE-2020-25686 https://access.redhat.com/security/cve/CVE-2020-25687 https://access.redhat.com/security/cve/CVE-2020-25694 https://access.redhat.com/security/cve/CVE-2020-25696 https://access.redhat.com/security/cve/CVE-2021-20182 https://access.redhat.com/security/updates/classification/#important 6. 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 iQIVAwUBYBp6w9zjgjWX9erEAQg0JhAAhv2R8jAKUz7A/RTezDOJQiDcQ1do+jV2 PD59ab0pCrWCA70gAh7mdZnaniKQGeBL1qh/lOYV0GPOpsGZjTG9ylVOg2TOEnjD /WMOnHMehWoyZR6Ys0SNQFkdf0bkvLE33r5qEcd+l/cElaqxSH4b1gG2jU9FUOK8 fAG9tmWvfbSXgGcpND5guS/jVuL8dQOyC1ktQnXdfkMvZLDOlwBotGbxTi/adzUS 6YzikRCBzoZMZC13+ZtiznfIQeq8lKlZ3+0O2lXi5KTiSqby7HmIrawUwtiHUnzJ 9VUs8zIcA/ynr3h5POhvpg0XgioUsjJ+2U0r8EP+rYtJ4lcrT68vhAzkCysMg/y4 znQ+y5M4uoxXycB92kFrMA1og8jfJCuh5y50duo9OhOe2D75Em0XnhwGoEJrDe3z jefvSwBb9WNG+jagrX69aaBrq36qhfutaI0SU7FNhoHL4Ev50zByBXSFJzQR3b59 fh0YdzC1VTCE/LKBhELpuW7VOk4MDEs5AQAiIXv3QxKKmnyLJwnQUMwSdZiQef2X z5p8crPmGEwdZ10cDgmFH7mOb2F2utFy1FzuDh+h5lXhAmCfgggiHp5fADd43h47 EAtIwmu3VurOIkvMaqQTwL5SjVAajd26KVAa09Pb6TdWAhN/jFFRvjKJMm7523Mo mafFnOJZH7k= =9sMW -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . Relevant releases/architectures: Red Hat Enterprise Linux AppStream EUS (v. 8.1) - aarch64, ppc64le, s390x, x86_64 3. Security Fix(es): * dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled (CVE-2020-25681) * dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled (CVE-2020-25682) * dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled (CVE-2020-25683) * dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25684) * dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker (CVE-2020-25685) * dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker (CVE-2020-25686) * dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled (CVE-2020-25687) 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. 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/): 1881875 - CVE-2020-25681 dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled 1882014 - CVE-2020-25682 dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled 1882018 - CVE-2020-25683 dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled 1889686 - CVE-2020-25684 dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker 1889688 - CVE-2020-25685 dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker 1890125 - CVE-2020-25686 dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker 1891568 - CVE-2020-25687 dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled 6. Package List: Red Hat Enterprise Linux AppStream EUS (v. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202101-17 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Dnsmasq: Multiple vulnerabilities Date: January 22, 2021 Bugs: #766126 ID: 202101-17 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities have been found in Dnsmasq, the worst of which may allow remote attackers to execute arbitrary code. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/dnsmasq < 2.83 >= 2.83 Description =========== Multiple vulnerabilities have been discovered in Dnsmasq. Workaround ========== There is no known workaround at this time. Resolution ========== All Dnsmasq users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.83" References ========== [ 1 ] CVE-2020-25681 https://nvd.nist.gov/vuln/detail/CVE-2020-25681 [ 2 ] CVE-2020-25682 https://nvd.nist.gov/vuln/detail/CVE-2020-25682 [ 3 ] CVE-2020-25683 https://nvd.nist.gov/vuln/detail/CVE-2020-25683 [ 4 ] CVE-2020-25684 https://nvd.nist.gov/vuln/detail/CVE-2020-25684 [ 5 ] CVE-2020-25685 https://nvd.nist.gov/vuln/detail/CVE-2020-25685 [ 6 ] CVE-2020-25686 https://nvd.nist.gov/vuln/detail/CVE-2020-25686 [ 7 ] CVE-2020-25687 https://nvd.nist.gov/vuln/detail/CVE-2020-25687 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202101-17 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 2021 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

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

buffer error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

This document was written by Vijay Sarvepalli.Statement Date:   January 04, 2021

SOURCES

LAST UPDATE DATE

2026-08-28T20:57:12.319000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE