ID

VAR-202101-0222

CVE

CVE-2020-25686

TITLE

Dnsmasq is vulnerable to memory corruption and cache poisoning

DESCRIPTION

A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity. 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 a lightweight DNS forwarding and DHCP and TFTP server written in C language. Dnsmasq has a security feature vulnerability. The vulnerability stems from not checking existing pending requests with the same name and forwarding a new request, allowing an attacker to perform a "birthday attack" scenario to forge a response and possibly destroy the DNS cache. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an malicious user to perform a DNS Cache Poisoning attack. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. (CVE-2020-25686). 7) - aarch64, ppc64le, s390x 3. This advisory contains the following OpenShift Virtualization 2.6.0 images: RHEL-8-CNV-2.6 =============kubevirt-cpu-node-labeller-container-v2.6.0-5 kubevirt-cpu-model-nfd-plugin-container-v2.6.0-5 node-maintenance-operator-container-v2.6.0-13 kubevirt-vmware-container-v2.6.0-5 virtio-win-container-v2.6.0-5 kubevirt-kvm-info-nfd-plugin-container-v2.6.0-5 bridge-marker-container-v2.6.0-9 kubevirt-template-validator-container-v2.6.0-9 kubevirt-v2v-conversion-container-v2.6.0-6 kubemacpool-container-v2.6.0-13 kubevirt-ssp-operator-container-v2.6.0-40 hyperconverged-cluster-webhook-container-v2.6.0-73 hyperconverged-cluster-operator-container-v2.6.0-73 ovs-cni-plugin-container-v2.6.0-10 cnv-containernetworking-plugins-container-v2.6.0-10 ovs-cni-marker-container-v2.6.0-10 cluster-network-addons-operator-container-v2.6.0-16 hostpath-provisioner-container-v2.6.0-11 hostpath-provisioner-operator-container-v2.6.0-14 vm-import-virtv2v-container-v2.6.0-21 kubernetes-nmstate-handler-container-v2.6.0-19 vm-import-controller-container-v2.6.0-21 vm-import-operator-container-v2.6.0-21 virt-api-container-v2.6.0-111 virt-controller-container-v2.6.0-111 virt-handler-container-v2.6.0-111 virt-operator-container-v2.6.0-111 virt-launcher-container-v2.6.0-111 cnv-must-gather-container-v2.6.0-54 virt-cdi-importer-container-v2.6.0-24 virt-cdi-cloner-container-v2.6.0-24 virt-cdi-controller-container-v2.6.0-24 virt-cdi-uploadserver-container-v2.6.0-24 virt-cdi-apiserver-container-v2.6.0-24 virt-cdi-uploadproxy-container-v2.6.0-24 virt-cdi-operator-container-v2.6.0-24 hco-bundle-registry-container-v2.6.0-582 Security Fix(es): * golang.org/x/crypto: Processing of crafted ssh-ed25519 public keys allows for panic (CVE-2020-9283) * golang: crypto/ssh: crafted authentication request can lead to nil pointer dereference (CVE-2020-29652) * gogo/protobuf: plugin/unmarshal/unmarshal.go lacks certain index validation (CVE-2021-3121) * golang.org/x/text: possibility to trigger an infinite loop in encoding/unicode could lead to crash (CVE-2020-14040) * golang: data race in certain net/http servers including ReverseProxy can lead to DoS (CVE-2020-15586) * golang: ReadUvarint and ReadVarint can read an unlimited number of bytes from invalid inputs (CVE-2020-16845) * jwt-go: access restriction bypass vulnerability (CVE-2020-26160) * golang-github-gorilla-websocket: integer overflow leads to denial of service (CVE-2020-27813) * golang: math/big: panic during recursive division of very large numbers (CVE-2020-28362) * containernetworking-cni: Arbitrary path injection via type field in CNI configuration (CVE-2021-20206) 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. Bugs fixed (https://bugzilla.redhat.com/): 1732329 - Virtual Machine is missing documentation of its properties in yaml editor 1783192 - Guest kernel panic when start RHEL6.10 guest with q35 machine type and virtio disk in cnv 1791753 - [RFE] [SSP] Template validator should check validations in template's parent template 1804533 - CVE-2020-9283 golang.org/x/crypto: Processing of crafted ssh-ed25519 public keys allows for panic 1848954 - KMP missing CA extensions in cabundle of mutatingwebhookconfiguration 1848956 - KMP requires downtime for CA stabilization during certificate rotation 1853652 - CVE-2020-14040 golang.org/x/text: possibility to trigger an infinite loop in encoding/unicode could lead to crash 1853911 - VM with dot in network name fails to start with unclear message 1854098 - NodeNetworkState on workers doesn't have "status" key due to nmstate-handler pod failure to run "nmstatectl show" 1856347 - SR-IOV : Missing network name for sriov during vm setup 1856953 - CVE-2020-15586 golang: data race in certain net/http servers including ReverseProxy can lead to DoS 1859235 - Common Templates - after upgrade there are 2 common templates per each os-workload-flavor combination 1860714 - No API information from `oc explain` 1860992 - CNV upgrade - users are not removed from privileged SecurityContextConstraints 1864577 - [v2v][RHV to CNV non migratable source VM fails to import to Ceph-rbd / File system due to overhead required for Filesystem 1866593 - CDI is not handling vm disk clone 1867099 - CVE-2020-16845 golang: ReadUvarint and ReadVarint can read an unlimited number of bytes from invalid inputs 1868817 - Container-native Virtualization 2.6.0 Images 1873771 - Improve the VMCreationFailed error message caused by VM low memory 1874812 - SR-IOV: Guest Agent expose link-local ipv6 address for sometime and then remove it 1878499 - DV import doesn't recover from scratch space PVC deletion 1879108 - Inconsistent naming of "oc virt" command in help text 1881874 - openshift-cnv namespace is getting stuck if the user tries to delete it while CNV is running 1883232 - Webscale: kubevirt/CNV datavolume importer pod inability to disable sidecar injection if namespace has sidecar injection enabled but VM Template does NOT 1883371 - CVE-2020-26160 jwt-go: access restriction bypass vulnerability 1885153 - [v2v][RHV to CNv VM import] Wrong Network mapping do not show a relevant error message 1885418 - [openshift-cnv] issues with memory overhead calculation when limits are used 1887398 - [openshift-cnv][CNV] nodes need to exist and be labeled first, *before* the NodeNetworkConfigurationPolicy is applied 1889295 - [v2v][VMware to CNV VM import API] diskMappings: volumeMode Block is not passed on to PVC request. 1891285 - Common templates and kubevirt-config cm - update machine-type 1891440 - [v2v][VMware to CNV VM import API]Source VM with no network interface fail with unclear error 1892227 - [SSP] cluster scoped resources are not being reconciled 1893278 - openshift-virtualization-os-images namespace not seen by user 1893646 - [HCO] Pod placement configuration - dry run is not performed for all the configuration stanza 1894428 - Message for VMI not migratable is not clear enough 1894824 - [v2v][VM import] Pick the smallest template for the imported VM, and not always Medium 1894897 - [v2v][VMIO] VMimport CR is not reported as failed when target VM is deleted during the import 1895414 - Virt-operator is accepting updates to the placement of its workload components even with running VMs 1897635 - CVE-2020-28362 golang: math/big: panic during recursive division of very large numbers 1898072 - Add Fedora33 to Fedora common templates 1898840 - [v2v] VM import VMWare to CNV Import 63 chars vm name should not fail 1899558 - CNV 2.6 - nmstate fails to set state 1901480 - VM disk io can't worked if namespace have label kubemacpool 1902046 - Not possible to edit CDIConfig (through CDI CR / CDIConfig) 1902111 - CVE-2020-27813 golang-github-gorilla-websocket: integer overflow leads to denial of service 1903014 - hco-webhook pod in CreateContainerError 1903585 - [v2v] Windows 2012 VM imported from RHV goes into Windows repair mode 1904797 - [VMIO][vmware] A migrated RHEL/Windows VM starts in emergency mode/safe mode when target storage is NFS and target namespace is NOT "default" 1906199 - [CNV-2.5] CNV Tries to Install on Windows Workers 1907151 - kubevirt version is not reported correctly via virtctl 1907352 - VM/VMI link changes to `kubevirt.io~v1~VirtualMachineInstance` on CNV 2.6 1907691 - [CNV] Configuring NodeNetworkConfigurationPolicy caused "Internal error occurred" for creating datavolume 1907988 - VM loses dynamic IP address of its default interface after migration 1908363 - Applying NodeNetworkConfigurationPolicy for different NIC than default disables br-ex bridge and nodes lose connectivity 1908421 - [v2v] [VM import RHV to CNV] Windows imported VM boot failed: INACCESSIBLE BOOT DEVICE error 1908883 - CVE-2020-29652 golang: crypto/ssh: crafted authentication request can lead to nil pointer dereference 1909458 - [V2V][VMware to CNV VM import via api using VMIO] VM import to Ceph RBD/BLOCK fails on "qemu-img: /data/disk.img" error 1910857 - Provide a mechanism to enable the HotplugVolumes feature gate via HCO 1911118 - Windows VMI LiveMigration / shutdown fails on 'XML error: non unique alias detected: ua-') 1911396 - Set networkInterfaceMultiqueue false in rhel 6 template for e1000e interface 1911662 - el6 guests don't work properly if virtio bus is specified on various devices 1912908 - Allow using "scsi" bus for disks in template validation 1913248 - Creating vlan interface on top of a bond device via NodeNetworkConfigurationPolicy fails 1913320 - Informative message needed with virtctl image-upload, that additional step is needed from the user 1913717 - Users should have read permitions for golden images data volumes 1913756 - Migrating to Ceph-RBD + Block fails when skipping zeroes 1914177 - CNV does not preallocate blank file data volumes 1914608 - Obsolete CPU models (kubevirt-cpu-plugin-configmap) are set on worker nodes 1914947 - HPP golden images - DV shoudld not be created with WaitForFirstConsumer 1917908 - [VMIO] vmimport pod fail to create when using ceph-rbd/block 1917963 - [CNV 2.6] Unable to install CNV disconnected - requires kvm-info-nfd-plugin which is not mirrored 1919391 - CVE-2021-20206 containernetworking-cni: Arbitrary path injection via type field in CNI configuration 1920576 - HCO can report ready=true when it failed to create a CR for a component operator 1920610 - e2e-aws-4.7-cnv consistently failing on Hyperconverged Cluster Operator 1921650 - CVE-2021-3121 gogo/protobuf: plugin/unmarshal/unmarshal.go lacks certain index validation 1923979 - kubernetes-nmstate: nmstate-handler pod crashes when configuring bridge device using ip tool 1927373 - NoExecute taint violates pdb; VMIs are not live migrated 1931376 - VMs disconnected from nmstate-defined bridge after CNV-2.5.4->CNV-2.6.0 upgrade 5. Relevant releases/architectures: RHEL 7-based RHEV-H for RHEV 4 (build requirements) - noarch, x86_64 Red Hat Virtualization 4 Hypervisor for RHEL 7 - noarch Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts - noarch, ppc64le, 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. Bug Fix(es): * When performing an upgrade of the Red Hat Virtualization Host using the command `yum update`, the yum repository for RHV 4.3 EUS is unreachable As a workaround, run the following command: `# yum update --releasever=7Server` (BZ#1899378) 4. 7.7) - ppc64, ppc64le, s390x, x86_64 3. ========================================================================== Ubuntu Security Notice USN-4698-1 January 19, 2021 dnsmasq vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in Dnsmasq. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled memory when sorting RRsets. A remote attacker could use this issue to cause Dnsmasq to hang, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-25681, CVE-2020-25687) Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled extracting certain names. A remote attacker could use this issue to cause Dnsmasq to hang, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-25682, CVE-2020-25683) Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly implemented address/port checks. (CVE-2020-25684) Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly implemented query resource name checks. (CVE-2020-25685) Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled multiple query requests for the same resource name. (CVE-2020-25686) It was discovered that Dnsmasq incorrectly handled memory during DHCP response creation. A remote attacker could possibly use this issue to cause Dnsmasq to consume resources, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2019-14834) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: dnsmasq 2.82-1ubuntu1.1 dnsmasq-base 2.82-1ubuntu1.1 dnsmasq-utils 2.82-1ubuntu1.1 Ubuntu 20.04 LTS: dnsmasq 2.80-1.1ubuntu1.2 dnsmasq-base 2.80-1.1ubuntu1.2 dnsmasq-utils 2.80-1.1ubuntu1.2 Ubuntu 18.04 LTS: dnsmasq 2.79-1ubuntu0.2 dnsmasq-base 2.79-1ubuntu0.2 dnsmasq-utils 2.79-1ubuntu0.2 Ubuntu 16.04 LTS: dnsmasq 2.75-1ubuntu0.16.04.7 dnsmasq-base 2.75-1ubuntu0.16.04.7 dnsmasq-utils 2.75-1ubuntu0.16.04.7 After a standard system update you need to reboot your computer to make all the necessary changes. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Moderate: dnsmasq security update Advisory ID: RHSA-2021:0156-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:0156 Issue date: 2021-01-19 CVE Names: CVE-2020-25684 CVE-2020-25685 CVE-2020-25686 ==================================================================== 1. Summary: An update for dnsmasq is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Moderate. 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. 7.4) - x86_64 Red Hat Enterprise Linux Server E4S (v. 7.4) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64 Red Hat Enterprise Linux Server Optional E4S (v. 7.4) - ppc64le, x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 7.4) - x86_64 Red Hat Enterprise Linux Server TUS (v. 7.4) - x86_64 3. Security Fix(es): * 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) 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/): 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 6. Package List: Red Hat Enterprise Linux Server AUS (v. 7.4): Source: dnsmasq-2.76-2.el7_4.3.src.rpm x86_64: dnsmasq-2.76-2.el7_4.3.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm Red Hat Enterprise Linux Server E4S (v. 7.4): Source: dnsmasq-2.76-2.el7_4.3.src.rpm ppc64le: dnsmasq-2.76-2.el7_4.3.ppc64le.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.ppc64le.rpm x86_64: dnsmasq-2.76-2.el7_4.3.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 7.4): Source: dnsmasq-2.76-2.el7_4.3.src.rpm x86_64: dnsmasq-2.76-2.el7_4.3.x86_64.rpm dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 7.4): x86_64: dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm Red Hat Enterprise Linux Server Optional E4S (v. 7.4): ppc64le: dnsmasq-debuginfo-2.76-2.el7_4.3.ppc64le.rpm dnsmasq-utils-2.76-2.el7_4.3.ppc64le.rpm x86_64: dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.3.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 7.4): x86_64: dnsmasq-debuginfo-2.76-2.el7_4.3.x86_64.rpm dnsmasq-utils-2.76-2.el7_4.3.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-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/updates/classification/#moderate https://access.redhat.com/security/vulnerabilities/RHSB-2021-001 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 iQIVAwUBYAbg5dzjgjWX9erEAQjfmA//U9huQUHWE5px5MpvL3/7ZlTnU3Q23tSz lOkHHhl4hwFmETAaVUv/Zoc1N7OfxHzC6C4ot2+rPFj+oMcZQeXUrfhKZkG5kWMn Qy/yIN9myOJ9jjM+2NmF+nQPAiIVi2fU/LkDIEYGXihDZB67/bvu2ErbX2dEOGaH ikX4JNYAVw8vnCZgRy2bbXq47Nff8oeys9sTcDWIq61Svg2mHYYtIoF4Xmz5N5u5 Gb+75FFSxlBoNQFbDyydm19UpGTGZ1dP5Giquvuv8hN0lXGDZN39TANk8FruwnB+ ibyRgzf1R3IwDKbMdkICVOtxfR6cMUXOk5fB6bygyL8Ki6o03N1/HPnQTOQ3XPDO Ya0eswXvMpG8DdhIPi6xlVhorxDj4QKaVKC82rnbb27KJP+UPC8KXfp8lEZSD0zX 56f2O2t42rjzrulnijDdeHtW6oI1MytA/hVLLM0Sdt6PYS19jflucnwP2UuZn0aR RRWjdK6Tx0OYxpPQBYVKygzm+0ke7Ee5BoGn+sYU5SZSH6ro0AlfIRVQn6XmTGUj Gotg6jc4a6HXjhrA72lkxvW9pzFVXpfiQ/VFhBblP39dcCXXyRfTSzgbutDAz7eu 5R8SwUBVIJ0e/Pp32WAMapLfKc+Pj9VG/INfwYYxtpWooy2cHk+3HZIy8gXylhCA lyNYjR6LrCc=sh0K -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

security feature problem

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

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

SOURCES

LAST UPDATE DATE

2024-11-20T22:25:10.869000+00:00

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