ID

VAR-202101-0220

CVE

CVE-2020-25684

TITLE

Dnsmasq is vulnerable to memory corruption and cache poisoning

DESCRIPTION

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, 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. ========================================================================== Ubuntu Security Notice USN-4698-2 February 24, 2021 dnsmasq regression ========================================================================== 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: USN-4698-1 introduced regressions in Dnsmasq. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: USN-4698-1 fixed vulnerabilities in Dnsmasq. The updates introduced regressions in certain environments related to issues with multiple queries, and issues with retries. Original advisory 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 2.82-1ubuntu1.2 dnsmasq-base 2.82-1ubuntu1.2 dnsmasq-utils 2.82-1ubuntu1.2 Ubuntu 20.04 LTS: dnsmasq 2.80-1.1ubuntu1.3 dnsmasq-base 2.80-1.1ubuntu1.3 dnsmasq-utils 2.80-1.1ubuntu1.3 Ubuntu 18.04 LTS: dnsmasq 2.79-1ubuntu0.3 dnsmasq-base 2.79-1ubuntu0.3 dnsmasq-utils 2.79-1ubuntu0.3 Ubuntu 16.04 LTS: dnsmasq 2.75-1ubuntu0.16.04.8 dnsmasq-base 2.75-1ubuntu0.16.04.8 dnsmasq-utils 2.75-1ubuntu0.16.04.8 After a standard system update you need to reboot your computer to make all the necessary changes. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Bug Fix(es): * Previously, the Red Hat Virtualization Host (RHV-H) repository (rhvh-4-for-rhel-8-x86_64-rpms) did not include the libsmbclient package, which is a dependency for the sssd-ad package. Consequently, the sssd-ad package failed to install. With this update, the libsmbclient is now in the RHV-H repository, and sssd-ad now installs on RHV-H. (BZ#1868967) 4. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Moderate: dnsmasq security update Advisory ID: RHSA-2021:0153-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:0153 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. 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 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. 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 Client (v. 7): Source: dnsmasq-2.76-16.el7_9.1.src.rpm x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: dnsmasq-2.76-16.el7_9.1.src.rpm x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: dnsmasq-2.76-16.el7_9.1.src.rpm ppc64: dnsmasq-2.76-16.el7_9.1.ppc64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm ppc64le: dnsmasq-2.76-16.el7_9.1.ppc64le.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm s390x: dnsmasq-2.76-16.el7_9.1.s390x.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.s390x.rpm x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64.rpm dnsmasq-utils-2.76-16.el7_9.1.ppc64.rpm ppc64le: dnsmasq-debuginfo-2.76-16.el7_9.1.ppc64le.rpm dnsmasq-utils-2.76-16.el7_9.1.ppc64le.rpm s390x: dnsmasq-debuginfo-2.76-16.el7_9.1.s390x.rpm dnsmasq-utils-2.76-16.el7_9.1.s390x.rpm x86_64: dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm dnsmasq-utils-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: dnsmasq-2.76-16.el7_9.1.src.rpm x86_64: dnsmasq-2.76-16.el7_9.1.x86_64.rpm dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: dnsmasq-debuginfo-2.76-16.el7_9.1.x86_64.rpm dnsmasq-utils-2.76-16.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-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 iQIVAwUBYAblHdzjgjWX9erEAQg6Xg//fXZBawqLgCXhC7jToJJgUA+WoERkMbil Vs5+OP4vp+nT2iA92mQ84rLTQG2tL2xhPfMxLVl+9aCH44RjJjmQ8F/ODvYxRCe4 MopmumQIwfGMAFK/n16jHAmkg+qMZa3ehUp+LuawnsIuGtC7BmiohLTZqjxFj754 6h79AhB8/zeX1buyqEBgo8kCTy/L+TRW/Xg/ENi6a6NTnwG3f2n89oxUOCASm2cA YF2Qc1L8yqd/5YXBA8E3gRouBe2caThWUo0qrG9ois7lYIJKlxzo9sq3n6qfc8bN hZ/OAKvNSnRSrC4AW8kHVskv0hR8kC+iX05ryujBdGRLiafHl9hLGy2E0qRR3mm3 hNyjhKzBNxwZZ3gF8nOQJyWtxSYJSwbl6n01ElEs+QexMKi/f+x8hML1BS1rf/tG JuOOyLTUGjWIdmmLEKNQa/A5h0rWwJhNhVKuK+iNGXTey8C1JmeNaYpeOn8JdK1E iS8ZT48mfu8MxvGVVbv8ARfMQtsWSo1IOMD/ttUh2SPflZ1Qpd2sGTR5sIJrq2JD XlWePyzEQSL0UEJ8FgYOeJJEt9Q/gWgiug7ZBZrmanzLaNv0DA0dLsD8kE/p2mml j6kxe9R0XnpTxnDTzKmmCaEXCFsrJIg872+57VfVbCeFcwV6pZMNMFACmMI6DJgX sGV/jc2cn78=iw2j -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 8.1) - aarch64, ppc64le, s390x, x86_64 3. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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 . For the stable distribution (buster), these problems have been fixed in version 2.80-1+deb10u1. 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-----

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

arbitrary

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

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

SOURCES

LAST UPDATE DATE

2024-09-17T21:25:07.430000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE