Red Hat Security Advisory 2021-0151-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server. Issues addressed include a buffer overflow vulnerability.
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Red Hat Security Advisory
Synopsis: Important: dnsmasq security update
Advisory ID: RHSA-2021:0151-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0151
Issue date: 2021-01-19
CVE Names: CVE-2020-25681 CVE-2020-25682 CVE-2020-25683
CVE-2020-25684 CVE-2020-25685 CVE-2020-25686
CVE-2020-25687
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1. Summary:
An update for dnsmasq is now available for Red Hat Enterprise Linux 8.2
Extended Update Support.
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 AppStream EUS (v. 8.2) - aarch64, ppc64le, s390x, x86_64
3. Description:
The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name
Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server.
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.
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/):
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. 8.2):
Source:
dnsmasq-2.79-11.el8_2.2.src.rpm
aarch64:
dnsmasq-2.79-11.el8_2.2.aarch64.rpm
dnsmasq-debuginfo-2.79-11.el8_2.2.aarch64.rpm
dnsmasq-debugsource-2.79-11.el8_2.2.aarch64.rpm
dnsmasq-utils-2.79-11.el8_2.2.aarch64.rpm
dnsmasq-utils-debuginfo-2.79-11.el8_2.2.aarch64.rpm
ppc64le:
dnsmasq-2.79-11.el8_2.2.ppc64le.rpm
dnsmasq-debuginfo-2.79-11.el8_2.2.ppc64le.rpm
dnsmasq-debugsource-2.79-11.el8_2.2.ppc64le.rpm
dnsmasq-utils-2.79-11.el8_2.2.ppc64le.rpm
dnsmasq-utils-debuginfo-2.79-11.el8_2.2.ppc64le.rpm
s390x:
dnsmasq-2.79-11.el8_2.2.s390x.rpm
dnsmasq-debuginfo-2.79-11.el8_2.2.s390x.rpm
dnsmasq-debugsource-2.79-11.el8_2.2.s390x.rpm
dnsmasq-utils-2.79-11.el8_2.2.s390x.rpm
dnsmasq-utils-debuginfo-2.79-11.el8_2.2.s390x.rpm
x86_64:
dnsmasq-2.79-11.el8_2.2.x86_64.rpm
dnsmasq-debuginfo-2.79-11.el8_2.2.x86_64.rpm
dnsmasq-debugsource-2.79-11.el8_2.2.x86_64.rpm
dnsmasq-utils-2.79-11.el8_2.2.x86_64.rpm
dnsmasq-utils-debuginfo-2.79-11.el8_2.2.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-2020-25681
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/updates/classification/#important
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.
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