RedHat: RHSA-2021-0151:01 Important: dnsmasq security update
Summary
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.
Summary
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
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
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/
Topic
An update for dnsmasq is now available for Red Hat Enterprise Linux 8.2Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux AppStream EUS (v. 8.2) - aarch64, ppc64le, s390x, x86_64
Bugs Fixed
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
