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Red Hat Enterprise Linux: RHSA-2019-3525 Moderate: dhcp DoS Issue

red hat
Calendar Grey November 5, 2019
Dist Redhat Esm H88
A new patch is ready for the DHCP service in RHEL 8, correcting several moderate vulnerabilities and fixing bugs.
An update for dhcp is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate

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

Summary

The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.
Security Fix(es):
* dhcp: double-deletion of the released addresses in the dhcpv6 code leading to crash and possible DoS (CVE-2019-6470)
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.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.1 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat DoS dhcp

References

https://access.redhat.com/security/cve/CVE-2019-6470 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.1_release_notes/

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: dhcp-4.3.6-34.el8.src.rpm
aarch64: dhcp-client-4.3.6-34.el8.aarch64.rpm dhcp-client-debuginfo-4.3.6-34.el8.aarch64.rpm dhcp-debuginfo-4.3.6-34.el8.aarch64.rpm dhcp-debugsource-4.3.6-34.el8.aarch64.rpm dhcp-libs-4.3.6-34.el8.aarch64.rpm dhcp-libs-debuginfo-4.3.6-34.el8.aarch64.rpm dhcp-relay-4.3.6-34.el8.aarch64.rpm dhcp-relay-debuginfo-4.3.6-34.el8.aarch64.rpm dhcp-server-4.3.6-34.el8.aarch64.rpm dhcp-server-debuginfo-4.3.6-34.el8.aarch64.rpm
noarch: dhcp-common-4.3.6-34.el8.noarch.rpm
ppc64le: dhcp-client-4.3.6-34.el8.ppc64le.rpm dhcp-client-debuginfo-4.3.6-34.el8.ppc64le.rpm dhcp-debuginfo-4.3.6-34.el8.ppc64le.rpm dhcp-debugsource-4.3.6-34.el8.ppc64le.rpm dhcp-libs-4.3.6-34.el8.ppc64le.rpm dhcp-libs-debuginfo-4.3.6-34.el8.ppc64le.rpm dhcp-relay-4.3.6-34.el8.ppc64le.rpm dhcp-relay-debuginfo-4.3.6-34.el8.ppc64le.rpm dhcp-server-4.3.6-34.el8.ppc64le.rpm dhcp-server-debuginfo-4.3.6-34.el8.ppc64le.rpm
s390x: dhcp-client-4.3.6-34.el8.s390x.rpm dhcp-client-debuginfo-4.3.6-34.el8.s390x.rpm dhcp-debuginfo-4.3.6-34.el8.s390x.rpm dhcp-debugsource-4.3.6-34.el8.s390x.rpm dhcp-libs-4.3.6-34.el8.s390x.rpm dhcp-libs-debuginfo-4.3.6-34.el8.s390x.rpm dhcp-relay-4.3.6-34.el8.s390x.rpm

Read the Full Advisory


Advisory ID: RHSA-2019:3525-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:3525
Issue date: 2019-11-05

Topic

An update for dhcp is now available for Red Hat Enterprise Linux 8.

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.

Topics%20covered

Topics Covered

security advisory moderate security update Red Hat DoS dhcp

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

1660865 - ISC dhcpd cannot start TLS session to 389-DS after updating openldap rpm

1685560 - Avoid unnecessary DHCPD restarts by NetworkManager on certain UP events w.r.t. bug #565921

1708641 - CVE-2019-6470 dhcp: double-deletion of the released addresses in the dhcpv6 code leading to crash and possible DoS

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