PT-2018-1049 · Isc+5 · Isc Dhcp+5

Felix Wilhelm · Published 2018-02-09 · Updated 2025-04-25 · CVE-2018-5733

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions ISC DHCP versions 4.1.0 through 4.1-ESV-R15 ISC DHCP versions 4.2.0 through 4.2.8 ISC DHCP versions 4.3.0 through 4.3.6 ISC DHCP versions 4.4.0

Description The issue is caused by the potential overflow of a 32-bit reference counter when a malicious client sends a large amount of traffic to a DHCP server. This can cause the dhcpd service to crash, resulting in a denial of service. A remote attacker can exploit this by sending a large number of specially crafted DHCP requests, potentially exceeding a billion packets.

Recommendations For ISC DHCP versions 4.1.0 through 4.1-ESV-R15, update to a version that fixes the issue. For ISC DHCP versions 4.2.0 through 4.2.8, update to a version that fixes the issue. For ISC DHCP versions 4.3.0 through 4.3.6, update to a version that fixes the issue. For ISC DHCP versions 4.4.0, update to a version that fixes the issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

ALT-PU-2018-1300

BDU:2018-00357

CESA-2018_0469

CESA-2018_0483

CVE-2018-5733

DLA-1313-1

DSA-4133-1

MGASA-2018-0410

OPENSUSE-SU-2024:10715-1

RHSA-2018:0469

RHSA-2018:0483

RHSA-2018_0469

RHSA-2018_0483

SUSE-SU-2018:0810-1

SUSE-SU-2018:0810-2

SUSE-SU-2018:0812-1

USN-3586-1

USN-3586-2

Affected Products

Alt Linux

Centos

Isc Dhcp

Red Hat

Suse

Ubuntu

References · 80

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5733 · Security Note
• https://ubuntu.com/security/CVE-2017-3144 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2018:0469 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-5733 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3144 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2018:0810-2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-5733 · Security Note
• https://bdu.fstec.ru/vul/2018-00356 · Security Note
• https://advisories.mageia.org/MGASA-2018-0410.html · Security Note
• https://security-tracker.debian.org/tracker/CVE-2018-5733 · Vendor Advisory
• https://security-tracker.debian.org/tracker/source-package/isc-dhcp · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-5733 · Security Note
• https://osv.dev/vulnerability/USN-3586-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2018-5733 · Vendor Advisory
• https://kb.isc.org/docs/aa-01567 · Vendor Advisory