Home/CVE/A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eve
CVE

CVE-2018-5733

A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eve

A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 - 4.1-ESV-R15, 4.2.0 - 4.2.8, 4.3.0 - 4.3.6, 4.4.0.

HIGH · CVSS 7.5 EPSS 0.09822
Schedule remediation
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules3 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

10
isc dhcp>= 4.2.0 and <= 4.2.8
isc dhcp>= 4.3.0 and <= 4.3.6
isc dhcpall versions
redhat enterprise linux desktopall versions
redhat enterprise linux serverall versions
redhat enterprise linux server ausall versions
redhat enterprise linux server eusall versions
redhat enterprise linux workstationall versions
◈

Sigma Hunt Rules

3
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighDHCP Server Error Failed Loading the CallOut DLL
producthighDHCP Server Loaded the CallOut DLL
producthighDHCP Callout DLL Installation
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-officer@isc.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Jan 2019 · 08:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

8
suse-csafopenSUSE-SU-2024:10715-1
usnUSN-3586-2
suse-csafSUSE-SU-2018:0810-1
suse-csafSUSE-SU-2018:0810-2
suse-csafSUSE-SU-2018:0812-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/103188Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040437Third Party AdvisoryVDB Entry
https://kb.isc.org/docs/aa-01567Vendor Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00015.htmlThird Party Advisory
https://usn.ubuntu.com/3586-1/Third Party Advisory
https://usn.ubuntu.com/3586-2/Third Party Advisory
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