Home/CVE/Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masqu
CVE

CVE-2018-5732

Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masqu

Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 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 0.02521
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules3 YARA rules0
⬡

Weakness Classification

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
▤

Affected Products & Versions

4
isc dhcp>= 4.1.0 and <= 4.1.2
isc dhcp>= 4.2.0 and < 4.2.8
isc dhcp>= 4.3.0 and < 4.3.6
isc dhcpall 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 NVD09 Oct 2019 · 04:15 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

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.isc.org/docs/aa-01565Vendor Advisory
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