PT-2019-6270 · Simon Kelley+7 · Dnsmasq+7

Dhananjay Arunesh + 1 · Published 2019-08-14 · Updated 2025-08-11 · CVE-2019-14834

Positive Technologies (AI Summary)

CVSS v2.0

4.3

Medium

Base vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Name of the Vulnerable Software and Affected Versions dnsmasq versions prior to 2.81

Description A memory leak in dnsmasq allows remote attackers to cause a denial of service via vectors involving DHCP response creation. The issue is related to the create helper() function in the /src/helper.c component of the DNS server, which is associated with unlimited memory allocation. This enables a remote attacker to exploit the vulnerability using a specially crafted DHCP response, leading to memory consumption and a denial of service.

Recommendations For versions prior to 2.81, update to version 2.81 or later to resolve the issue. As a temporary workaround, consider restricting access to the DHCP response creation functionality to minimize the risk of exploitation.

Fix

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

ALT-PU-2020-1712

ALT-PU-2021-1167

ALT-PU-2021-1217

BDU:2022-06243

CESA-2020_1715

CESA-2020_3878

CVE-2019-14834

MGASA-2019-0392

OPENSUSE-SU-2019:2669-1

OPENSUSE-SU-2019_2669-1

OPENSUSE-SU-2024:10721-1

RHSA-2020:1715

RHSA-2020:3878

RHSA-2020_1715

RHSA-2020_3878

SUSE-SU-2019:3188-1

SUSE-SU-2019:3189-1

SUSE-SU-2020:0419-1

SUSE-SU-2020_0419-1

SUSE-SU-2021:14603-1

SUSE-SU-2021_14603-1

USN-4698-1

USN-4698-2

USN-7689-1

Affected Products

Alt Linux

Astra Linux

Centos

Linuxmint

Red Hat

Suse

Ubuntu

Dnsmasq

References · 71

• https://osv.dev/vulnerability/SUSE-SU-2021:14603-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-14834 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4698-1 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14834 · Patch
• https://ubuntu.com/security/CVE-2020-25684 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-25682 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-25686 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-25685 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-14834 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4698-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-06243 · Security Note
• https://ubuntu.com/security/CVE-2020-25681 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4698-2 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:3189-1 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20251225SE16 · Vendor Advisory