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CVE-2020-19861

Published: 21 January 2022

When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap overflow information leakage.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
ldns
Launchpad, Ubuntu, Debian
kinetic Ignored
(end of life, was needed)
focal
Released (1.7.0-4.1ubuntu1+esm1)
Available with Ubuntu Pro
lunar Not vulnerable
(1.8.1-1)
jammy
Released (1.7.1-2ubuntu4+esm1)
Available with Ubuntu Pro
bionic
Released (1.7.0-3ubuntu4.1)
impish Ignored
(end of life)
trusty Ignored
(end of standard support)
upstream
Released (1.8.0)
xenial
Released (1.6.17-8ubuntu0.1+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
mantic Not vulnerable
(1.8.1-1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N