CVE-2020-19861

2022-01-2115:15:07

Debian Security Bug Tracker

security-tracker.debian.org

ldns 1.7.1

zone file parsing

ldns_nsec3_salt_data

heap overflow

information leakage

unix

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.002

Percentile

56.0%

JSON

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.

OSVersionArchitecturePackageVersionFilename
Debian12allldns< 1.8.1-1ldns_1.8.1-1_all.deb
Debian11allldns<= 1.7.1-2ldns_1.7.1-2_all.deb
Debian999allldns< 1.8.1-1ldns_1.8.1-1_all.deb
Debian13allldns< 1.8.1-1ldns_1.8.1-1_all.deb

OS	Version	Architecture	Package	Version	Filename
Debian	12	all	ldns	< 1.8.1-1	ldns_1.8.1-1_all.deb
Debian	11	all	ldns	<= 1.7.1-2	ldns_1.7.1-2_all.deb
Debian	999	all	ldns	< 1.8.1-1	ldns_1.8.1-1_all.deb
Debian	13	all	ldns	< 1.8.1-1	ldns_1.8.1-1_all.deb