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MitreCVE-2020-19861

HistoryJan 21, 2022 - 3:15 p.m.

CVE-2020-19861

2022-01-2115:15:07

CWE-125

mitre

web.nvd.nist.gov

cve-2020-19861

ldns 1.7.1

zone file

ldns_nsec3_salt_data

memcpy

heap overflow

information leakage

nvd

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

AI Score

7.4

Confidence

High

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.

Affected configurations

Nvd

Node

nlnetlabsldnsMatch1.7.1

VendorProductVersionCPE
nlnetlabsldns1.7.1cpe:2.3:a:nlnetlabs:ldns:1.7.1:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
nlnetlabs	ldns	1.7.1	cpe:2.3:a:nlnetlabs:ldns:1.7.1:::::::*

References

cwe.mitre.org/data/definitions/126.html

github.com/NLnetLabs/ldns/issues/51

Social References

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

AI Score

7.4

Confidence

High

EPSS

0.002

Percentile

56.0%

JSON

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