CVE-2020-19861 — HIGH (7.5)

Vulnerability Description

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.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Nlnetlabs	Ldns	1.7.1

Related Weaknesses (CWE)

CWE-125

References

https://cwe.mitre.org/data/definitions/126.htmlThird Party Advisory
https://github.com/NLnetLabs/ldns/issues/51ExploitIssue TrackingThird Party Advisory
https://cwe.mitre.org/data/definitions/126.htmlThird Party Advisory
https://github.com/NLnetLabs/ldns/issues/51ExploitIssue TrackingThird Party Advisory

FAQ

What is CVE-2020-19861?

CVE-2020-19861 is a vulnerability with a CVSS score of 7.5 (HIGH). 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_rd...

How severe is CVE-2020-19861?

CVE-2020-19861 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-19861?

Check the references section above for vendor advisories and patch information. Affected products include: Nlnetlabs Ldns.