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 base score: 7.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-19861
• https://github.com/NLnetLabs/ldns/issues/51
• https://github.com/NLnetLabs/ldns/commit/136ec420437041fe13f344a2053e774f9050cc38
• https://ubuntu.com/security/notices/USN-5257-1
• NVD
• Launchpad
• Debian