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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-19861
Reference (s):
- https://github.com/NLnetLabs/ldns/issues/51