ldns - security update


It was discovered that there were four issues in ldns, a library used in Domain Name System (DNS) related programs: * [CVE-2020-19860](https://security-tracker.debian.org/tracker/CVE-2020-19860) When ldns version 1.7.1 verifies a zone file, the ldns\_rr\_new\_frm\_str\_internal function has a heap out of bounds read vulnerability. An attacker can leak information on the heap by constructing a zone file payload. * [CVE-2020-19861](https://security-tracker.debian.org/tracker/CVE-2020-19861) 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. * [CVE-2017-1000231](https://security-tracker.debian.org/tracker/CVE-2017-1000231) A double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors. * [CVE-2017-1000232](https://security-tracker.debian.org/tracker/CVE-2017-1000232) A double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors. For Debian 9 Stretch, these four problems have been fixed in version 1.7.0-1+deb9u1. We recommend that you upgrade your ldns packages. Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: <https://wiki.debian.org/LTS>

Affected Software

CPE Name Name Version
ldns 1.7.0-1