From the 1.8.0 changelog :
* bugfix #50: heap Out-of-bound Read vulnerability in
rr_frm_str_internal reported by pokerfacett.
* bugfix #51: Heap Out-of-bound Read vulnerability in
ldns_nsec3_salt_data reported by pokerfacett.
* Detect fixed time memory compare for openssl 0.9.8.
Please stable when ready (make a new bug & make it block this one), thanks!
*** Bug 831738 has been marked as a duplicate of this bug. ***
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.
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.
Both fixed in 1.8.0.