From their changelog: "...including a fix for a bug which allowed malformed DNS records to cause netsplits on a network. Triggering this issue is non-trivial and it may not occur in all circumstances, but all users are advised to upgrade." http://www.inspircd.org/2015/04/16/v2019-released.html Relevant commit: https://github.com/inspircd/inspircd/commit/6058483d9fbc1b904d5ae7cfea47bfcde5c5b559 @@ -700,8 +700,16 @@ DNSResult DNS::GetResult() /* Identical handling to PTR */ case DNS_QUERY_PTR: + { /* Reverse lookups just come back as char* */ resultstr = std::string((const char*)data.first); + if (resultstr.find_first_not_of("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-") != std::string::npos) + { + std::string ro = req->orig; + delete req; + return DNSResult(this_id | ERROR_MASK, "Invalid char(s) in reply", 0, ro); + } + } break; default: