Created
August 15, 2022 21:04
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Windows ETW DNS event source bug
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| The Windows ETW event source for DNS returns incorrect QueryResults when the DNS server sends additional A / AAAA records in the "ADDITIONAL" section of the DNS response packet. | |
| To fix, the code responsible for putting together the QueryResults value needs to only take into account records from the ANSWER section. | |
| =============== ETW Event =============== | |
| <Event MSec= "6447.1483" PID="7596" PName= "msedge" TID="5392" EventName="EventID(3008)" ProviderName="Microsoft-Windows-DNS-Client" FormattedMessage="DNS query is completed for the name baidu.com, type 1, query options 2,392,538,375,913,472 with status 0 Results 110.242.68.66;39.156.66.10;110.242.68.134;220.181.33.31;36.152.45.193;112.80.248.64;14.215.178.80;111.45.3.226;180.76.76.92;240e:bf:b801:1002:0:ff:b024:26de;240e:940:603:4:0:ff:b01b:589a; " QueryName="baidu.com" QueryType="1" QueryOptions="2,392,538,375,913,472" QueryStatus="0" QueryResults="110.242.68.66;39.156.66.10;110.242.68.134;220.181.33.31;36.152.45.193;112.80.248.64;14.215.178.80;111.45.3.226;180.76.76.92;240e:bf:b801:1002:0:ff:b024:26de;240e:940:603:4:0:ff:b01b:589a;"/> | |
| =============== DNS response (dig) =============== | |
| ;; QUESTION SECTION: | |
| ;baidu.com. IN A | |
| ;; ANSWER SECTION: | |
| baidu.com. 367 IN A 110.242.68.66 | |
| baidu.com. 367 IN A 39.156.66.10 | |
| ;; AUTHORITY SECTION: | |
| baidu.com. 39948 IN NS dns.baidu.com. | |
| baidu.com. 39948 IN NS ns2.baidu.com. | |
| baidu.com. 39948 IN NS ns7.baidu.com. | |
| baidu.com. 39948 IN NS ns4.baidu.com. | |
| baidu.com. 39948 IN NS ns3.baidu.com. | |
| ;; ADDITIONAL SECTION: | |
| dns.baidu.com. 355 IN A 110.242.68.134 | |
| ns2.baidu.com. 83148 IN A 220.181.33.31 | |
| ns3.baidu.com. 83148 IN A 112.80.248.64 | |
| ns3.baidu.com. 83148 IN A 36.152.45.193 | |
| ns4.baidu.com. 83148 IN A 111.45.3.226 | |
| ns4.baidu.com. 83148 IN A 14.215.178.80 | |
| ns7.baidu.com. 83148 IN A 180.76.76.92 | |
| ns7.baidu.com. 86358 IN AAAA 240e:bf:b801:1002:0:ff:b024:26de | |
| ns7.baidu.com. 86358 IN AAAA 240e:940:603:4:0:ff:b01b:589a | |
| =============== Sysmon Event =============== | |
| <EventData> | |
| <Data Name="RuleName">-</Data> | |
| <Data Name="UtcTime">2022-08-15 21:00:09.383</Data> | |
| <Data Name="ProcessGuid">{45b1307f-b3ae-62fa-e604-000000000500}</Data> | |
| <Data Name="ProcessId">7596</Data> | |
| <Data Name="QueryName">baidu.com</Data> | |
| <Data Name="QueryStatus">0</Data> | |
| <Data Name="QueryResults">110.242.68.66;39.156.66.10;110.242.68.134;220.181.33.31;36.152.45.193;112.80.248.64;14.215.178.80;111.45.3.226;180.76.76.92;240e:bf:b801:1002:0:ff:b024:26de;240e:940:603:4:0:ff:b01b:589a;</Data> | |
| <Data Name="Image">C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe</Data> | |
| <Data Name="User">DESKTOP-PR68551\anna</Data> | |
| </EventData> | |
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Essentially you don't know which IPs are actual IPs for the QueryName and which ones are for other names from additional section.