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Exam 312-49v10 All Questions

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Exam 312-49v10 topic 1 question 34 discussion

Actual exam question from ECCouncil's 312-49v10
Question #: 34
Topic #: 1
[All 312-49v10 Questions]

Study the log given below and answer the following question:
Apr 24 14:46:46 [4663]: spp_portscan: portscan detected from 194.222.156.169
Apr 24 14:46:46 [4663]: IDS27/FIN Scan: 194.222.156.169:56693 -> 172.16.1.107:482
Apr 24 18:01:05 [4663]: IDS/DNS-version-query: 212.244.97.121:3485 -> 172.16.1.107:53
Apr 24 19:04:01 [4663]: IDS213/ftp-passwd-retrieval: 194.222.156.169:1425 -> 172.16.1.107:21
Apr 25 08:02:41 [5875]: spp_portscan: PORTSCAN DETECTED from 24.9.255.53
Apr 25 02:08:07 [5875]: IDS277/DNS-version-query: 63.226.81.13:4499 -> 172.16.1.107:53
Apr 25 02:08:07 [5875]: IDS277/DNS-version-query: 63.226.81.13:4630 -> 172.16.1.101:53
Apr 25 02:38:17 [5875]: IDS/RPC-rpcinfo-query: 212.251.1.94:642 -> 172.16.1.107:111
Apr 25 19:37:32 [5875]: IDS230/web-cgi-space-wildcard: 198.173.35.164:4221 -> 172.16.1.107:80
Apr 26 05:45:12 [6283]: IDS212/dns-zone-transfer: 38.31.107.87:2291 -> 172.16.1.101:53
Apr 26 06:43:05 [6283]: IDS181/nops-x86: 63.226.81.13:1351 -> 172.16.1.107:53
Apr 26 06:44:25 victim7 PAM_pwdb[12509]: (login) session opened for user simple by (uid=0)
Apr 26 06:44:36 victim7 PAM_pwdb[12521]: (su) session opened for user simon by simple(uid=506)
Apr 26 06:45:34 [6283]: IDS175/socks-probe: 24.112.167.35:20 -> 172.16.1.107:1080
Apr 26 06:52:10 [6283]: IDS127/telnet-login-incorrect: 172.16.1.107:23 -> 213.28.22.189:4558
Precautionary measures to prevent this attack would include writing firewall rules. Of these firewall rules, which among the following would be appropriate?

  • A. Disallow UDP53 in from outside to DNS server
  • B. Allow UDP53 in from DNS server to outside
  • C. Disallow TCP53 in from secondaries or ISP server to DNS server
  • D. Block all UDP traffic
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by bjornborg at June 5, 2023, 12:40 p.m.

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Elb
6 months, 2 weeks ago
Selected Answer: A
A > seems that all started on Apr 25 02:08:07.. then we see same srcip doing a buffer overflow the next following day.. Apr 26 06:43:05 [6283]: IDS181/nops-x86: 63.226.81.13:1351 -> 172.16.1.107:53 So dropping all unsolicited inbound traffic with a destination port of 53 protects the network and it is appropriate.
upvoted 2 times
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bjornborg
1 year, 5 months ago
Selected Answer: C
i think C. You don't want to allow external DNS xfers, and those are done via TCP53, not UDP53. UDP53 is just for lookups which is what DNS does, so normally doesn't require any additional security
upvoted 1 times
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