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Cisco ASA: Fix message 106100 #20245

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Jul 28, 2020
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Cisco ASA: Fix message 106100 #20245

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1 change: 1 addition & 0 deletions CHANGELOG.next.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -223,6 +223,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
- Fix Filebeat OOMs on very long lines {issue}19500[19500], {pull}19552[19552]
- Fix s3 input parsing json file without expand_event_list_from_field. {issue}19902[19902] {pull}19962[19962]
- Fix millisecond timestamp normalization issues in CrowdStrike module {issue}20035[20035], {pull}20138[20138]
- Fix support for message code 106100 in Cisco ASA and FTD. {issue}19350[19350] {pull}20245[20245]

*Heartbeat*

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2 changes: 2 additions & 0 deletions x-pack/filebeat/module/cisco/asa/test/asa-fix.log
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Original file line number Diff line number Diff line change
Expand Up @@ -5,3 +5,5 @@ Apr 17 2020 14:16:20 SNL-ASA-VPN-A01 : %ASA-4-106023: Deny udp src Inside:10.123
Apr 17 2020 14:15:07 SNL-ASA-VPN-A01 : %ASA-2-106017: Deny IP due to Land Attack from 10.123.123.123 to 10.123.123.123
Apr 17 2020 14:15:07 SNL-ASA-VPN-A01 : %ASA-3-313008: Denied IPv6-ICMP type=134, code=0 from fe80::1ff:fe23:4567:890a on interface ISP1
Jun 08 2020 12:59:57: %ASA-4-313009: Denied invalid ICMP code 9, for Inside:10.255.0.206/8795 (10.255.0.206/8795) to identity:10.12.31.51/0 (10.12.31.51/0), ICMP id 295, ICMP type 8
Oct 20 2019 15:42:53: %ASA-6-106100: access-list incoming permitted udp dmz2/127.2.3.4(56575) -> inside/127.3.4.5(53) hit-cnt 1 first hit [0x93d0e533, 0x578ef52f]
Oct 20 2019 15:42:54: %ASA-6-106100: access-list incoming permitted udp dmz2/127.2.3.4(56575)(LOCAL\\username) -> inside/127.3.4.5(53) hit-cnt 1 first hit [0x93d0e533, 0x578ef52f]
86 changes: 86 additions & 0 deletions x-pack/filebeat/module/cisco/asa/test/asa-fix.log-expected.json
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Expand Up @@ -299,5 +299,91 @@
"cisco-asa",
"forwarded"
]
},
{
"cisco.asa.destination_interface": "inside",
"cisco.asa.message_id": "106100",
"cisco.asa.rule_name": "incoming",
"cisco.asa.source_interface": "dmz2",
"destination.address": "127.3.4.5",
"destination.ip": "127.3.4.5",
"destination.port": 53,
"event.action": "firewall-rule",
"event.category": [
"network"
],
"event.code": 106100,
"event.dataset": "cisco.asa",
"event.kind": "event",
"event.module": "cisco",
"event.original": "%ASA-6-106100: access-list incoming permitted udp dmz2/127.2.3.4(56575) -> inside/127.3.4.5(53) hit-cnt 1 first hit [0x93d0e533, 0x578ef52f]",
"event.outcome": "allow",
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allow isn't one of the allowed values for event.outcome.

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I've created an issue: #20253

"event.severity": 6,
"event.timezone": "-02:00",
"event.type": [
"info",
"allowed"
],
"fileset.name": "asa",
"input.type": "log",
"log.level": "informational",
"log.offset": 1171,
"network.iana_number": 17,
"network.transport": "udp",
"related.ip": [
"127.2.3.4",
"127.3.4.5"
],
"service.type": "cisco",
"source.address": "127.2.3.4",
"source.ip": "127.2.3.4",
"source.port": 56575,
"tags": [
"cisco-asa",
"forwarded"
]
},
{
"cisco.asa.destination_interface": "inside",
"cisco.asa.message_id": "106100",
"cisco.asa.rule_name": "incoming",
"cisco.asa.source_interface": "dmz2",
"destination.address": "127.3.4.5",
"destination.ip": "127.3.4.5",
"destination.port": 53,
"event.action": "firewall-rule",
"event.category": [
"network"
],
"event.code": 106100,
"event.dataset": "cisco.asa",
"event.kind": "event",
"event.module": "cisco",
"event.original": "%ASA-6-106100: access-list incoming permitted udp dmz2/127.2.3.4(56575)(LOCAL\\\\username) -> inside/127.3.4.5(53) hit-cnt 1 first hit [0x93d0e533, 0x578ef52f]",
"event.outcome": "allow",
"event.severity": 6,
"event.timezone": "-02:00",
"event.type": [
"info",
"allowed"
],
"fileset.name": "asa",
"input.type": "log",
"log.level": "informational",
"log.offset": 1334,
"network.iana_number": 17,
"network.transport": "udp",
"related.ip": [
"127.2.3.4",
"127.3.4.5"
],
"service.type": "cisco",
"source.address": "127.2.3.4",
"source.ip": "127.2.3.4",
"source.port": 56575,
"tags": [
"cisco-asa",
"forwarded"
]
}
]
2 changes: 1 addition & 1 deletion x-pack/filebeat/module/cisco/shared/ingest/asa-ftd-pipeline.yml
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Expand Up @@ -253,7 +253,7 @@ processors:
- dissect:
if: "ctx._temp_.cisco.message_id == '106100'"
field: "message"
pattern: "access-list %{_temp_.cisco.list_id} %{event.outcome} %{network.transport} %{_temp_.cisco.source_interface}/%{source.address}(%{source.port}) -> %{_temp_.cisco.destination_interface}/%{destination.address}(%{destination.port}) %{}"
pattern: "access-list %{_temp_.cisco.list_id} %{event.outcome} %{network.transport} %{_temp_.cisco.source_interface}/%{source.address}(%{source.port})%{}-> %{_temp_.cisco.destination_interface}/%{destination.address}(%{destination.port})%{}"
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Did we want to add the ECS mapping to the user if we can identify the field as such? As indicated by the docs the thing we were missing is one of the following:

idfw_user— The user identity username, including the domain name that is added to the existing syslog when the ASA can find the username for the IP address.
sg_info— The security group tag that is added to the syslog when the ASA can find a security group tag for the IP address. The security group name is displayed with the security group tag, if available.

If we just want this as a bugfix to not drop the event that's cool too, as I'm not entirely sure how to distinguish idfw_user v. sg_info.

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Yeah, it's both issues, didn't want to complicate the parsing even more for a bug fix, and I don't see an easy way of telling user and info apart.

- dissect:
if: "ctx._temp_.cisco.message_id == '106102'"
field: "message"
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