AWS ELB SSL Policies

Severity: medium
Compliance: PCI 2.2.3, 4.1
Tags: AWS, Panther, Initial Access:Exploit Public-Facing Application
Reference: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/create-https-listener.html
Source: github.com/panther-labs/panther-analysis

Ensures that deprecated TLS versions are not supported in internet-facing load balancers

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application

Rule body yaml

AnalysisType: policy
Filename: aws_alb_ssl_policy.py
PolicyID: "AWS.ELBv2.SSLPolicy"
DisplayName: "AWS ELB SSL Policies"
Enabled: true
ResourceTypes:
  - AWS.ELBV2.ApplicationLoadBalancer
Tags:
  - AWS
  - Panther
  - Initial Access:Exploit Public-Facing Application
Reports:
  PCI:
    - 2.2.3
    - 4.1
  MITRE ATT&CK:
    - TA0001:T1190
Severity: Medium
Description: Ensures that deprecated TLS versions are not supported in internet-facing load balancers
Runbook: >
  Update your load balancer's SSLPolicies to only support modern TLS versions
Reference: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/create-https-listener.html
Tests:
  - Name: Strong Ciphers Internet Facing
    ExpectedResult: true
    Resource:
      {
        "IpAddressType": "ipv4",
        "Type": "application",
        "Tags": { "Application": "Test" },
        "AvailabilityZones":
          [
            {
              "LoadBalancerAddresses": null,
              "ZoneName": "us-east-1b",
              "SubnetId": "subnet-05f7b81cc5d97e0e2",
            },
            {
              "ZoneName": "us-east-1a",
              "SubnetId": "subnet-07419606a40f4c414",
              "LoadBalancerAddresses": null,
            },
          ],
        "AccountId": "123456789012",
        "DNSName": "web-360787852.us-east-1.elb.amazonaws.com",
        "Listeners":
          [
            {
              "DefaultActions":
                [
                  {
                    "RedirectConfig": null,
                    "ForwardConfig":
                      {
                        "TargetGroups":
                          [
                            {
                              "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:targetgroup/web/54eedfcacc3949ef",
                              "Weight": 1,
                            },
                          ],
                        "TargetGroupStickinessConfig":
                          { "Enabled": false, "DurationSeconds": null },
                      },
                    "AuthenticateOidcConfig": null,
                    "Order": null,
                    "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:targetgroup/web/54eedfcacc3949ef",
                    "FixedResponseConfig": null,
                    "AuthenticateCognitoConfig": null,
                    "Type": "forward",
                  },
                ],
              "Port": 443,
              "Certificates":
                [
                  {
                    "IsDefault": null,
                    "CertificateArn": "arn:aws:acm:us-east-1:123456789012:certificate/10c4e713-9bb5-4ccf-aabc-1c9119370038",
                  },
                ],
              "Protocol": "HTTPS",
              "ListenerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:listener/app/web/3ff2fab33a993e0c/995359b182328b77",
              "SslPolicy": "ELBSecurityPolicy-2016-08",
              "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
            },
          ],
        "ResourceId": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
        "Scheme": "internet-facing",
        "VpcId": "vpc-0aa6688dd88484847",
        "State": { "Code": "active", "Reason": null },
        "Name": "web",
        "SSLPolicies":
          {
            "ELBSecurityPolicy-FS-1-2-2019-08":
              {
                "SslProtocols": ["TLSv1.2"],
                "Ciphers":
                  [
                    { "Name": "ECDHE-ECDSA-AES128-GCM-SHA256", "Priority": 1 },
                    { "Name": "ECDHE-RSA-AES128-GCM-SHA256", "Priority": 2 },
                    { "Name": "ECDHE-ECDSA-AES128-SHA256", "Priority": 3 },
                    { "Name": "ECDHE-RSA-AES128-SHA256", "Priority": 4 },
                    { "Name": "ECDHE-ECDSA-AES128-SHA", "Priority": 5 },
                    { "Name": "ECDHE-RSA-AES128-SHA", "Priority": 6 },
                    { "Name": "ECDHE-ECDSA-AES256-GCM-SHA384", "Priority": 7 },
                    { "Name": "ECDHE-RSA-AES256-GCM-SHA384", "Priority": 8 },
                    { "Name": "ECDHE-ECDSA-AES256-SHA384", "Priority": 9 },
                    { "Name": "ECDHE-RSA-AES256-SHA384", "Priority": 10 },
                    { "Name": "ECDHE-RSA-AES256-SHA", "Priority": 11 },
                    { "Name": "ECDHE-ECDSA-AES256-SHA", "Priority": 12 },
                  ],
                "Name": "ELBSecurityPolicy-FS-1-2-2019-08",
              },
          },
        "Arn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
        "Region": "us-east-1",
        "SecurityGroups": ["sg-000bbcc377444490b"],
        "TimeCreated": "2020-03-24T21:39:15.050Z",
        "WebAcl": null,
        "CanonicalHostedZonedId": "Z1H1FL5HABSF5",
        "ResourceType": "AWS.ELBV2.ApplicationLoadBalancer",
      }
  - Name: Default Ciphers
    ExpectedResult: false
    Resource:
      {
        "IpAddressType": "ipv4",
        "Type": "application",
        "Tags": { "Application": "Test" },
        "AvailabilityZones":
          [
            {
              "LoadBalancerAddresses": null,
              "ZoneName": "us-east-1b",
              "SubnetId": "subnet-05f7b81cc5d97e0e2",
            },
            {
              "ZoneName": "us-east-1a",
              "SubnetId": "subnet-07419606a40f4c414",
              "LoadBalancerAddresses": null,
            },
          ],
        "AccountId": "123456789012",
        "DNSName": "web-360787852.us-east-1.elb.amazonaws.com",
        "Listeners":
          [
            {
              "DefaultActions":
                [
                  {
                    "RedirectConfig": null,
                    "ForwardConfig":
                      {
                        "TargetGroups":
                          [
                            {
                              "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:targetgroup/web/54eedfcacc3949ef",
                              "Weight": 1,
                            },
                          ],
                        "TargetGroupStickinessConfig":
                          { "Enabled": false, "DurationSeconds": null },
                      },
                    "AuthenticateOidcConfig": null,
                    "Order": null,
                    "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:targetgroup/web/54eedfcacc3949ef",
                    "FixedResponseConfig": null,
                    "AuthenticateCognitoConfig": null,
                    "Type": "forward",
                  },
                ],
              "Port": 443,
              "Certificates":
                [
                  {
                    "IsDefault": null,
                    "CertificateArn": "arn:aws:acm:us-east-1:123456789012:certificate/10c4e713-9bb5-4ccf-aabc-1c9119370038",
                  },
                ],
              "Protocol": "HTTPS",
              "ListenerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:listener/app/web/3ff2fab33a993e0c/995359b182328b77",
              "SslPolicy": "ELBSecurityPolicy-2016-08",
              "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
            },
          ],
        "ResourceId": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
        "Scheme": "internet-facing",
        "VpcId": "vpc-0aa6688dd88484847",
        "State": { "Code": "active", "Reason": null },
        "Name": "web",
        "SSLPolicies":
          {
            "ELBSecurityPolicy-2016-08":
              {
                "Ciphers":
                  [
                    { "Priority": 1, "Name": "ECDHE-ECDSA-AES128-GCM-SHA256" },
                    { "Priority": 2, "Name": "ECDHE-RSA-AES128-GCM-SHA256" },
                    { "Priority": 3, "Name": "ECDHE-ECDSA-AES128-SHA256" },
                    { "Priority": 4, "Name": "ECDHE-RSA-AES128-SHA256" },
                    { "Priority": 5, "Name": "ECDHE-ECDSA-AES128-SHA" },
                    { "Priority": 6, "Name": "ECDHE-RSA-AES128-SHA" },
                    { "Priority": 7, "Name": "ECDHE-ECDSA-AES256-GCM-SHA384" },
                    { "Name": "ECDHE-RSA-AES256-GCM-SHA384", "Priority": 8 },
                    { "Name": "ECDHE-ECDSA-AES256-SHA384", "Priority": 9 },
                    { "Priority": 10, "Name": "ECDHE-RSA-AES256-SHA384" },
                    { "Priority": 11, "Name": "ECDHE-RSA-AES256-SHA" },
                    { "Name": "ECDHE-ECDSA-AES256-SHA", "Priority": 12 },
                    { "Priority": 13, "Name": "AES128-GCM-SHA256" },
                    { "Name": "AES128-SHA256", "Priority": 14 },
                    { "Priority": 15, "Name": "AES128-SHA" },
                    { "Name": "AES256-GCM-SHA384", "Priority": 16 },
                    { "Priority": 17, "Name": "AES256-SHA256" },
                    { "Priority": 18, "Name": "AES256-SHA" },
                  ],
                "SslProtocols": ["TLSv1", "TLSv1.1", "TLSv1.2"],
                "Name": "ELBSecurityPolicy-2016-08",
              },
          },
        "Arn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
        "Region": "us-east-1",
        "SecurityGroups": ["sg-000bbcc377444490b"],
        "TimeCreated": "2020-03-24T21:39:15.050Z",
        "WebAcl": null,
        "CanonicalHostedZonedId": "Z1H1FL5HABSF5",
        "ResourceType": "AWS.ELBV2.ApplicationLoadBalancer",
      }
  - Name: Default Ciphers Internal Load Balancer
    ExpectedResult: true
    Resource:
      {
        "IpAddressType": "ipv4",
        "Type": "application",
        "Tags": { "Application": "Test" },
        "AvailabilityZones":
          [
            {
              "LoadBalancerAddresses": null,
              "ZoneName": "us-east-1b",
              "SubnetId": "subnet-05f7b81cc5d97e0e2",
            },
            {
              "ZoneName": "us-east-1a",
              "SubnetId": "subnet-07419606a40f4c414",
              "LoadBalancerAddresses": null,
            },
          ],
        "AccountId": "123456789012",
        "DNSName": "web-360787852.us-east-1.elb.amazonaws.com",
        "Listeners":
          [
            {
              "DefaultActions":
                [
                  {
                    "RedirectConfig": null,
                    "ForwardConfig":
                      {
                        "TargetGroups":
                          [
                            {
                              "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:targetgroup/web/54eedfcacc3949ef",
                              "Weight": 1,
                            },
                          ],
                        "TargetGroupStickinessConfig":
                          { "Enabled": false, "DurationSeconds": null },
                      },
                    "AuthenticateOidcConfig": null,
                    "Order": null,
                    "TargetGroupArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:targetgroup/web/54eedfcacc3949ef",
                    "FixedResponseConfig": null,
                    "AuthenticateCognitoConfig": null,
                    "Type": "forward",
                  },
                ],
              "Port": 443,
              "Certificates":
                [
                  {
                    "IsDefault": null,
                    "CertificateArn": "arn:aws:acm:us-east-1:123456789012:certificate/10c4e713-9bb5-4ccf-aabc-1c9119370038",
                  },
                ],
              "Protocol": "HTTPS",
              "ListenerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:listener/app/web/3ff2fab33a993e0c/995359b182328b77",
              "SslPolicy": "ELBSecurityPolicy-2016-08",
              "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
            },
          ],
        "ResourceId": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
        "Scheme": "internal",
        "VpcId": "vpc-0aa6688dd88484847",
        "State": { "Code": "active", "Reason": null },
        "Name": "web",
        "SSLPolicies":
          {
            "ELBSecurityPolicy-2016-08":
              {
                "Ciphers":
                  [
                    { "Priority": 1, "Name": "ECDHE-ECDSA-AES128-GCM-SHA256" },
                    { "Priority": 2, "Name": "ECDHE-RSA-AES128-GCM-SHA256" },
                    { "Priority": 3, "Name": "ECDHE-ECDSA-AES128-SHA256" },
                    { "Priority": 4, "Name": "ECDHE-RSA-AES128-SHA256" },
                    { "Priority": 5, "Name": "ECDHE-ECDSA-AES128-SHA" },
                    { "Priority": 6, "Name": "ECDHE-RSA-AES128-SHA" },
                    { "Priority": 7, "Name": "ECDHE-ECDSA-AES256-GCM-SHA384" },
                    { "Name": "ECDHE-RSA-AES256-GCM-SHA384", "Priority": 8 },
                    { "Name": "ECDHE-ECDSA-AES256-SHA384", "Priority": 9 },
                    { "Priority": 10, "Name": "ECDHE-RSA-AES256-SHA384" },
                    { "Priority": 11, "Name": "ECDHE-RSA-AES256-SHA" },
                    { "Name": "ECDHE-ECDSA-AES256-SHA", "Priority": 12 },
                    { "Priority": 13, "Name": "AES128-GCM-SHA256" },
                    { "Name": "AES128-SHA256", "Priority": 14 },
                    { "Priority": 15, "Name": "AES128-SHA" },
                    { "Name": "AES256-GCM-SHA384", "Priority": 16 },
                    { "Priority": 17, "Name": "AES256-SHA256" },
                    { "Priority": 18, "Name": "AES256-SHA" },
                  ],
                "SslProtocols": ["TLSv1", "TLSv1.1", "TLSv1.2"],
                "Name": "ELBSecurityPolicy-2016-08",
              },
          },
        "Arn": "arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/web/3ff2fab33a993e0c",
        "Region": "us-east-1",
        "SecurityGroups": ["sg-000bbcc377444490b"],
        "TimeCreated": "2020-03-24T21:39:15.050Z",
        "WebAcl": null,
        "CanonicalHostedZonedId": "Z1H1FL5HABSF5",
        "ResourceType": "AWS.ELBV2.ApplicationLoadBalancer",
      }
  - Name: Observed - No Listeners len() issue
    ExpectedResult: false
    Resource:
      {
        "Listeners": null,
        "Scheme": "internet-facing",
        "SSLPolicies":
          {
            "ELBSecurityPolicy-2016-08":
              {
                "Ciphers":
                  [{ "Priority": 1, "Name": "ECDHE-ECDSA-AES128-GCM-SHA256" }],
                "SslProtocols": ["TLSv1", "TLSv1.1", "TLSv1.2"],
                "Name": "ELBSecurityPolicy-2016-08",
              },
          },
      }
  - Name: TLS 1.3 listeners
    ExpectedResult: true
    Resource:
      {
        "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/tls13/de81aaaa65555555",
        "DNSName": "tls13-46494243.us-west-2.elb.amazonaws.com",
        "CanonicalHostedZoneId": "Z1H1FL5HABSF5",
        "CreatedTime": "2023-04-17T23:46:54.550000+00:00",
        "LoadBalancerName": "tls13",
        "Scheme": "internet-facing",
        "VpcId": "vpc-043e0527f2d6372ea",
        "State": { "Code": "active" },
        "Type": "application",
        "AvailabilityZones":
          [
            {
              "ZoneName": "us-west-2a",
              "SubnetId": "subnet-0a42f65abd22d0d87",
              "LoadBalancerAddresses": [],
            },
            {
              "ZoneName": "us-west-2b",
              "SubnetId": "subnet-0aa42b18abd62e88f",
              "LoadBalancerAddresses": [],
            },
          ],
        "SecurityGroups": ["sg-0197ba84777a5858a"],
        "IpAddressType": "ipv4",
        "Listeners":
          [
            {
              "ListenerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:listener/app/tls13/de81aaaa65555555/5f992ca6d5368214",
              "LoadBalancerArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/tls13/de81aaaa65555555",
              "Port": 443,
              "Protocol": "HTTPS",
              "Certificates":
                [
                  {
                    "CertificateArn": "arn:aws:acm:us-west-2:123456789012:certificate/517cb27d-03fb-4659-96a5-40592b25d977",
                  },
                ],
              "SslPolicy": "ELBSecurityPolicy-TLS13-1-2-2021-06",
              "DefaultActions":
                [
                  {
                    "Type": "forward",
                    "TargetGroupArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/oktgname/67c62d09d6d23288",
                    "ForwardConfig":
                      {
                        "TargetGroups":
                          [
                            {
                              "TargetGroupArn": "arn:aws:elasticloadbalancing:us-west-2:123456789012:targetgroup/oktgname/67c62d09d6d23288",
                              "Weight": 1,
                            },
                          ],
                        "TargetGroupStickinessConfig": { "Enabled": false },
                      },
                  },
                ],
            },
          ],
        "SSLPolicies":
          {
            "ELBSecurityPolicy-TLS13-1-2-2021-06":
              {
                "SslProtocols": ["TLSv1.2", "TLSv1.3"],
                "Ciphers":
                  [
                    { "Name": "TLS_AES_128_GCM_SHA256", "Priority": 1 },
                    { "Name": "TLS_AES_256_GCM_SHA384", "Priority": 2 },
                    { "Name": "TLS_CHACHA20_POLY1305_SHA256", "Priority": 3 },
                    { "Name": "ECDHE-ECDSA-AES128-GCM-SHA256", "Priority": 4 },
                    { "Name": "ECDHE-RSA-AES128-GCM-SHA256", "Priority": 5 },
                    { "Name": "ECDHE-ECDSA-AES128-SHA256", "Priority": 6 },
                    { "Name": "ECDHE-RSA-AES128-SHA256", "Priority": 7 },
                    { "Name": "ECDHE-ECDSA-AES256-GCM-SHA384", "Priority": 8 },
                    { "Name": "ECDHE-RSA-AES256-GCM-SHA384", "Priority": 9 },
                    { "Name": "ECDHE-ECDSA-AES256-SHA384", "Priority": 10 },
                    { "Name": "ECDHE-RSA-AES256-SHA384", "Priority": 11 },
                  ],
                "Name": "ELBSecurityPolicy-TLS13-1-2-2021-06",
                "SupportedLoadBalancerTypes": ["application", "network"],
              },
          },
      }

Detection logic

Condition

Scheme not eq "internal"

This rule also runs imperative logic the parser cannot express as a filter; the conditions above are the structured part it could extract.

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`Scheme`	eq	`internal`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)