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# AWS CloudFront attached WAFv2 WebACL is not configured with AMR for Log4j Vulnerability misconfigura

## AWS CloudFront attached WAFv2 WebACL is not configured with AMR for Log4j Vulnerability misconfiguration detected in code

### Rule Details

|                        |                                      |
| ---------------------- | ------------------------------------ |
| Cortex AppSec Rule ID  | APPSEC2\_AWS\_47                     |
| Category - Subcategory | Public Exposure - APIs               |
| Provider               | AWS                                  |
| Severity               | MEDIUM                               |
| Framework              | Terraform                            |
| Mapped CSPM/KSPM Rule  | c8bbb7a9-c13a-482b-a0f3-96b4f5ff2ce0 |

### Impact

This rule identifies AWS CloudFront attached with WAFv2 WebACL which is not configured with AWS Managed Rules (AMR) for Log4j Vulnerability. As per the guidelines given by AWS, CloudFront attached with WAFv2 WebACL should be configured with AWS Managed Rules (AMR) AWSManagedRulesKnownBadInputsRuleSet and AWSManagedRulesAnonymousIpList to protect from Log4j Vulnerability (CVE-2021-44228).

For more information please refer to <https://aws.amazon.com/security/security-bulletins/AWS-2021-006/>

### How to Fix

*Resource:* aws\_cloudfront\_distribution, aws\_wafv2\_web\_acl

* *Arguments:* rule.statement.managed\_rule\_group\_statement.name \[source,go]

***

resource "aws\_cloudfront\_distribution" "pass" { origin { domain\_name = aws\_s3\_bucket.b.bucket\_regional\_domain\_name origin\_access\_control\_id = aws\_cloudfront\_origin\_access\_control.default.id origin\_id = local.s3\_origin\_id }

enabled = true is\_ipv6\_enabled = true comment = "Some comment" default\_root\_object = "index.html"

aliases = \["mysite.example.com", "yoursite.example.com"]

default\_cache\_behavior { allowed\_methods = \["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"] cached\_methods = \["GET", "HEAD"] target\_origin\_id = local.s3\_origin\_id

forwarded\_values { query\_string = false

cookies { forward = "none" } }

viewer\_protocol\_policy = "allow-all" min\_ttl = 0 default\_ttl = 3600 max\_ttl = 86400 }

## Cache behavior with precedence 0

ordered\_cache\_behavior { path\_pattern = "/content/immutable/\*" allowed\_methods = \["GET", "HEAD", "OPTIONS"] cached\_methods = \["GET", "HEAD", "OPTIONS"] target\_origin\_id = local.s3\_origin\_id

forwarded\_values { query\_string = false headers = \["Origin"]

cookies { forward = "none" } }

min\_ttl = 0 default\_ttl = 86400 max\_ttl = 31536000 compress = true viewer\_protocol\_policy = "redirect-to-https" }

price\_class = "PriceClass\_200"

restrictions { geo\_restriction { restriction\_type = "whitelist" locations = \["US", "CA", "GB", "DE"] } }

tags = { Environment = "production" }

viewer\_certificate { cloudfront\_default\_certificate = true } web\_acl\_id = aws\_wafv2\_web\_acl.pass\_acl.arn }

resource "aws\_wafv2\_web\_acl" "pass\_acl" { name = "managed-rule-example" description = "Example of a managed rule." scope = "REGIONAL"

default\_action { allow {} }

rule { name = "rule-1" priority = 1

override\_action { count {} }

statement { managed\_rule\_group\_statement { name = "AWSManagedRulesAnonymousIpList" vendor\_name = "AWS"

excluded\_rule { name = "SizeRestrictions\_QUERYSTRING" }

scope\_down\_statement { geo\_match\_statement { country\_codes = \["US", "NL"] } } } }

visibility\_config { cloudwatch\_metrics\_enabled = false metric\_name = "friendly-rule-metric-name" sampled\_requests\_enabled = false } }

rule { name = "rule-2" priority = 2

override\_action { count {} }

statement { managed\_rule\_group\_statement { name = "AWSManagedRulesKnownBadInputsRuleSet" vendor\_name = "AWS"

excluded\_rule { name = "SizeRestrictions\_QUERYSTRING" }

scope\_down\_statement { geo\_match\_statement { country\_codes = \["US", "NL"] } } } }

visibility\_config { cloudwatch\_metrics\_enabled = false metric\_name = "friendly-rule-metric-name" sampled\_requests\_enabled = false } }

tags = { Tag1 = "Value1" Tag2 = "Value2" }

### visibility\_config { cloudwatch\_metrics\_enabled = false metric\_name = "friendly-metric-name" sampled\_requests\_enabled = false } }


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