github.com/khulnasoft-lab/defsec@v1.0.5-0.20230827010352-5e9f46893d95/rules/cloud/policies/aws/elb/drop_invalid_headers.go (about)

     1  package elb
     2  
     3  import (
     4  	"github.com/khulnasoft-lab/defsec/internal/rules"
     5  	"github.com/khulnasoft-lab/defsec/pkg/providers"
     6  	"github.com/khulnasoft-lab/defsec/pkg/providers/aws/elb"
     7  	"github.com/khulnasoft-lab/defsec/pkg/scan"
     8  	"github.com/khulnasoft-lab/defsec/pkg/severity"
     9  	"github.com/khulnasoft-lab/defsec/pkg/state"
    10  )
    11  
    12  var CheckDropInvalidHeaders = rules.Register(
    13  	scan.Rule{
    14  		AVDID:      "AVD-AWS-0052",
    15  		Provider:   providers.AWSProvider,
    16  		Service:    "elb",
    17  		ShortCode:  "drop-invalid-headers",
    18  		Summary:    "Load balancers should drop invalid headers",
    19  		Impact:     "Invalid headers being passed through to the target of the load balance may exploit vulnerabilities",
    20  		Resolution: "Set drop_invalid_header_fields to true",
    21  		Explanation: `Passing unknown or invalid headers through to the target poses a potential risk of compromise. 
    22  
    23  By setting drop_invalid_header_fields to true, anything that doe not conform to well known, defined headers will be removed by the load balancer.`,
    24  		Links: []string{
    25  			"https://docs.aws.amazon.com/elasticloadbalancing/latest/application/application-load-balancers.html",
    26  		},
    27  		Terraform: &scan.EngineMetadata{
    28  			GoodExamples:        terraformDropInvalidHeadersGoodExamples,
    29  			BadExamples:         terraformDropInvalidHeadersBadExamples,
    30  			Links:               terraformDropInvalidHeadersLinks,
    31  			RemediationMarkdown: terraformDropInvalidHeadersRemediationMarkdown,
    32  		},
    33  		Severity: severity.High,
    34  	},
    35  	func(s *state.State) (results scan.Results) {
    36  		for _, lb := range s.AWS.ELB.LoadBalancers {
    37  			if lb.Metadata.IsUnmanaged() || !lb.Type.EqualTo(elb.TypeApplication) || lb.Metadata.IsUnmanaged() {
    38  				continue
    39  			}
    40  			if lb.DropInvalidHeaderFields.IsFalse() {
    41  				results.Add(
    42  					"Application load balancer is not set to drop invalid headers.",
    43  					lb.DropInvalidHeaderFields,
    44  				)
    45  			} else {
    46  				results.AddPassed(&lb)
    47  			}
    48  		}
    49  		return
    50  	},
    51  )