Supply Chain Attack - Terraform

Description

Terraform dependencies are not pinned, allowing a malicious actor to override the used components with malicious components without leaving a trace.

Impact

Override dependencies or component with malicious content.

Recommendation

Use mechanisms such as git-commits, or artifacts and hashes to verify the data integrity.

Threat

Anonymous attacker from Internet with write access to the provider releases.

Expected Remediation Time

⌚ 15 minutes.

Score

Default score using CVSS 3.1. It may change depending on the context of the src.

Base

Attack vector: N
Attack complexity: H
Privileges required: N
User interaction: R
Scope: U
Confidentiality: N
Integrity: L
Availability: N

Temporal

Exploit code maturity: U
Remediation level: O
Report confidence: R

Result

Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:R
Score:

Base: 3.1
Temporal: 2.6

Severity:

Base: Low
Temporal: Low

Score 4.0

Default score using CVSS 4.0. It may change depending on the context of the src.

Base 4.0

Attack vector: N
Attack complexity: H
Attack Requirements: N
Privileges required: N
User interaction: P
Confidentiality (VC): N
Integrity (VI): L
Availability (VA): N
Confidentiality (SC): N
Integrity (SI): N
Availability (SA): N

Threat 4.0

Exploit maturity: U

Result 4.0

Vector string: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Score:

CVSS-BT: 0.6

Severity:

CVSS-BT: Low

Compliant code

All terraform dependencies are pinned

                required_providers {
  aws = {
    source  = "github.com/hashicorp/example"
    version = "3.23.0"
  }
}

Non compliant code

There are unpinned terraform dependencies

                required_providers {
  aws = {
    source  = "hashicorp/aws"
    version = "~> 3.23.0"
  }
}

Details

Why

Terraform providers are installed as:

                required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.23.0"
    }
    cloudflare = {
      source  = "cloudflare/cloudflare"
      version = "~> 2.20.0"
    }
  }

not only they are not pinned, but also a version like 2.20.0 has no guarantees because a malicious actor with access to the provider release process can override tags with malicious content, changing the legit 2.20.0 for malicious 2.20.0 without us noticing

Requirements

266.Disable insecure functionalities

Fixes

Free trial

Search for vulnerabilities in your apps for free with Fluid Attacks' automated security testing! Start your 21-day free trial and discover the benefits of the Continuous Hacking Essential plan. If you prefer the Advanced plan, which includes the expertise of Fluid Attacks' hacking team, fill out this contact form.