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
⌚ 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 madurity: 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
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
Fixes
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