Summary
A critical OS command injection vulnerability in the Studio Space startup validation script can cause attacker-controlled connection resource properties to be executed by a shell. An authenticated project contributor may use a crafted property to run arbitrary commands in another project member's Studio Space and potentially obtain that member's temporary execution role credentials.
Affected context
The issue affects Amazon SageMaker Distribution environments used with Amazon SageMaker Unified Studio when the Studio Space startup validation script interpolates connection resource properties into a shell command without adequate neutralization. Exploitation depends on a project contributor being able to create or modify a connection resource property that is processed during another member's Studio Space startup.
Exploit preconditions
- Attack surface: Studio Space startup validation and connection resource processing
- Required access: Authentication with project contributor permissions
- Trigger point: Startup or validation of a Studio Space that processes the crafted connection property
- Target context: Another project member's Studio Space
- Why exploitation is possible: Attacker-controlled data is interpolated into a shell invocation without sufficient command-separator or metacharacter neutralization
Why this happens
The vulnerability results from constructing a shell command with data derived from a connection resource property without treating that data as untrusted input.
When attacker-controlled values are concatenated into a shell invocation, shell syntax may be interpreted as executable commands rather than as ordinary data. This behavior maps to CWE-78: Improper Neutralization of Special Elements used in an OS Command, commonly known as OS command injection.
Potential impact
- An attacker may execute arbitrary commands within another member's Studio Space
- The attacker could access data, files, or processes available to the Studio Space
- Temporary execution role credentials may be exposed
- Compromised credentials could enable unauthorized access to permitted cloud resources
- The affected project or connected workloads could experience data manipulation or disruption
General mitigation guidance
Mitigation typically focuses on removing shell interpretation from application workflows and reducing trust in resource properties.
Common defensive patterns include:
- Prefer direct process-execution APIs that pass arguments separately instead of invoking a shell
- Apply strict allowlists and schema validation to connection resource properties
- Treat all project-supplied resource metadata as untrusted, including values from authenticated contributors
- Use context-appropriate escaping only as a secondary defense where shell execution cannot be eliminated
- Run startup validation with the minimum filesystem, network, and cloud permissions required
- Limit exposure and lifetime of temporary execution credentials
- Ensure supported runtime images receive security fixes through controlled deployment and restart processes
How teams detect issues like this
Organizations can look for this weakness through:
- Static analysis rules identifying string concatenation, interpolation, or formatting used to build shell commands
- Code review checks for shell invocations that consume connection metadata or other user-controlled properties
- Tests using benign metacharacter and separator inputs to verify that values remain data rather than commands
- Runtime monitoring for unexpected child processes, shell launches, or command execution during Studio Space startup
- Audit policies that flag unusual use of temporary execution role credentials or access from unexpected Studio Spaces
- Automated security review tools that identify command-construction patterns and missing input validation
