Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process.
This issue is fixed in versions 0.1.5 and 2.0.0-beta.5.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c5…
security-advisories@github.com
https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1…
security-advisories@github.com
https://github.com/microsoft/prompty/pull/404
security-advisories@github.com
https://github.com/microsoft/prompty/pull/405
security-advisories@github.com
https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6
security-advisories@github.com
https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5
security-advisories@github.com