Atlantis through 0.47.1 fails to authenticate the /github-app/setup endpoint, allowing unauthenticated attackers to access GitHub App credentials. Attackers can observe or intercept the GitHub redirect during setup to obtain the RSA private key and webhook secret, enabling installation token minting and webhook payload forgery.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/runatlantis/atlantis
disclosure@vulncheck.com
https://github.com/runatlantis/atlantis/blob/12bfa59f44d8f65bfdda132bff61d8f8f2…
disclosure@vulncheck.com
https://github.com/runatlantis/atlantis/blob/12bfa59f44d8f65bfdda132bff61d8f8f2…
disclosure@vulncheck.com
https://github.com/runatlantis/atlantis/issues/6622
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/atlantis-github-app-setup-endpoint-returns…
disclosure@vulncheck.com