Prebid Server is an open-source solution for running real-time advertising auctions in the cloud. Prior to version 4.4.0, certain bidder adapters in Prebid Server interpolate user-supplied parameters into outbound request URLs without properly validating host and subdomain values, allowing crafted bid request parameters to cause server-side requests to unintended destinations and potentially expose internal network services or sensitive server endpoints. This issue is fixed in version 4.4.0.
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 4
https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff…
security-advisories@github.com
https://github.com/prebid/prebid-server/pull/4802
security-advisories@github.com
https://github.com/prebid/prebid-server/releases/tag/v4.4.0
security-advisories@github.com
https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
security-advisories@github.com