CVE-2024-28110
Go SDK for CloudEvents's use of WithRoundTripper to create a Client leaks credentials
Impact
### Impact _What kind of vulnerability is it? Who is impacted?_ Using cloudevents.WithRoundTripper to create a cloudevents.Client with an authenticated http.RoundTripper causes the go-sdk to leak credentials to arbitrary endpoints. The relevant code is [here](https://github.com/cloudevents/sdk-go/blob/67e389964131d55d65cd14b4eb32d57a47312695/v2/protocol/http/protocol.go#L104-L110) (also inline, emphasis added): <pre>if p.Client == nil { p.Client = **http.DefaultClient** } if p.roundTripper != nil { p.Client.**Transport = p.roundTripper** } </pre> When the transport is populated with an authenticated transport such as: - [oauth2.Transport](https://pkg.go.dev/golang.org/x/oauth2#Transport) - [idtoken.NewClient(...).Transport](https://pkg.go.dev/google.golang.org/api/idtoken#NewClient) ... then http.DefaultClient is modified with the authenticated transport and will start to send Authorization tokens to **any endpoint** it is used to contact! Found and patched by: @tcnghia and @mattmoor ### Patches v.2.15.2
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/cloudevents/sdk-go/v2 | <= 2.15.1 | 2.15.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cloudevents | Go Sdk | through 2.15.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/cloudevents/sdk-go/blob/67e389964131d55d65cd14b4eb32d57a47312695/v2/protocol/http/protocol.go#L104-L110
- https://github.com/cloudevents/sdk-go/commit/de2f28370b0d2a0f64f92c0c6139fa4b8a7c3851
- https://github.com/cloudevents/sdk-go/security/advisories/GHSA-5pf6-2qwx-pxm2
- https://github.com/advisories/GHSA-5pf6-2qwx-pxm2