CVE-2024-32980
Prior to 2.4.3, some specifically configured Spin applications that use `self` requests without a specified URL authority can be induced to make requests to arbitrary hosts via the `Host` HTTP header.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.49%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Spin is the developer tool for building and running serverless applications powered by WebAssembly. Prior to 2.4.3, some specifically configured Spin applications that use `self` requests without a specified URL authority can be induced to make requests to arbitrary hosts via the `Host` HTTP header. The following conditions need to be met for an application to be vulnerable: 1. The environment Spin is deployed in routes requests to the Spin runtime based on the request URL instead of the `Host` header, and leaves the `Host` header set to its original value; 2. The Spin application's component handling the incoming request is configured with an `allow_outbound_hosts` list containing `"self"`; and 3. In reaction to an incoming request, the component makes an outbound request whose URL doesn't include the hostname/port. Spin 2.4.3 has been released to fix this issue.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.49% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-610
- Source
- security-advisories@github.com
References
- https://github.com/fermyon/spin/commit/b3db535c9edb72278d4db3a201f0ed214e561354
- https://github.com/fermyon/spin/security/advisories/GHSA-f3h7-gpjj-wcvh
- https://github.com/fermyon/spin/commit/b3db535c9edb72278d4db3a201f0ed214e561354
- https://github.com/fermyon/spin/security/advisories/GHSA-f3h7-gpjj-wcvh
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.