act is a project which allows for local running of github actions. The artifact server that stores artifacts from Github Action runs does not sanitize path inputs. This allows an attacker to download and overwrite arbitrary files on the host from a Github Action. This issue may lead to privilege escalation. The /upload endpoint is vulnerable to path traversal as filepath is user controlled, and ultimately flows into os.Mkdir and os.Open. The /artifact endpoint is vulnerable to path traversal as the path is variable is user controlled, and the specified file is ultimately returned by the server. This has been addressed in version 0.2.40. Users are advised to upgrade. Users unable to upgrade may, during implementation of Open and OpenAtEnd for FS, ensure to use ValidPath() to check against path traversal or clean the user-provided paths manually.
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
| Link | Tags |
|---|---|
| https://github.com/nektos/act/security/advisories/GHSA-pc99-qmg4-rcff | third party advisory exploit |
| https://github.com/nektos/act/issues/1553 | third party advisory issue tracking |
| https://github.com/nektos/act/commit/63ae215071f94569d910964bdee866d91d6e3a10 | third party advisory patch |
| https://github.com/nektos/act/blob/master/pkg/artifacts/server.go#L65 | third party advisory |
| https://github.com/nektos/act/blob/v0.2.35/pkg/artifacts/server.go#L245 | third party advisory |
| https://github.com/nektos/act/blob/v0.2.35/pkg/artifacts/server.go#LL103C2-L103C2 | third party advisory |
| https://securitylab.github.com/advisories/GHSL-2023-004_act/ | third party advisory exploit |