Improper Path Validation in Git Dependency Handling Allows Arbitrary File System Modification

Improper path validation vulnerability in the Gleam compiler's handling of git dependencies allows arbitrary file system modification during dependency download. Dependency names from gleam.toml and manifest.toml are incorporated into filesystem paths without sufficient validation or confinement to the intended dependency directory, allowing attacker-controlled paths (via relative traversal such as ../ or absolute paths) to target filesystem locations outside that directory. When resolving git dependencies (e.g. via gleam deps download), the computed path is used for filesystem operations including directory deletion and creation. This vulnerability occurs during the dependency resolution and download phase, which is generally expected to be limited to fetching and preparing dependencies within a confined directory. A malicious direct or transitive git dependency can exploit this issue to delete and overwrite arbitrary directories outside the intended dependency directory, including attacker-chosen absolute paths, potentially causing data loss. In some environments, this may be further leveraged to achieve code execution, for example by overwriting git hooks or shell configuration files. This issue affects Gleam from 1.9.0-rc1 until 1.15.4.

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对路径名的限制不恰当(路径遍历)

gleam 安全漏洞

gleam是Gleam开源的一个类型安全的可扩展系统构建语言。 gleam 1.15.3及之前的1.9.0-rc1版本和1.16.0-rc1之前版本存在安全漏洞，该漏洞源于处理git依赖时路径验证不当，可能导致任意文件系统修改。

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