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CVE-2024-45405 — gix-path improperly resolves configuration path reported by Git

Affected: Byron gitoxide

`gix-path` is a crate of the `gitoxide` project (an implementation of `git` written in Rust) dealing paths and their conversions. Prior to version 0.10.11, `gix-path` runs `git` to find the path of a configuration file associated with the `git` installation, but improperly resolves paths containing unusual or non-ASCII characters, in rare cases enabling a local attacker to inject configuration leading to code execution. Version 0.10.11 contains a patch for the issue.

In `gix_path::env`, the underlying implementation of the `installation_config` and `installation_config_prefix` functions calls `git config -l --show-origin` to find the path of a file to treat as belonging to the `git` installation. Affected versions of `gix-path` do not pass `-z`/`--null` to cause `git` to report literal paths. Instead, to cover the occasional case that `git` outputs a quoted path, they attempt to parse the path by stripping the quotation marks. The problem is that, when a path is quoted, it may change in substantial ways beyond the concatenation of quotation marks. If not reversed, these changes can result in another valid path that is not equivalent to the original.

On a single-user system, it is not possible to exploit this, unless `GIT_CONFIG_SYSTEM` and `GIT_CONFIG_GLOBAL` have been set to unusual values or Git has been installed in an unusual way. Such a scenario is not expected. Exploitation is unlikely even on a multi-user system, though it is plausible in some uncommon configuration…

GHSA-m8rp-vv92-46c7 — gix-path improperly resolves configuration path reported by Git

Affected: crates.io: gix-path

### Summary

`gix-path` runs `git` to find the path of a configuration file associated with the `git` installation, but improperly resolves paths containing unusual or non-ASCII characters, in rare cases enabling a local attacker to inject configuration leading to code execution.

### Details

Affected versions of `gix-path` do not pass `-z`/`--null` to cause `git` to report literal paths ([`650a1b5`](https://github.com/Byron/gitoxide/commit/650a1b5cf25e086197cc55a68525a411e1c28031)). Instead, to cover the occasional case that `git` outputs a quoted path, they attempt to parse the path by stripping the quotation marks:

https://github.com/Byron/gitoxide/blob/1cfe577d461293879e91538dbc4bbfe01722e1e8/gix-path/src/env/git/mod.rs#L138-L142

The problem is that, when a path is quoted, it may change in substantial ways beyond the concatenation of quotation marks. If not reversed, these changes can result in another valid path that is not equivalent to the original.

This is not limited to paths with unusual characters such as quotation marks or newlines. Unless `git` is explicitly configured with `core.quotePath` set to `false`, it also happens when the path contains most non-ASCII characters, including accented or non-English letters. For example, `…