Description (CNA)
AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.0, AsyncSSH expands the OpenSSH-compatible AuthorizedKeysFile %u token in asyncssh/config.py, asyncssh/connection.py, asyncssh/auth_keys.py, and asyncssh/misc.py with the raw SSH username during pre-authentication server config reload, allowing a server configured with AuthorizedKeysFile authorized_keys/%u to read an authorized-keys file outside the intended directory when the SSH username contains /, \, or .. path traversal segments and authenticate with an attacker-selected key file. This issue is fixed in version 2.23.0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| ronf / asyncssh | affected < 2.23.0 |
CWE
CWE-22
References
- https://github.com/ronf/asyncssh/security/advisories/GHSA-g794-3fmp-753h
- https://github.com/ronf/asyncssh/commit/2af2382cce946c959a378a62f257af253dc4ab51
- https://github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88
ADP enrichment
No English description supplied.