جزئیات آسیب‌پذیری

SSHFS is a network filesystem client for connecting to SSH servers. From version 1.4 until 3.7.6, SSHFS accepts a bracketed mount source such as [-oProxyCommand=CMD]:/path and find_base_path() removes the brackets, leaving a host value that begins with - and is passed directly to ssh as a command-line argument. When a caller also supplies a path-valued sftp_server, ssh treats the normalized host as an option and the server path as its destination, causing an injected ProxyCommand to execute locally before any connection or authentication succeeds. The attack requires a caller or wrapper that passes an attacker-controlled mount source to SSHFS with the required sftp_server configuration and results in arbitrary command execution as the user running SSHFS. This issue is fixed in version 3.7.6.

• https://github.com/libfuse/sshfs/security/advisories/GHSA-mm85-q63v-4476 x_refsource_CONFIRM
• https://github.com/libfuse/sshfs/pull/362 x_refsource_MISC
• https://github.com/libfuse/sshfs/commit/29bb565ea6405e2dd5a0ea65fe64da117e76055e x_refsource_MISC
• https://github.com/libfuse/sshfs/releases/tag/sshfs-3.7.6 x_refsource_MISC