Bug 2503668

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in libssh client-side ProxyCommand handling. In ssh_socket_connect_proxycommand() in src/socket.c, the return value of fork() was not checked before being stored as the proxy child PID. If fork() fails, the value -1 can be retained in state and later used during cleanup, causing signals to be sent across the caller's accessible process tree. In deployments that use ProxyCommand, this can lead to local denial of service.