rsh security update

ID CESA-2005:165
Type centos
Reporter CentOS Project
Modified 2005-06-08T23:28:58


CentOS Errata and Security Advisory CESA-2005:165

The rsh package contains a set of programs that allow users to run commands on remote machines, login to other machines, and copy files between machines, using the rsh, rlogin, and rcp commands. All three of these commands use rhosts-style authentication.

The rcp protocol allows a server to instruct a client to write to arbitrary files outside of the current directory. This could potentially cause a security issue if a user uses rcp to copy files from a malicious server. The Common Vulnerabilities and Exposures project ( has assigned the name CAN-2004-0175 to this issue.

These updated packages also address the following bugs:

The rlogind server reported "SIGCHLD set to SIG_IGN but calls wait()" message to the system log because the original BSD code was ported incorrectly to linux.

The rexecd server did not function on systems where client hostnames were not in the DNS service, because server code called gethostbyaddr() for each new connection.

The rcp command incorrectly used the "errno" variable and produced erroneous error messages.

The rexecd command ignored settings in the /etc/security/limits file, because the PAM session was incorrectly initialized.

All users of rsh should upgrade to these updated packages, which resolve these issues.

Merged security bulletin from advisories:

Affected packages: rsh rsh-server

Upstream details at: