OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. Thesepackages include the core files necessary for both the OpenSSH client andserver.A Red Hat specific patch used in the openssh packages as shipped in RedHat Enterprise Linux 5.4 (RHSA-2009:1287) loosened certain ownershiprequirements for directories used as arguments for the ChrootDirectoryconfiguration options. A malicious user that also has or previously hadnon-chroot shell access to a system could possibly use this flaw toescalate their privileges and run commands as any system user.(CVE-2009-2904)All OpenSSH users are advised to upgrade to these updated packages, whichcontain a backported patch to resolve this issue. After installing thisupdate, the OpenSSH server daemon (sshd) will be restarted automatically.