OpenSSH: Permission issue

Background

OpenSSH is a complete SSH protocol implementation that includes SFTP client and server support.

Description

The process_open function in sftp-server.c in OpenSSH did not properly prevent write operations in readonly mode.

Impact

A remote attacker could cause the creation of zero-length files.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSH users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/openssh-7.5_p1-r3"