Re: XWindows service on IBM i

On Thu, Apr 21, 2016 at 3:10 PM, Buck Calabro <kc2hiz@xxxxxxxxx> wrote:

On 4/21/2016 2:55 PM, Justin Dearing wrote:

Pretty rexec is part of rsh, unencrypted ssh. Don't use it. Password
transmitted in plain text.

This is a shut it of and see if people complain kind of thing because it's
unpopular and insecure. I don't blame your auditors getting upset at this.

CVE-1999-0526
CVSS v2 Base Score: 10.0 HIGH
See also: http://www.kb.cert.org/vuls/id/704969

I might get upset about rexec too, but the link points to X11 /
XWindows. Rexec isn't X11, is it? Is the CVE some confusion over port
numbers?

Right. It looks like either Rob or the auditors (or maybe both) have
had some kind of misunderstanding. X11 (formally the X Window System)
is unrelated to rexec or RUNRMTCMD. (Based on the link provided by
Chris, I think RUNRMTCMD *is* the midrange incarnation of Unix's
rexec, because they use the same commonly recognized port, and they
provide the same or very similar functionality.)

I can't say which is the "real" issue, but I can say with confidence
that RUNRMTCMD is discussed in these midrange lists far more often
than X11 is. And rexec is inherently insecure, whereas X11 can be used
in conjunction with SSH.

John Y.