DG/UX ospf_monitor vulnerability

Description:It is suid and contains a command to write to file, which it does w/o dropping privileges. Brilliant.
Author:Brian Mitchell (brian@saturn.net)
Compromise: root (local)
Vulnerable Systems:Tested on DG/UX 5.4r3.10
Date:23 July 1996


From: Brian Mitchell (brian@saturn.net)
Date: Tue, 23 Jul 1996 19:03:07 -0400 

There seems to be a vulnerbility in dg/ux (tested in 5.4r3.10) - it
includes ospf_monitor (from the gated package). Unfortunately, it is a
older version and has a security hole.

It is a suid program, and has a command to write to a file, so something
like this:

umask 0
F /tmp/foo

This should create a 0 byte world writable file called /tmp/foo, assuming
/tmp/foo does not exist. If it exists, it will be truncated, permissions
obviously will not be modified.

Brian Mitchell                                          brian@saturn.net
"I never give them hell. I just tell the truth and they think it's hell"
- H. Truman

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