CERT_RCP_Advisory

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1 total messages Started by CERT Advisory Fri, 27 Oct 1989 01:25

Author: CERT Advisory
Date: Fri, 27 Oct 1989 01:25

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			    CERT Advisory

			   October 26, 1989

			Sun RCP vulnerability


 
A problem has been discovered in the SunOS 4.0.x rcp.  If exploited,
this problem can allow users of other trusted machines to execute
root-privilege commands on a Sun via rcp.

This affects only SunOS 4.0.x systems; 3.5 systems are not affected.

A Sun running 4.0.x rcp can be exploited by any other trusted host
listed in /etc/hosts.equiv or /.rhosts.  Note that the other machine
exploiting this hole does not have to be running Unix; this
vulnerability can be exploited by a PC running PC/NFS, for example.

This bug will be fixed by Sun in version 4.1 (Sun Bug number 1017314),
but for now the following workaround is suggested by Sun:

Change the 'nobody' /etc/passwd file entry from

nobody:*:-2:-2::/:

to

nobody:*:32767:32767:Mismatched NFS ID's:/nonexistant:/nosuchshell


If you need further information about this problem, please contact
CERT by electronic mail or phone.


J. Paul Holbrook
Computer Emergency Response Team (CERT)
Carnegie Mellon University
Software Engineering Institute

Internet: <cert@SEI.CMU.EDU>
(412) 268-7090 (24 hour hotline)

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