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- _____________________________________________________
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- The Computer Incident Advisory Capability
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- _____________________________________________________
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- Information Bulletin
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- February 22, 1991, 1300 PST Number B-14
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- Additional Information about UNIX Security Problem with /bin/mail in SunOS
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- Sun Microsystems has released additional information about the security
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- problem with /bin/mail described in CIAC Bulletin B-13. There are
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- significant changes to the patch installation procedure. The new patch
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- installation procedure is:
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- ________________________________________________________________________
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- Patch ID: 100224-01
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- BugIDs fixed by this patch: 1045636 and 1047340
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- Availability: Anonymous FTP from ftp.uu.net:/sun-dist/100224-01.tar.Z
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- Checksum of the compressed tarfile
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- 100224-01.tar.Z = 64102 109
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- Patches Obsoleted: 100161-01
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- Obsoleted by: SysV Release 4
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- Patch installation instructions are as follows:
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- (Login as root - you must have root access to apply this patch!)
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- (Create a temporary directory and "cd" to it)
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- (Use anonymous FTP to obtain the file sun-dist/100224-01.tar.Z
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- from ftp.uu.net)
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- # uncompress 100224-01.tar
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- # tar xvf 100224-01.tar
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- # mv /bin/mail to /bin/mail.old
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- NEW --> # chmod 400 /bin/mail.old
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- # cp $arch/$os/mail to /bin/mail
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- (where $arch is either sun3 sun4 sun4c or sun3x)
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- (and where $os is either 4.0.3 4.1 or 4.1.1)
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- (change the permissions for the newly installed mail binary)
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- UPDATED --> # chmod 4711 /bin/mail
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- (Sun actually recommends setting the permissions to 4111,
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- but CIAC considers 4711 a wiser choice.)
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- NEW --> # ls -l /bin/mail
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- (Verify that /bin/mail is owned by "root" and the file
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- permissions are correct.)
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- (You will probably wish to delete the 100224-01.tar file and
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- the files created by "de-tar-ing" 100224-01.tar at this time!)
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- ________________________________________________________________________
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- CIAC recommends that you delete /bin/mail.old altogether after
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- verifying that the new version of /bin/mail just installed is
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- functioning correctly. If you take this course of action, you should
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- first make a backup copy of /bin/mail.old and store it off-line.
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- For your information, we have included the Sun addendum below:
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- ________________________________________________________________________
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- This is an addendum to the Security bulletin (#00105) that went out
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- recently. Two points were brought to Sun's attention by the security
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- community.
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- First point: It is not advisable to leave the old version of /bin/mail
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- around as this version can be exploited. After first verifying that the
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- new version was not mangled in the transfer, either remove the old
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- version (/bin/mail.old) or change the permissions to 100. example:
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- chmod 100 /bin/mail.old
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- Second point: The permissions on the new version of /bin/mail do not
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- have to be set to 4755 as they come on the installation tape. setting
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- the mode to 4111 allows /bin/mail to work, but keeps people from
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- reading the binary (with strings)
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- Special Thanks to Gordon O'Connor and Hal Brand for pointing out these
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- flaws in the posting.
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- Brad Powell
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- Sun Microsystems
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- ________________________________________________________________________
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- For additional information or assistance contact:
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- Hal R. Brand
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- (415) 422-6312 or (FTS) 532-6312
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- During working hours, call CIAC at (415) 422-8193 or (FTS)
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- 532-8193. For non-working hour emergencies , call (415)
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- 422-7222 or (FTS) 532-7222 and ask for CIAC (this is a new
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- emergency number).
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- send e-mail to ciac@cheetah.llnl.gov (this is a new Internet
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- address)
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- send FAX messages to: (415) 423-0913 or (FTS) 543-0913
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- Joe Ilacqua and Sun Microsystems provided information contained in this
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- bulletin. Neither the United States Government nor the University of
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- California nor any of their employees, makes any warranty, expressed
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- or implied, or assumes any legal liability or responsibility for the
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- accuracy, completeness, or usefulness of any information, product, or
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- process disclosed, or represents that its use would not infringe
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- privately owned rights. Reference herein to any specific commercial
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- products, process, or service by trade name, trademark manufacturer, or
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- otherwise, does not necessarily constitute or imply its endorsement,
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- recommendation, or favoring by the United States Government or the
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- University of California. The views and opinions of authors expressed
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- herein do not necessarily state or reflect those of the United States
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- Government nor the University of California, and shall not be used for
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- advertising or product endorsement purposes.
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