Operating System:

Published:

17 August 1999

Protect yourself against future threats.

-----BEGIN PGP SIGNED MESSAGE-----

===========================================================================
              AUSCERT External Security Bulletin Redistribution
                             
                       ESB-1999.116 -- RHSA-1999:028-01
                    Buffer overflow in libtermcap tgetent()
                               18 August 1999

===========================================================================

Red Hat Software, Inc. has released the following advisory concerning a
buffer overflow vulnerability in the tgetent() function of libtermcap.

- --------------------------BEGIN INCLUDED TEXT--------------------

- ---------------------------------------------------------------------
		   Red Hat, Inc. Security Advisory

Synopsis:		Buffer overflow in libtermcap tgetent()
Advisory ID:		RHSA-1999:028-01
Issue date:		1999-08-17
Updated on:		
Keywords:		termcap xterm
Cross references:
- ---------------------------------------------------------------------

1. Topic:

A buffer overflow has been fixed in the tgetent() function of
libtermcap.

2. Bug IDs fixed (http://developer.redhat.com/bugzilla/):

4538

3. Relevant releases/architectures:

Red Hat Linux 4.2, 5.2, 6.0, all architectures

4. Obsoleted by:

5. Conflicts with:

6. RPMs required:

Red Hat Linux 4.2:

Intel:
  ftp://ftp.redhat.com/redhat/updates/4.2/i386/libtermcap-2.0.8-14.4.2.i386.rpm
  ftp://ftp.redhat.com/redhat/updates/4.2/i386/libtermcap-devel-2.0.8-14.4.2.i386.rpm

Alpha:
  ftp://ftp.redhat.com/redhat/updates/4.2/alpha/libtermcap-2.0.8-14.4.2.alpha.rpm
  ftp://ftp.redhat.com/redhat/updates/4.2/alpha/libtermcap-devel-2.0.8-14.4.2.alpha.rpm

Sparc:
  ftp://ftp.redhat.com/redhat/updates/4.2/sparc/libtermcap-2.0.8-14.4.2.sparc.rpm
  ftp://ftp.redhat.com/redhat/updates/4.2/sparc/libtermcap-devel-2.0.8-14.4.2.sparc.rpm

Source packages:
  ftp://ftp.redhat.com/redhat/updates/4.2/SRPMS/libtermcap-2.0.8-14.4.2.src.rpm

Red Hat Linux 5.2:

Intel:
  ftp://ftp.redhat.com/redhat/updates/5.2/i386/libtermcap-2.0.8-14.5.2.i386.rpm
  ftp://ftp.redhat.com/redhat/updates/5.2/i386/libtermcap-devel-2.0.8-14.5.2.i386.rpm

Alpha:
  ftp://ftp.redhat.com/redhat/updates/5.2/alpha/libtermcap-2.0.8-14.5.2.alpha.rpm
  ftp://ftp.redhat.com/redhat/updates/5.2/alpha/libtermcap-devel-2.0.8-14.5.2.alpha.rpm

Sparc:
  ftp://ftp.redhat.com/redhat/updates/5.2/sparc/libtermcap-2.0.8-14.5.2.sparc.rpm
  ftp://ftp.redhat.com/redhat/updates/5.2/sparc/libtermcap-devel-2.0.8-14.5.2.sparc.rpm

Source packages:
  ftp://ftp.redhat.com/redhat/updates/5.2/SRPMS/libtermcap-2.0.8-14.5.2.src.rpm

Red Hat Linux 6.0:

Intel:
  ftp://ftp.redhat.com/redhat/updates/6.0/i386/libtermcap-2.0.8-15.i386.rpm
  ftp://ftp.redhat.com/redhat/updates/6.0/i386/libtermcap-devel-2.0.8-15.i386.rpm

Alpha:
  ftp://ftp.redhat.com/redhat/updates/6.0/alpha/libtermcap-2.0.8-15.alpha.rpm
  ftp://ftp.redhat.com/redhat/updates/6.0/alpha/libtermcap-devel-2.0.8-15.alpha.rpm

Sparc:
  ftp://ftp.redhat.com/redhat/updates/6.0/sparc/libtermcap-2.0.8-15.sparc.rpm
  ftp://ftp.redhat.com/redhat/updates/6.0/sparc/libtermcap-devel-2.0.8-15.sparc.rpm

Source packages:
  ftp://ftp.redhat.com/redhat/updates/6.0/SRPMS/libtermcap-2.0.8-15.src.rpm


7. Problem description:

A buffer overflow existed in libtermcap's tgetent() function,
which could cause the user to execute arbitrary code if they
were able to supply their own termcap file.

Under Red Hat Linux 5.2 and 4.2, this could lead to local users
gaining root privileges, as xterm (as well as other possibly
setuid programs) are linked against libtermcap. Under Red Hat
Linux 6.0, xterm is not setuid root.

Thanks go to Kevin Vajk and the Linux Security Audit team for
noting and providing a fix for this vulnerability.

8. Solution:

For each RPM for your particular architecture, run:
 
rpm -Uvh <filename>
 
where filename is the name of the RPM.

9. Verification:

MD5 sum                           Package Name
- --------------------------------------------------------------------------
31b5612edbb97c66600ac65c81c85fc2  i386/libtermcap-2.0.8-14.4.2.i386.rpm
8c26efd7648e92f23e9d2b5e7f48d3a4  i386/libtermcap-devel-2.0.8-14.4.2.i386.rpm
e6a3cb5ad06d6b64a40321b01d18931b  alpha/libtermcap-2.0.8-14.4.2.alpha.rpm
15c288bd178504542be3b2cee077713a  alpha/libtermcap-devel-2.0.8-14.4.2.alpha.rpm
8fb7ce4743c14b4163c4871dada51b63  sparc/libtermcap-2.0.8-14.4.2.sparc.rpm
bc7a74a44201b37fa6cf3515bd20a2bd  sparc/libtermcap-devel-2.0.8-14.4.2.sparc.rpm
eb117c8f9f926b7fe75f6ebbdf3d2a6b  SRPMS/libtermcap-2.0.8-14.4.2.src.rpm

9811a7c7665a18a46e9c876163628ba6  i386/libtermcap-2.0.8-14.5.2.i386.rpm
91248a539ee5fb708d194403c61ee14c  i386/libtermcap-devel-2.0.8-14.5.2.i386.rpm
50a9dcb2fea451b03b743c46ea478418  alpha/libtermcap-2.0.8-14.5.2.alpha.rpm
a98bbcd7a3e8ab0b41983318aea5e919  alpha/libtermcap-devel-2.0.8-14.5.2.alpha.rpm
4c2f8d832512fabbe5dbcb89fc782159  sparc/libtermcap-2.0.8-14.5.2.sparc.rpm
b65b6267eed90d8149a9e52462b3cf10  sparc/libtermcap-devel-2.0.8-14.5.2.sparc.rpm
19caa6ab708d3a3f6af8eddafb5f53f2  SRPMS/libtermcap-2.0.8-14.5.2.src.rpm

4995cf0a7c181abe56565d82f12c7819  i386/libtermcap-2.0.8-15.i386.rpm
59d18de3f22abe5674575961b1390177  i386/libtermcap-devel-2.0.8-15.i386.rpm
611cdfb7f167242e7d3b2eaac866705a  alpha/libtermcap-2.0.8-15.alpha.rpm
76098235237b5f051ad1266193d7b259  alpha/libtermcap-devel-2.0.8-15.alpha.rpm
846ad7a73b25d3eceab1949322337e14  sparc/libtermcap-2.0.8-15.sparc.rpm
6ddde808ec8b5bc7960851ef3188a6dd  sparc/libtermcap-devel-2.0.8-15.sparc.rpm
6a29851494601540d642ff557bd590d6  SRPMS/libtermcap-2.0.8-15.src.rpm

These packages are PGP signed by Red Hat Inc. for security.  Our key
is available at:
 
http://www.redhat.com/corp/contact.html
 
You can verify each package with the following command:
 
rpm --checksig  <filename>
 
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
 
rpm --checksig --nopgp <filename>

10. References:

- --------------------------END INCLUDED TEXT--------------------

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It will
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key

iQCVAwUBN+dv6Ch9+71yA2DNAQG4fwP/cxMiEdpnWPZANskaVBeiuEIBQUS7eW0f
EWQ90LUnpt68BE8FE1be74p6VsK6sBK6P8lVjf+C2Jvj3WvD04qeIsHBJVJIEUzJ
MKYufPPDs5+c90wRMQm/aZfSoWQH5PKJ2dq2lGuJm5Vgz5NWI6v3jdSU5a2Y1HIs
crPDDkwrn38=
=XarV
-----END PGP SIGNATURE-----