Originally Published: Thursday, 19 August 1999 Author: Quentin Cregan
Published to: news_enhance_security/Security News Page: 1/1 - [Printable]

RHSA-1999:028-01 libtermcap problem fixed

A buffer overflow problem has been found and fixed in the tgetent() function of libtermcap. RedHat 4.2/5.2/6.0 (all archs) are affected.

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--------------------------------------------------------------------- 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

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

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

10. References:





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