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Security Advisory Low: brltty security and bug fix update

Advisory: RHSA-2010:0181-5
Type: Security Advisory
Severity: Low
Issued on: 2010-03-30
Last updated on: 2010-03-30
Affected Products: RHEL Desktop Workstation (v. 5 client)
Red Hat Enterprise Linux (v. 5 server)
Red Hat Enterprise Linux Desktop (v. 5 client)
CVEs (cve.mitre.org): CVE-2008-3279

Details

Updated brltty packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

brltty (Braille TTY) is a background process (daemon) which provides access
to the Linux console (when in text mode) for a blind person using a
refreshable braille display. It drives the braille display, and provides
complete screen review functionality.

It was discovered that a brltty library had an insecure relative RPATH
(runtime library search path) set in the ELF (Executable and Linking
Format) header. A local user able to convince another user to run an
application using brltty in an attacker-controlled directory, could run
arbitrary code with the privileges of the victim. (CVE-2008-3279)

These updated packages also provide fixes for the following bugs:

* the brltty configuration file is documented in the brltty manual page,
but there is no separate manual page for the /etc/brltty.conf configuration
file: running "man brltty.conf" returned "No manual entry for brltty.conf"
rather than opening the brltty manual entry. This update adds brltty.conf.5
as an alias to the brltty manual page. Consequently, running "man
brltty.conf" now opens the manual entry documenting the brltty.conf
specification. (BZ#530554)

* previously, the brltty-pm.conf configuration file was installed in the
/etc/brltty/ directory. This file, which configures Papenmeier Braille
Terminals for use with Red Hat Enterprise Linux, is optional. As well, it
did not come with a corresponding manual page. With this update, the file
has been moved to /usr/share/doc/brltty-3.7.2/BrailleDrivers/Papenmeier/.
This directory also includes a README document that explains the file's
purpose and format. (BZ#530554)

* during the brltty packages installation, the message

Creating screen inspection device /dev/vcsa...done.

was presented at the console. This was inadequate, especially during the
initial install of the system. These updated packages do not send any
message to the console during installation. (BZ#529163)

* although brltty contains ELF objects, the brltty-debuginfo package was
empty. With this update, the -debuginfo package contains valid debugging
information as expected. (BZ#500545)

* the MAX_NR_CONSOLES definition was acquired by brltty by #including
linux/tty.h in Programs/api_client.c. MAX_NR_CONSOLES has since moved to
linux/vt.h but the #include in api_client.c was not updated. Consequently,
brltty could not be built from the source RPM against the Red Hat
Enterprise Linux 5 kernel. This update corrects the #include in
api_client.c to linux/vt.h and brltty now builds from source as expected.
(BZ#456247)

All brltty users are advised to upgrade to these updated packages, which
resolve these issues.


Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Updated packages

RHEL Desktop Workstation (v. 5 client)

SRPMS:
brltty-3.7.2-4.el5.src.rpm     MD5: 914f1f83e33cbcfe4b185ca034970537
SHA-256: d426e8d23706300a7aefb352f9ca8a7fd2be21756ed21766c00935ea00715f47
 
IA-32:
brlapi-devel-0.4.1-4.el5.i386.rpm     MD5: 5f84982f2dab821451cde3dee43e1716
 
x86_64:
brlapi-devel-0.4.1-4.el5.i386.rpm     MD5: 5f84982f2dab821451cde3dee43e1716
brlapi-devel-0.4.1-4.el5.x86_64.rpm     MD5: 1b387fb3aeaca37d26673183a88c0838
 
Red Hat Enterprise Linux (v. 5 server)

SRPMS:
brltty-3.7.2-4.el5.src.rpm     MD5: 914f1f83e33cbcfe4b185ca034970537
SHA-256: d426e8d23706300a7aefb352f9ca8a7fd2be21756ed21766c00935ea00715f47
 
IA-32:
brlapi-0.4.1-4.el5.i386.rpm     MD5: 6b6bac2d8de40d0075e615e043db406f
brlapi-devel-0.4.1-4.el5.i386.rpm     MD5: 5f84982f2dab821451cde3dee43e1716
brltty-3.7.2-4.el5.i386.rpm     MD5: c1a19728d491b991ddfc8bc79c259289
 
IA-64:
brlapi-0.4.1-4.el5.ia64.rpm     MD5: 4e201a955442648f0e2fd1a31d95db70
brlapi-devel-0.4.1-4.el5.ia64.rpm     MD5: f61fe06c8a0a899e950a555e78d37097
brltty-3.7.2-4.el5.ia64.rpm     MD5: c1ba3b6a372082b4d577b682365ab1be
 
PPC:
brlapi-0.4.1-4.el5.ppc.rpm     MD5: ec839cb3145dc8f01c68abadac4cd2f1
brlapi-0.4.1-4.el5.ppc64.rpm     MD5: aecf51f7be654642827d0749c387a8f6
brlapi-devel-0.4.1-4.el5.ppc.rpm     MD5: 2a0edea89c6e200ee0269760ad226228
brlapi-devel-0.4.1-4.el5.ppc64.rpm     MD5: 1a482adc2fadf577085bb0d35cf4a5f1
brltty-3.7.2-4.el5.ppc.rpm     MD5: 706d3a4807c7d24781d0aa206ec65e1b
 
s390x:
brlapi-0.4.1-4.el5.s390.rpm     MD5: 5ab623f2e80409eecb0e6498cce260dd
brlapi-0.4.1-4.el5.s390x.rpm     MD5: d77db32b57daaa19482cbee51deb9244
brlapi-devel-0.4.1-4.el5.s390.rpm     MD5: 857841fa680d4b02a6529ce62d0a6177
brlapi-devel-0.4.1-4.el5.s390x.rpm     MD5: ffab9139493040c41f7861730a273840
brltty-3.7.2-4.el5.s390x.rpm     MD5: 09688b5bf173742a8f56b0ab60335203
 
x86_64:
brlapi-0.4.1-4.el5.i386.rpm     MD5: 6b6bac2d8de40d0075e615e043db406f
brlapi-0.4.1-4.el5.x86_64.rpm     MD5: 217d7f9c66ca18a33d2f8a4adcdc281f
brlapi-devel-0.4.1-4.el5.i386.rpm     MD5: 5f84982f2dab821451cde3dee43e1716
brlapi-devel-0.4.1-4.el5.x86_64.rpm     MD5: 1b387fb3aeaca37d26673183a88c0838
brltty-3.7.2-4.el5.x86_64.rpm     MD5: a42f37316448f1d4dbb6ab556e4ddadc
 
Red Hat Enterprise Linux Desktop (v. 5 client)

SRPMS:
brltty-3.7.2-4.el5.src.rpm     MD5: 914f1f83e33cbcfe4b185ca034970537
SHA-256: d426e8d23706300a7aefb352f9ca8a7fd2be21756ed21766c00935ea00715f47
 
IA-32:
brlapi-0.4.1-4.el5.i386.rpm     MD5: 6b6bac2d8de40d0075e615e043db406f
brltty-3.7.2-4.el5.i386.rpm     MD5: c1a19728d491b991ddfc8bc79c259289
 
x86_64:
brlapi-0.4.1-4.el5.i386.rpm     MD5: 6b6bac2d8de40d0075e615e043db406f
brlapi-0.4.1-4.el5.x86_64.rpm     MD5: 217d7f9c66ca18a33d2f8a4adcdc281f
brltty-3.7.2-4.el5.x86_64.rpm     MD5: a42f37316448f1d4dbb6ab556e4ddadc
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

456247 - brltty doesn't build with kernel 2.6.18-92.1.1
457942 - CVE-2008-3279 brltty: insecure relative RPATH
500545 - brltty-debuginfo is empty
529163 - Creating screen inspection device /dev/vcsa...done.
530554 - Missing man-pages


References



These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:
https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/