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OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.html http://www.openpkg.org
openpkg-security@openpkg.org openpkg@openpkg.org
OpenPKG-SA-2003.050 28-Nov-2003
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Package: screen
Vulnerability: privilege escalation
OpenPKG Specific: no
Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT <= screen-4.0.1-20031009>= screen-4.0.1-20031127
OpenPKG 1.3 <= screen-3.9.15-1.3.0>= screen-3.9.15-1.3.1
OpenPKG 1.2 <= screen-3.9.13-1.2.0>= screen-3.9.13-1.2.1
Dependent Packages: none
Description:
Timo Sirainen reported and fixed [1] a buffer overflow bug which
allows privilege escalation in the Virtual Screen Manager GNU screen
[2], whose executable is installed setuid-root. It also has some
potential for attackers getting control of another user's screen.
Transfer of approximately two gigabytes of data is required to exploit
this vulnerability.
Please check whether you are affected by running "/bin/rpm -q
screen". If you have the "screen" package installed and its version
is affected (see above), we recommend that you immediately upgrade it
(see Solution). [3][4]
Solution:
Select the updated source RPM appropriate for your OpenPKG release
[5][6], fetch it from the OpenPKG FTP service [7][8] or a mirror
location, verify its integrity [9], build a corresponding binary RPM
from it [3] and update your OpenPKG installation by applying the
binary RPM [4]. For the current release OpenPKG 1.3, perform the
following operations to permanently fix the security problem (for
other releases adjust accordingly).
$ ftp ftp.openpkg.org
ftp> bin
ftp> cd release/1.3/UPD
ftp> get screen-3.9.15-1.3.1.src.rpm
ftp> bye
$ /bin/rpm -v --checksig screen-3.9.15-1.3.1.src.rpm
$ /bin/rpm --rebuild screen-3.9.15-1.3.1.src.rpm
$ su -
# /bin/rpm -Fvh /RPM/PKG/screen-3.9.15-1.3.1.*.rpm
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References:
[1] http://www.securityfocus.com/archive/1/345844/2003-11-24/2003-11-30 /0
[2] http://www.gnu.org/software/screen/
[3] http://www.openpkg.org/tutorial.html#regular-source
[4] http://www.openpkg.org/tutorial.html#regular-binary
[5] ftp://ftp.openpkg.org/release/1.2/UPD/screen-3.9.13-1.2.1.src.rpm
[6] ftp://ftp.openpkg.org/release/1.3/UPD/screen-3.9.15-1.3.1.src.rpm
[7] ftp://ftp.openpkg.org/release/1.2/UPD/
[8] ftp://ftp.openpkg.org/release/1.3/UPD/
[9] http://www.openpkg.org/security.html#signature
________________________________________________________________________
For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG " (ID 63C4CB9F) of the
OpenPKG project which you can retrieve from http://pgp.openpkg.org and
hkp://pgp.openpkg.org. Follow the instructions on http://pgp.openpkg.org/
for details on how to verify the integrity of this advisory.
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