[Full-Disclosure] [OpenPKG-SA-2003.050] OpenPKG Security Advisory (screen)

From: OpenPKG (openpkg_at_openpkg.org)
Date: 11/28/03

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Date: Fri, 28 Nov 2003 13:23:13 +0100

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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
    ________________________________________________________________________

    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 "<prefix>/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
      $ <prefix>/bin/rpm -v --checksig screen-3.9.15-1.3.1.src.rpm
      $ <prefix>/bin/rpm --rebuild screen-3.9.15-1.3.1.src.rpm
      $ su -
      # <prefix>/bin/rpm -Fvh <prefix>/RPM/PKG/screen-3.9.15-1.3.1.*.rpm
    ________________________________________________________________________

    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 <openpkg@openpkg.org>" (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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