[ GLSA 200411-15 ] OpenSSL, Groff: Insecure tempfile handling

From: Thierry Carrez (koon_at_gentoo.org)
Date: 11/08/04

  • Next message: Timo Sirainen: "up-imapproxy DoS vulnerabilities" 
    Date: Mon, 08 Nov 2004 11:37:24 +0100
To: gentoo-announce@gentoo.org

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    Gentoo Linux Security Advisory GLSA 200411-15
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: OpenSSL, Groff: Insecure tempfile handling
          Date: November 08, 2004
          Bugs: #68404, #68407
            ID: 200411-15

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    Synopsis
    ========

    groffer, included in the Groff package, and the der_chop script,
    included in the OpenSSL package, are both vulnerable to symlink
    attacks, potentially allowing a local user to overwrite arbitrary
    files with the rights of the user running the utility.

    Background
    ==========

    OpenSSL is a toolkit implementing the Secure Sockets Layer and
    Transport Layer Security protocols as well as a general-purpose
    cryptography library. It includes the der_chop script, which is used to
    convert DER-encoded certificates to PEM format. Groff (GNU Troff) is a
    typesetting package which reads plain text mixed with formatting
    commands and produces formatted output. It includes groffer, a command
    used to display groff files and man pages on X and tty.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 dev-libs/openssl < 0.9.7d-r2 >= 0.9.7d-r2
      2 sys-apps/groff < 1.19.1-r2 >= 1.19.1-r2
        -------------------------------------------------------------------
         2 affected packages on all of their supported architectures.
        -------------------------------------------------------------------

    Description
    ===========

    groffer and the der_chop script create temporary files in
    world-writeable directories with predictable names.

    Impact
    ======

    A local attacker could create symbolic links in the temporary files
    directory, pointing to a valid file somewhere on the filesystem. When
    groffer or der_chop is executed, this would result in the file being
    overwritten with the rights of the user running the utility, which
    could be the root user.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All Groff users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=sys-apps/groff-1.19.1-r2"

    All OpenSSL users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.7d-r2"

    Note: /etc/ssl/misc/der_chop is protected by Portage as a configuration
    file. Don't forget to use etc-update and overwrite the old version with
    the new one.

    References
    ==========

      [ 1 ] CAN-2004-0969
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0969
      [ 2 ] CAN-2004-0975
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0975

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200411-15.xml

    Concerns?
    =========

    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users machines is of utmost
    importance to us. Any security concerns should be addressed to
    security@gentoo.org or alternatively, you may file a bug at
    http://bugs.gentoo.org.

    License
    =======

    Copyright 2004 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/1.0

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