[ GLSA 200405-20 ] Insecure Temporary File Creation In MySQL

From: Thierry Carrez (koon_at_gentoo.org)
Date: 05/25/04

  • Next message: Thierry Carrez: "[Full-Disclosure] [ GLSA 200405-20 ] Insecure Temporary File Creation In MySQL"
    Date: Tue, 25 May 2004 22:47:18 +0200
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    Gentoo Linux Security Advisory GLSA 200405-20
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: Insecure Temporary File Creation In MySQL
          Date: May 25, 2004
          Bugs: #46242
            ID: 200405-20

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    Synopsis
    ========

    Two MySQL utilities create temporary files with hardcoded paths,
    allowing an attacker to use a symlink to trick MySQL into overwriting
    important data.

    Background
    ==========

    MySQL is a popular open-source multi-threaded, multi-user SQL database
    server.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 dev-db/mysql < 4.0.18-r2 >= 4.0.18-r2

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

    The MySQL bug reporting utility (mysqlbug) creates a temporary file to
    log bug reports to. A malicious local user with write access to the
    /tmp directory could create a symbolic link of the name mysqlbug-N
    pointing to a protected file, such as /etc/passwd, such that when
    mysqlbug creates the Nth log file, it would end up overwriting the
    target file. A similar vulnerability exists with the mysql_multi
    utility, which creates a temporary file called mysql_multi.log.

    Impact
    ======

    Since mysql_multi runs as root, a local attacker could use this to
    destroy any other users' data or corrupt and destroy system files.

    Workaround
    ==========

    One could modify both scripts to log to a directory that users do not
    have write permission to, such as /var/log/mysql/.

    Resolution
    ==========

    All users should upgrade to the latest stable version of MySQL.

        # emerge sync

        # emerge -pv ">=dev-db/mysql-4.0.18-r2"
        # emerge ">=dev-db/mysql-4.0.18-r2"

    References
    ==========

      [ 1 ] CAN-2004-0381
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0381
      [ 2 ] CAN-2004-0388
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0388

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

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

         http://security.gentoo.org/glsa/glsa-200405-20.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 Technologies, 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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