[ GLSA 200410-28 ] rssh: Format string vulnerability

From: Thierry Carrez (koon_at_gentoo.org)
Date: 10/27/04

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To: gentoo-announce@gentoo.org

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    Gentoo Linux Security Advisory GLSA 200410-28
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                                                http://security.gentoo.org/
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      Severity: High
         Title: rssh: Format string vulnerability
          Date: October 27, 2004
          Bugs: #66988
            ID: 200410-28

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    Synopsis
    ========

    rssh is vulnerable to a format string vulnerability that allows
    arbitrary execution of code with the rights of the connected user,
    thereby bypassing rssh restrictions.

    Background
    ==========

    rssh is a restricted shell, allowing only a few commands like scp or
    sftp. It is often used as a complement to OpenSSH to provide limited
    access to users.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 app-shells/rssh < 2.2.2 >= 2.2.2

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

    Florian Schilhabel from the Gentoo Linux Security Audit Team found a
    format string vulnerability in rssh syslogging of failed commands.

    Impact
    ======

    Using a malicious command, it may be possible for a remote
    authenticated user to execute arbitrary code on the target machine with
    user rights, effectively bypassing any restriction of rssh.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All rssh users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=app-shells/rssh-2.2.2"

    References
    ==========

      [ 1 ] rssh security announcement
            http://www.pizzashack.org/rssh/security.shtml

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

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

      http://security.gentoo.org/glsa/glsa-200410-28.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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