Articles / SuSE: remote command execut…

SuSE: remote command execution in radiusd-cistron

The radius daemon as shipped with the radiusd-cistron package is responsible for the RADIUS authentication service in networks and therefore considered a security critical application. ZARAZA reported security releated bugs in various radius server and client software. The list of vulnerable servers includes the cistron radius package. Within the cistron package, a buffer overflow in the digest calculation function and miscalculations of attribute lengths have been fixed which could allow remote attackers to execute arbitrary commands on the system running the radius server. Beside the cistron radius package the following radius packages have been vulnerable to the same attacks and have been fixed: freeradius, radiusclient and livingston-radius. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                radiusd-cistron
        Announcement-ID:        SuSE-SA:2002:013
        Date:                   Mon Apr 29 13:00:00 CEST 2002
        Affected products:      6.4, 7.0, 7.1, 7.2, 7.3,
                                Enterprise Server 7
        Vulnerability Type:     remote command execution
        Severity (1-10):        7
        SuSE default package:   No
        Other affected systems: Various radius clients and servers.

    Content of this advisory:
        1) security vulnerability resolved: digest calculation buffer overflow,
           invalid attribute length calculation
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds
        3) standard appendix (further information)

______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    The radius daemon as shipped with the radiusd-cistron package is
    responsible for the RADIUS authentication service in networks and therefore
    considered a security critical application.
        ZARAZA reported security releated bugs in various radius server and
    client software. The list of vulnerable servers includes the cistron radius
    package. Within the cistron package, a buffer overflow in the digest
    calculation function and miscalculations of attribute lengths have been
    fixed which could allow remote attackers to execute arbitrary commands on
    the system running the radius server. Beside the cistron radius package the
    following radius packages have been vulnerable to the same attacks and have
    been fixed: freeradius, radiusclient and livingston-radius.
        The only workaround for this bug is to disable the radius-server until
    the new packages have been installed.

    Please download the update package for your distribution and verify its
    integrity by the methods listed in section 3) of this announcement.
    Then, install the package using the command "rpm -Fhv file.rpm" to apply
    the update.
    Our maintenance customers are being notified individually. The packages
    are being offered to install from the maintenance web.

    Once you successfully updated your radius packages, make sure you restart
    the radius server by issuing the following command as root:

        "/etc/rc.d/radiusd restart"

    "/etc/rc.d/radiusd" automatically invokes the correct radius-server which
    is part of either the cistron, livingston or freeradius package.


    i386 Intel Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/radiusd-cistron-1.6.4-168.i386.rpm
      8215e7113e8937844ab5d2deba8bbb13
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/radiusd-cistron-1.6.4-168.src.rpm
      978edf49cf7fa28c5e872bc48ba504ab

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n3/radiusd-cistron-1.6.4-167.i386.rpm
      964904ef67f81b2d19f1c8ef2ccc6f61
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/radiusd-cistron-1.6.4-167.src.rpm
      6ffd720c4ceb0e0c6d22446178d8bf11

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n3/radiusd-cistron-1.6.4-168.i386.rpm
      52ec1da0c4b750fe63d506713ff56c5e
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/radiusd-cistron-1.6.4-168.src.rpm
      6d34cc16bf9adcc93eac095570f49748

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/n2/cistron-1.6.3-76.i386.rpm
      52a9b0c7fcbd45973db6508d155edf21
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/cistron-1.6.3-76.src.rpm
      a22a646d5f04dd853906db9cc465f14a

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/n2/cistron-1.6.2-25.i386.rpm
      bed8804bf53822d7f7bcdd54f00a9d89
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/cistron-1.6.2-25.src.rpm
      b47877d68465e895fe899da9ba89709d


    Sparc Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/radiusd-cistron-1.6.4-65.sparc.rpm
      3230120f925437fd36b648991a3b4851
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/radiusd-cistron-1.6.4-65.src.rpm
      713f6f1f7fe4c2987a52b12df6ef2c4a

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n3/radiusd-cistron-1.6.4-65.sparc.rpm
      d444432bd863523992620401311f948b
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/radiusd-cistron-1.6.4-65.src.rpm
      ff7a7f432a0a32fbed31a6ee680d5118

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n2/cistron-1.6.3-4.sparc.rpm
      69ee7178a0312685a169386180cd5e9e
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/cistron-1.6.3-4.src.rpm
      71632b60b9b2bee4df06f940088b0ab6


    AXP Alpha Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n3/radiusd-cistron-1.6.4-69.alpha.rpm
      323032020d8c82724b12904db456c135
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/radiusd-cistron-1.6.4-69.src.rpm
      7440831ddb1e394ac6595e9e5bebbff1

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/n2/cistron-1.6.3-8.alpha.rpm
      4deb36542c3a76a9246618abcd656d96
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/cistron-1.6.3-8.src.rpm
      77c3cfe8cb64d7c2cd59b81e0e1e26ea

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/n2/cistron-1.6.2-20.alpha.rpm
      0c39bec71f6671c55b46ed627f2830d9
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/cistron-1.6.2-20.src.rpm
      8783c9b8f519a1623bf6df52a8878ab0


    PPC Power PC Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/radiusd-cistron-1.6.4-95.ppc.rpm
      a541869da6cfa45822887dc69f7730f8
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/radiusd-cistron-1.6.4-95.src.rpm
      da491549cda05ead01d2dd0519f14eeb

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n3/radiusd-cistron-1.6.4-95.ppc.rpm
      998f87b937ec36e55ee0151f82a071fa
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/radiusd-cistron-1.6.4-95.src.rpm
      ebb96d0b9b5093a5324c90743f7a69a3

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n2/cistron-1.6.3-85.ppc.rpm
      7258462a504e594f07433f342b0870c1
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/cistron-1.6.3-85.src.rpm
      d6ebb9cdd5c3538eae2db805f6fda97b

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n2/cistron-1.6.2-21.ppc.rpm
      6274908e60a8ff24a3be7c4936b36d90
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/cistron-1.6.2-21.src.rpm
      aa350c9fedc384c382744b4b2563250c


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - mtr
    A buffer overflow was found in mtr, which enables an attacker
    to get access to mtr's raw socket. Fixed RPM packages are
    available from our ftp servers. Additionally you should
    remove the setuid bit from mtr and add an appropriate entry
    in /etc/permissions.local.

    - webalizer
    A possible buffer overflow in the webalizer DNS resolv code
    was found. The bug seems no to be exploitable. The SuSE Security
    Team fixed this and other possible bugs in the webalizer code.
    New RPM packages will be available on our FTP servers.

    - ntop
    Version < 2.0.99 of ntop could be crashed by feeding ntop's HTTP
    code with invalid URL's. This bug does not exist in ntop version 2.0.1
    which is shipped with SuSE 8.0.

    - slrnpull
    Problems with slrnpull have been reported on the bugtraq mailinglist.
    SuSE does not ship this program setuid and is therefore not vulnerable
    to the buffer overflow attack against this program.

    - openssh
    Niels Provos published a local exploitable bug for OpenSSH.
    This bug could only be exploited if Kerberos and AFS support was
    enabled while compiling OpenSSH. The OpenSSH RPM file that comes with
    SuSE hasn't enabled Kerberos nor AFS, so we are not vulnerable to this
    attack. The bug will be fixed with the next security update of OpenSSH.

______________________________________________________________________________

3)  standard appendix: authenticity verification, additional information

  - Package authenticity verification:

    SuSE update packages are available on many mirror ftp servers all over
    the world. While this service is being considered valuable and important
    to the free and open source software community, many users wish to be
    sure about the origin of the package and its content before installing
    the package. There are two verification methods that can be used
    independently from each other to prove the authenticity of a downloaded
    file or rpm package:
    1) md5sums as provided in the (cryptographically signed) announcement.
    2) using the internal gpg signatures of the rpm package.

    1) execute the command
        md5sum 
       after you downloaded the file from a SuSE ftp server or its mirrors.
       Then, compare the resulting md5sum with the one that is listed in the
       announcement. Since the announcement containing the checksums is
       cryptographically signed (usually using the key security@suse.de),
       the checksums show proof of the authenticity of the package.
       We disrecommend to subscribe to security lists which cause the
       email message containing the announcement to be modified so that
       the signature does not match after transport through the mailing
       list software.
       Downsides: You must be able to verify the authenticity of the
       announcement in the first place. If RPM packages are being rebuilt
       and a new version of a package is published on the ftp server, all
       md5 sums for the files are useless.

    2) rpm package signatures provide an easy way to verify the authenticity
       of an rpm package. Use the command
        rpm -v --checksig 
       to verify the signature of the package, where  is the
       filename of the rpm package that you have downloaded. Of course,
       package authenticity verification can only target an uninstalled rpm
       package file.
       Prerequisites:
        a) gpg is installed
        b) The package is signed using a certain key. The public part of this
           key must be installed by the gpg program in the directory
           ~/.gnupg/ under the user's home directory who performs the
           signature verification (usually root). You can import the key
           that is used by SuSE in rpm packages for SuSE Linux by saving
           this announcement to a file ("announcement.txt") and
           running the command (do "su -" to be root):
            gpg --batch; gpg < announcement.txt | gpg --import
           SuSE Linux distributions version 7.1 and thereafter install the
           key "build@suse.de" upon installation or upgrade, provided that
           the package gpg is installed. The file containing the public key
           is placed at the toplevel directory of the first CD (pubring.gpg)
           and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .


  - SuSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
                .

    suse-security-announce@suse.com
        -   SuSE's announce-only mailing list.
            Only SuSE's security annoucements are sent to this list.
            To subscribe, send an email to
                .

    For general information or the frequently asked questions (faq)
    send mail to:
         or
         respectively.

    =====================================================================
    SuSE's security contact is  or .
    The  public key is listed below.
    =====================================================================
______________________________________________________________________________

    The information in this advisory may be distributed or reproduced,
    provided that the advisory is not modified in any way. In particular,
    it is desired that the cleartext signature shows proof of the
    authenticity of the text.
    SuSE GmbH makes no warranties of any kind whatsoever with respect
    to the information contained in this security advisory.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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-- 
~
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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