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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
(SuSE Issues Fix) Re: Internet Software Consortium DHCP Implementation Has Format String Hole That Lets Remote Users Gain Root Access
SecurityTracker Alert ID:  1004358
SecurityTracker URL:  http://securitytracker.com/id/1004358
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  May 23 2002
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.0.1rc8 and prior versions
Description:   A format string vulnerability was reported in the Internet Software Consortium (ISC) dynamic host control protocol daemon (DHCPD) implementation. A remote user can gain root access on the system.

Next Generation Security Technologies reported that ISC DHCPD verrsion 3 includes a dns-update feature that is compiled by default and contains a format string flaw.

When the DHCPD daemon receives a DHCP request, it will generate a dns-update request. A remote user with control of a DNS server can create a malformed dns-update response and send it to the vulnerable DHCPD server in response to one of these dns-update requests. The user-supplied dns-update response information is then logged by DHCPD without specifying a format string. A remote user can apparently query the ISC DHCP server with a hostname field containing a malicious format string (%n), causing the server to execute arbitrary code with root level privileges.

CERT has issued an advisory located at:

http://www.cert.org/advisories/CA-2002-12.html

Impact:   A remote user can cause arbitrary code to be executed with root level privileges, giving the remote user root level access to the system.
Solution:   SuSE has issued a fix:

i386 Intel Platform:

SuSE-8.0
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-server-3.0.1rc6-8.i386.rpm
754569c059f5f2c4f71397f6c6498f53
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/dhcp-3.0.1rc6-8.src.rpm
82ab4455ae86a932a746778ca0cf06f1

SuSE-7.3
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/dhcp-3.0rc12-47.i386.rpm
58bdf5e4e0622ba280fad0d649a36bdd
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/dhcp-3.0rc12-47.src.rpm
20abdc3bad4810971aa4cc959c133a9e

SuSE-7.2
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/dhcp-3.0rc4-27.i386.rpm
826ffc2524ad6a6b3b746e3c5e0e5413
source rpm:
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/dhcp-3.0rc4-27.src.rpm
7bfd527698beef5a83e60577e7e02cfb



Sparc Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/dhcp-3.0rc12-22.sparc.rpm
15ec49d27e7f8b61ec22616484e43996
source rpm:
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/dhcp-3.0rc12-22.src.rpm
1e3f0ee6da5684a49b31908f0e6ac9dd



PPC Power PC Platform:

SuSE-7.3
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/dhcp-3.0rc12-32.ppc.rpm
76914c072100dff6fdf781ed81f7afeb
source rpm:
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/dhcp-3.0rc12-32.src.rpm
9ac78f35a529c24315f11184555c7f81

See the Source Message for the vendor's advisory containing directions on how to apply the appropriate fix.

Vendor URL:  www.isc.org/products/DHCP/ (Links to External Site)
Cause:   Input validation error
Underlying OS:   Linux (SuSE)

Message History:   This archive entry is a follow-up to the message listed below.
May 8 2002 Internet Software Consortium DHCP Implementation Has Format String Hole That Lets Remote Users Gain Root Access



 Source Message Contents

Date:  Wed, 22 May 2002 19:01:58 +0200 (CEST)
Subject:  SuSE Security Announcement: dhcp/dhcp-server (SuSE-SA:2002:019)


-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                dhcp/dhcp-server
        Announcement-ID:        SuSE-SA:2002:019
        Date:                   Wednesday, May 22th 2002 13:30 MEST
        Affected products:      7.2, 7.3, 8.0
                                SuSE Linux Database Server
                                SuSE eMail Server III
                                SuSE Linux Enterprise Server for S/390
                                SuSE Linux Connectivity Server
                                SuSE Linux Enterprise Server 7
        Vulnerability Type:     remote command execution
        Severity (1-10):        4
        SuSE default package:   no
        Other affected systems: all systems using ISC DHCP server 3.x

    Content of this advisory:
        1) security vulnerability resolved: format string bug in dynamic DNS
                                            code
           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 "Dynamic Host Configuration Protocol" (DHCP) server from the Internet
    Software Consortium allows hosts on a TCP/IP network to request and be
    assigned IP addresses, and also to discover information about the network
    to which they are attached.

    A remote exploitable format string vulnerability was found in the logging
    routines of the dynamic DNS code of dhcpd. This vulnerability allows an
    attacker, usually within the LAN served by the DHCP server, to get remote
    root access to the host running dhcpd.

    The dhcp/dhcp-server package is not installed by default nor is the
    dynamic DNS feature enabled by default.
    As temporary workaround the dynamic DNS feature could be disabled via
    dhcpd's config file with the following lines:
        ddns-update-style none;
        ddns-updates off;
    After updating the package or modifying the config file you have to run:
        rcdhcpd restart
    as root to restart all instances of running dhcpd processes.

    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.



    i386 Intel Platform:

    SuSE-8.0
      ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-server-3.0.1rc6-8.i386.rpm
      754569c059f5f2c4f71397f6c6498f53
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/dhcp-3.0.1rc6-8.src.rpm
      82ab4455ae86a932a746778ca0cf06f1

    SuSE-7.3
      ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/dhcp-3.0rc12-47.i386.rpm
      58bdf5e4e0622ba280fad0d649a36bdd
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/dhcp-3.0rc12-47.src.rpm
      20abdc3bad4810971aa4cc959c133a9e

    SuSE-7.2
      ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/dhcp-3.0rc4-27.i386.rpm
      826ffc2524ad6a6b3b746e3c5e0e5413
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/dhcp-3.0rc4-27.src.rpm
      7bfd527698beef5a83e60577e7e02cfb



    Sparc Platform:

    SuSE-7.3
      ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/dhcp-3.0rc12-22.sparc.rpm
      15ec49d27e7f8b61ec22616484e43996
    source rpm:
      ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/dhcp-3.0rc12-22.src.rpm
      1e3f0ee6da5684a49b31908f0e6ac9dd



    PPC Power PC Platform:

    SuSE-7.3
      ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/dhcp-3.0rc12-32.ppc.rpm
      76914c072100dff6fdf781ed81f7afeb
    source rpm:
      ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/dhcp-3.0rc12-32.src.rpm
      9ac78f35a529c24315f11184555c7f81



______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  - tcpdump/libpcap
    Various security and non-security related bugs were found in the code
    of tcpdump and libpcap. New RPMs are currently being build.


______________________________________________________________________________

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 <name-of-the-file.rpm>
       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 <file.rpm>
       to verify the signature of the package, where <file.rpm> 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-subscribe@suse.com>.

    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
                <suse-security-announce-subscribe@suse.com>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <suse-security-info@suse.com> or
        <suse-security-faq@suse.com> respectively.

    =====================================================================
    SuSE's security contact is <security@suse.com> or <security@suse.de>.
    The <security@suse.de> 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 Linux AG 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 <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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Bye,
     Thomas
-- 
  Thomas Biege <thomas@suse.de>
  SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg
  Function: Security Support & Auditing
  "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
  Key fingerprint = 51 AD B9 C7 34 FC F2 54  01 4A 1C D4 66 64 09 83
-- 
	Trete durch die Form ein, und trete aus der Form heraus.


 
 


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