-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ________________________________________________________________________ OpenPKG Security Advisory The OpenPKG Project http://www.openpkg.org/security.html http://www.openpkg.org openpkg-securityat_private openpkgat_private OpenPKG-SA-2003.012 19-Feb-2003 ________________________________________________________________________ Package: dhcpd Vulnerability: denial of service (packet storm) OpenPKG Specific: no Affected Releases: Affected Packages: Corrected Packages: OpenPKG CURRENT <= dhcpd-3.0.1rc11-20030116 >= dhcpd-3.0.1rc11-20030219 OpenPKG 1.2 <= dhcpd-3.0.1rc11-1.2.0 >= dhcpd-3.0.1rc11-1.2.1 OpenPKG 1.1 <= dhcpd-3.0.1rc9-1.1.1 >= dhcpd-3.0.1rc9-1.1.2 Affected Releases: Dependent Packages: none Description: Florian Lohoff discovered a bug [0] in dhcrelay which is part of the ISC DHCP Distribution [1]. The bug is causing the relay agent to send a continuing packet storm towards the configured DHCP server(s) in case of a malicious BOOTP packet. The Common Vulnerabilities and Exposures (CVE) project assigned the id CAN-2003-0039 [2] to the problem. Our update does not ultimately fix the root cause of the problem. However, it improves dhcrelay's compliance to RFC1542 [10] by rigorously supporting the requirements listed in section "4.1.1 BOOTREQUEST Messages" and thus limiting havoc wreaked to the network: "The relay agent MUST silently discard BOOTREQUEST messages whose 'hops' field exceeds the value 16. A configuration option SHOULD be provided to set this threshold to a smaller value if desired by the network manager. The default setting for a configurable threshold SHOULD be 4." The added configuration option is named "-c". Its default value to 4 and the allowed range of the value is between 0 and 16. Please check whether you are affected by running "<prefix>/bin/rpm -q dhcpd". If you have the "dhcpd" package installed and its version is affected (see above), we recommend that you immediately upgrade it (see Solution). [3][4] Solution: Select the updated source RPM appropriate for your OpenPKG release [5][6], fetch it from the OpenPKG FTP service [7][8] or a mirror location, verify its integrity [9], build a corresponding binary RPM from it [3] and update your OpenPKG installation by applying the binary RPM [4]. For the current release OpenPKG 1.1, perform the following operations to permanently fix the security problem (for other releases adjust accordingly). $ ftp ftp.openpkg.org ftp> bin ftp> cd release/1.2/UPD ftp> get dhcpd-3.0.1rc11-1.2.1.src.rpm ftp> bye $ <prefix>/bin/rpm -v --checksig dhcpd-3.0.1rc11-1.2.1.src.rpm $ <prefix>/bin/rpm --rebuild dhcpd-3.0.1rc11-1.2.1.src.rpm $ su - # <prefix>/bin/rpm -Fvh <prefix>/RPM/PKG/dhcpd-3.0.1rc11-1.2.1.*.rpm ________________________________________________________________________ References: [0] http://marc.theaimsgroup.com/?l=bugtraq&m=104310927813830&w=2 [1] http://www.isc.org/products/DHCP/dhcp-v3.html [2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0039 [3] http://www.openpkg.org/tutorial.html#regular-source [4] http://www.openpkg.org/tutorial.html#regular-binary [5] ftp://ftp.openpkg.org/release/1.1/UPD/dhcpd-3.0.1rc9-1.1.2.src.rpm [6] ftp://ftp.openpkg.org/release/1.2/UPD/dhcpd-3.0.1rc11-1.2.1.src.rpm [7] ftp://ftp.openpkg.org/release/1.1/UPD/ [8] ftp://ftp.openpkg.org/release/1.2/UPD/ [9] http://www.openpkg.org/security.html#signature [10] ftp://ftp.rfc-editor.org/in-notes/rfc1542.txt ________________________________________________________________________ For security reasons, this advisory was digitally signed with the OpenPGP public key "OpenPKG <openpkgat_private>" (ID 63C4CB9F) of the OpenPKG project which you can find under the official URL http://www.openpkg.org/openpkg.pgp or on http://keyserver.pgp.com/. To check the integrity of this advisory, verify its digital signature by using GnuPG (http://www.gnupg.org/). For instance, pipe this message to the command "gpg --verify --keyserver keyserver.pgp.com". ________________________________________________________________________ -----BEGIN PGP SIGNATURE----- Comment: OpenPKG <openpkgat_private> iD8DBQE+U5MDgHWT4GPEy58RAu2qAKDMZ71rpxv4YgazQQw2fSi2mlfTIACfflr6 OF+yy6uSaCRuw/RlzUVzhic= =kWcV -----END PGP SIGNATURE-----
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