Debians sikkerhedsbulletin

DSA-245-1 dhcp3 -- ignoreret tællergrænse

Rapporteret den:

28. jan 2003

Berørte pakker:

Sårbar:

Referencer i sikkerhedsdatabaser:

I Bugtraq-databasen (hos SecurityFocus): BugTraq-id 6628.
I Mitres CVE-ordbog: CVE-2003-0039.
CERTs noter om sårbarheder, bulletiner og hændelser: VU#149953.

Yderligere oplysninger:

Florian Lohoff har opdaget en fejl i dhcrelay, der får programmet til at sende en fortløbende pakkestorm mod den eller de opsatte DHCP-servere i forbindelse med ondsindede BOOTP-pakker, som kan sendes fra fejlbehæftede Cisco-switche.

Når DHCP-relay'et modtager en BOOTP-forespørgsel, sender programmet forespørgslen videre til DHCP-serveren ved hjælp af broadcast-MAC-adressen ff:ff:ff:ff:ff:ff, hvilket får netværksgrænsefladen til at spejle pakken tilbage til socket'en. For at forhindre løkker, kontrollerer dhcrelay hvorvidt relay-adressen er dens egen, er det tilfældet bliver pakken smidt væk. Kombinereret med en manglende kontrol af en øvre grænse til hop-tælleren, kan en angriber tvinge DHCP-relay'et til at sende en fortløbende pakkestorm til den eller de opsatte DHCP-servere.

Denne rettelse bibringer et nyt kommandolinieparameter, -c maxcount, og man rådes til at starte DHCP-relay'et med dhcrelay -c 10 eller et mindre nummer, hvilket kun opretter det pågældende antal pakker.

Programmet dhcrelay fra "dhcp"-pakken, lader ikke til at være påvirket, da DHCP-pakker smides væk, hvis de lader til allerede at have været igennem et relay.

I den stabile distribution (woody) er dette problem rettet i version 3.0+3.0.1rc9-2.2.

Den gamle stabile distribution (potato) indeholder ikke dhcp3-pakker.

I den ustabile distribution (sid) er dette problem rettet i version 1.1.2-1.

Vi anbefaler at du opgraderer dine dhcp3-pakker, hvis du bruger dhcrelay-serveren.

Rettet i:

Debian GNU/Linux 3.0 (woody)

Kildekode:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3_3.0+3.0.1rc9-2.2.dsc; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3_3.0+3.0.1rc9-2.2.diff.gz; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3_3.0+3.0.1rc9.orig.tar.gz
Alpha:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_alpha.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_alpha.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_alpha.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_alpha.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_alpha.deb
ARM:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_arm.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_arm.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_arm.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_arm.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_arm.deb
Intel IA-32:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_i386.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_i386.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_i386.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_i386.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_i386.deb
Intel IA-64:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_ia64.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_ia64.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_ia64.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_ia64.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_ia64.deb
HPPA:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_hppa.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_hppa.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_hppa.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_hppa.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_hppa.deb
Motorola 680x0:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_m68k.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_m68k.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_m68k.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_m68k.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_m68k.deb
Big endian MIPS:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_mips.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_mips.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_mips.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_mips.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_mips.deb
Little endian MIPS:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_mipsel.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_mipsel.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_mipsel.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_mipsel.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_mipsel.deb
PowerPC:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_powerpc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_powerpc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_powerpc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_powerpc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_powerpc.deb
IBM S/390:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_s390.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_s390.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_s390.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_s390.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_s390.deb
Sun Sparc:: http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-client_3.0+3.0.1rc9-2.2_sparc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-common_3.0+3.0.1rc9-2.2_sparc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-dev_3.0+3.0.1rc9-2.2_sparc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-relay_3.0+3.0.1rc9-2.2_sparc.deb; http://security.debian.org/pool/updates/main/d/dhcp3/dhcp3-server_3.0+3.0.1rc9-2.2_sparc.deb

MD5-kontrolsummer for de listede filer findes i den originale sikkerhedsbulletin.