Säkerhetsbulletin från Debian

DSA-245-1 dhcp3 -- ignorerad räknarbegränsning

Rapporterat den:

2003-01-28

Berörda paket:

Sårbara:

Referenser i säkerhetsdatabaser:

I Bugtraq-databasen (hos SecurityFocus): BugTraq-id 6628.
I Mitres CVE-förteckning: CVE-2003-0039.
CERTs information om sårbarheter, bulletiner och incidenter: VU#149953.

Ytterligare information:

Florian Lohoff upptäckte ett fel i dhcrelay vilket fick det att sända en kontinuerlig storm av paket till den konfigurerade DHCP-servern vid felaktiga BOOTP-paket, vilka till exempel som sänds från trasiga Ciscoväxlar.

När dhcp-relay tar emot en BOOTP-förfrågan vidaresänder den frågan till DHCP-servern genom att använda ”broadcast”-MAC-adressen ff:ff:ff:ff:ff:ff vilket gör att nätverksgränssnittet reflekterar paketet tillbaka in i uttaget (socket:en). För att förhindra slingor kontrollerar dhcrelay om reläadressen är dess egen, varpå paketet skulle förkastas. I kombination med en avsaknad övre begränsning för hoppräknaren kunde en angripare tvinga dhcp-relay att sända en kontinuerlig storm av paket mot den konfigurerade dhcp-servern.

Denna patch introducerar en ny kommandoradsflagga ”-c maxantal” och användarna rekommenderas att starta dhcp-relay med ”dhcrelay -c 10” eller ett lägre tal, vilket endast kommer skapa så många paket.

Dhcrelayprogrammet från paketet dhcp verkar inte påverkas eftersom DHCP-paket förkastas om de redan verkar ha reläats.

För den stabila utgåvan (Woody) har detta problem rättats i version 3.0+3.0.1rc9-2.2.

Den gamla stabila utgåvan (Potato) innehåller inte dhcp3-paket.

För den instabila utgåvan (Sid) har detta problem rättats i version 1.1.2-1.

Vi rekommenderar att ni uppgraderar ert dhcp3-paket om ni använder dhcrelay-servern.

Rättat i:

Debian GNU/Linux 3.0 (woody)

Källkod:: 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-kontrollsummor för dessa filer finns i originalbulletinen.