Kod programskog paketa dhcp, za operacijski sustav Red Hat Enterprise Linux 5, otkriven je sigurnosni nedostatak kojeg udaljeni napadač može iskoristiti za izvođenje DoS napada.
Paket:
dhcp 4.x
Operacijski sustavi:
Red Hat Enterprise Linux 5
Problem:
pogreška u programskoj komponenti
Iskorištavanje:
udaljeno
Posljedica:
uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-3571
Izvorni ID preporuke:
RHSA-2012:1140-01
Izvor:
Red Hat
Problem:
Propust je posljedica nepravilnog rukovanja oštećenim oznakama identifikatora klijenata.
Posljedica:
Zlonamjerni korisnik može iskoristiti spomenuti nedostatak za izvođenje DoS napada.
Rješenje:
Svim se korisnicima navedenog programskog paketa, u svrhu zaštite sigurnosti, savjetuje njegova nadogradnja na novije inačice.
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Red Hat Security Advisory
Synopsis: Moderate: dhcp security update
Advisory ID: RHSA-2012:1140-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-1140.html
Issue date: 2012-08-03
CVE Names: CVE-2012-3571
=====================================================================
1. Summary:
Updated dhcp packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.
The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.
2. Relevant releases/architectures:
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
3. Description:
The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows
individual devices on an IP network to get their own network configuration
information, including an IP address, a subnet mask, and a broadcast
address.
A denial of service flaw was found in the way the dhcpd daemon handled
zero-length client identifiers. A remote attacker could use this flaw to
send a specially-crafted request to dhcpd, possibly causing it to enter an
infinite loop and consume an excessive amount of CPU time. (CVE-2012-3571)
Upstream acknowledges Markus Hietava of the Codenomicon CROSS project as
the original reporter of this issue.
Users of DHCP should upgrade to these updated packages, which contain a
backported patch to correct this issue. After installing this update, all
DHCP servers will be restarted automatically.
4. Solution:
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258
5. Bugs fixed (http://bugzilla.redhat.com/):
842420 - CVE-2012-3571 dhcp: DoS due to error in handling malformed client
identifiers
6. Package List:
Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/dhcp-3.0.5-31.el5_8.1.src.rpm
i386:
dhclient-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
x86_64:
dhclient-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/dhcp-3.0.5-31.el5_8.1.src.rpm
i386:
dhcp-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
x86_64:
dhcp-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/dhcp-3.0.5-31.el5_8.1.src.rpm
i386:
dhclient-3.0.5-31.el5_8.1.i386.rpm
dhcp-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
ia64:
dhclient-3.0.5-31.el5_8.1.ia64.rpm
dhcp-3.0.5-31.el5_8.1.ia64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ia64.rpm
dhcp-devel-3.0.5-31.el5_8.1.ia64.rpm
libdhcp4client-3.0.5-31.el5_8.1.ia64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ia64.rpm
ppc:
dhclient-3.0.5-31.el5_8.1.ppc.rpm
dhcp-3.0.5-31.el5_8.1.ppc.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ppc.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.ppc64.rpm
dhcp-devel-3.0.5-31.el5_8.1.ppc.rpm
dhcp-devel-3.0.5-31.el5_8.1.ppc64.rpm
libdhcp4client-3.0.5-31.el5_8.1.ppc.rpm
libdhcp4client-3.0.5-31.el5_8.1.ppc64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ppc.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.ppc64.rpm
s390x:
dhclient-3.0.5-31.el5_8.1.s390x.rpm
dhcp-3.0.5-31.el5_8.1.s390x.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.s390.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.s390x.rpm
dhcp-devel-3.0.5-31.el5_8.1.s390.rpm
dhcp-devel-3.0.5-31.el5_8.1.s390x.rpm
libdhcp4client-3.0.5-31.el5_8.1.s390.rpm
libdhcp4client-3.0.5-31.el5_8.1.s390x.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.s390.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.s390x.rpm
x86_64:
dhclient-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.i386.rpm
dhcp-debuginfo-3.0.5-31.el5_8.1.x86_64.rpm
dhcp-devel-3.0.5-31.el5_8.1.i386.rpm
dhcp-devel-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-3.0.5-31.el5_8.1.x86_64.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.i386.rpm
libdhcp4client-devel-3.0.5-31.el5_8.1.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package
7. References:
https://www.redhat.com/security/data/cve/CVE-2012-3571.html
https://access.redhat.com/security/updates/classification/#moderate
http://www.isc.org/software/dhcp/advisories/cve-2012-3571
8. Contact:
The Red Hat security contact is <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2012 Red Hat, Inc.
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