Otkriven je sigurnosni propust u programskom paketu dhcp kojeg udaljeni napadač može iskoristiti za izvođenje DoS napada.
| Paket: | dhcp 4.x |
| Operacijski sustavi: | Red Hat Enterprise Linux 6 |
| Kritičnost: | 5 |
| Problem: | pogreška u programskoj komponenti |
| Iskorištavanje: | udaljeno |
| Posljedica: | uskraćivanje usluga (DoS) |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2011-4539 |
| Izvorni ID preporuke: | RHSA-2011:1819-01 |
| Izvor: | Red Hat |
| Problem: | |
| Propust je uzrokovan nepravilnim korištenjem regularnih izraza u datoteci "dhcpd.conf". |
|
| Posljedica: | |
| Udaljeni napadač može iskoristiti navedeni propust za izvođenje DoS (eng. Denial of Service) napada. |
|
| Rješenje: | |
| Svim korisnicima se savjetuje korištenje nadogradnje koja otklanja opisani propust. |
|
Izvorni tekst preporuke
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=====================================================================
Red Hat Security Advisory
Synopsis: Moderate: dhcp security update
Advisory ID: RHSA-2011:1819-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1819.html
Issue date: 2011-12-14
CVE Names: CVE-2011-4539
=====================================================================
1. Summary:
Updated dhcp packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.
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:
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - 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 DHCP
request packets when regular expression matching was used in
"/etc/dhcp/dhcpd.conf". A remote attacker could use this flaw to crash
dhcpd. (CVE-2011-4539)
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/kb/docs/DOC-11259
5. Bugs fixed (http://bugzilla.redhat.com/):
761265 - CVE-2011-4539 dhcp: DoS due to processing certain regular expressions
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
i386:
dhclient-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
x86_64:
dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
i386:
dhcp-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
x86_64:
dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
x86_64:
dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
x86_64:
dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
i386:
dhclient-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
ppc64:
dhclient-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm
s390x:
dhclient-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.rpm
x86_64:
dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
i386:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
ppc64:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.ppc64.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.ppc.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.ppc64.rpm
s390x:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.s390x.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.s390.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.s390x.rpm
x86_64:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
i386:
dhclient-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
x86_64:
dhclient-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-common-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/dhcp-4.1.1-25.P1.el6_2.1.src.rpm
i386:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
x86_64:
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-debuginfo-4.1.1-25.P1.el6_2.1.x86_64.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.i686.rpm
dhcp-devel-4.1.1-25.P1.el6_2.1.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-2011-4539.html
https://access.redhat.com/security/updates/classification/#moderate
http://www.isc.org/software/dhcp/advisories/cve-2011-4539
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 2011 Red Hat, Inc.
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