PT-2011-1204 · Isc+2 · Dhcp+2

Published 2011-12-08 · Updated 2024-06-15 · CVE-2011-4539

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions dhcp versions prior to 4.2.4 p2 ISC DHCP 4.x versions prior to 4.2.3-P1 ISC DHCP 4.1-ESV versions prior to 4.1-ESV-R4

Description The issue is related to multiple vulnerabilities in the dhcp package, which can be exploited remotely, leading to a denial of service and potentially disrupting the availability of protected information. Specifically, the dhcpd in ISC DHCP does not properly handle regular expressions in dhcpd.conf, allowing remote attackers to cause a daemon crash via a crafted request packet.

Recommendations For dhcp versions prior to 4.2.4 p2, update to version 4.2.4 p2 or later to resolve the issue. For ISC DHCP 4.x versions prior to 4.2.3-P1, update to version 4.2.3-P1 or later to resolve the issue. For ISC DHCP 4.1-ESV versions prior to 4.1-ESV-R4, update to version 4.1-ESV-R4 or later to resolve the issue. As a temporary workaround, consider restricting access to the dhcpd.conf file to minimize the risk of exploitation.

Fix

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2015-09699

CESA-2011_1819

CVE-2011-4539

DSA-2519-1

DSA-2519-2

OPENSUSE-SU-2024:10358-1

RHSA-2011:1819

RHSA-2011_1819

Affected Products

Centos

Red Hat

Dhcp

References · 44

• https://isc.org/software/dhcp/advisories/cve-2011-4539 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2011-1819.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2015-09699 · Security Note
• http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.html · Vendor Advisory
• http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.html · Vendor Advisory
• http://security.gentoo.org/glsa/glsa-201301-06.xml · Vendor Advisory
• http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.html · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2011-4539 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2011-4539 · Vendor Advisory
• http://ubuntu.com/usn/USN-1309-1 · Vendor Advisory
• http://debian.org/security/2012/dsa-2519 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:10358-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4539 · Security Note
• http://mandriva.com/security/advisories?name=MDVSA-2011:182 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2011-4539 · Vendor Advisory