CVE-2011-4539 Denial of service in n/a
Remote attackers can crash the ISC DHCP daemon by sending a crafted request packet, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2011-4539?
CVE-2011-4539 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Dec 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.
Weakness: CWE-20
Which versions are affected by CVE-2011-4539?
It affects 3 products.
Linux distribution packages (20)
dhclient Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-common Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-debuginfo Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-devel Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhclient Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-common Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-debuginfo Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-devel Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhclient Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-common Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-debuginfo Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-devel Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhclient Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-common Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-debuginfo Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-25.P1.el6_2.1 |
dhcp-devel Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-25.P1.el6_2.1 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Isc Dhcp.
How do I fix CVE-2011-4539?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2011-4539 being exploited?
There is no known exploitation of CVE-2011-4539 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2011-4539, GHSA-4mm2-hqgc-vvw9, RHSA-2011:1819.