CVE-2012-3955 Denial of service in n/a
Remote attackers can crash the ISC DHCP daemon by exploiting IPv6 lease expiration logic, requiring specific lease time configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2012-3955?
CVE-2012-3955 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 14 Sep 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ISC DHCP 4.1.x before 4.1-ESV-R7 and 4.2.x before 4.2.4-P2 allows remote attackers to cause a denial of service (daemon crash) in opportunistic circumstances by establishing an IPv6 lease in an environment where the lease expiration time is later reduced.
Which versions are affected by CVE-2012-3955?
It affects 3 products.
Linux distribution packages (20)
dhclient Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-34.P1.el6 |
dhcp Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-34.P1.el6 |
dhcp-common Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-34.P1.el6 |
dhcp-debuginfo Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-34.P1.el6 |
dhcp-devel Red Hat:enterprise_linux:6::client | All versions | 12:4.1.1-34.P1.el6 |
dhclient Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-34.P1.el6 |
dhcp Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-34.P1.el6 |
dhcp-common Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-34.P1.el6 |
dhcp-debuginfo Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-34.P1.el6 |
dhcp-devel Red Hat:enterprise_linux:6::computenode | All versions | 12:4.1.1-34.P1.el6 |
dhclient Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-34.P1.el6 |
dhcp Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-34.P1.el6 |
dhcp-common Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-34.P1.el6 |
dhcp-debuginfo Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-34.P1.el6 |
dhcp-devel Red Hat:enterprise_linux:6::server | All versions | 12:4.1.1-34.P1.el6 |
dhclient Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-34.P1.el6 |
dhcp Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-34.P1.el6 |
dhcp-common Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-34.P1.el6 |
dhcp-debuginfo Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-34.P1.el6 |
dhcp-devel Red Hat:enterprise_linux:6::workstation | All versions | 12:4.1.1-34.P1.el6 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Isc Dhcp.
How do I fix CVE-2012-3955?
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-2012-3955 being exploited?
There is no known exploitation of CVE-2012-3955 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2012-3955, DSA-2551-1, GHSA-6xcv-87wr-7rfm, RHSA-2013:0504.