CVE-2014-8602 Denial of service in n/a

Medium 4.3 Published 11 Dec 2014 Updated 6 Aug 2024

Remote attackers can cause denial of service in Unbound DNS resolver by triggering excessive delegation chaining, leading to resource exhaustion.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2014-8602?

CVE-2014-8602 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 11 Dec 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

iterator.c in NLnet Labs Unbound before 1.5.1 does not limit delegation chaining, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a large or infinite number of referrals.

Weakness: CWE-399

Which versions are affected by CVE-2014-8602?

It affects 3 products.

Linux distribution packages (21)

`unbound` Red Hat:enterprise_linux:7::client	All versions	`0:1.4.20-26.el7`
`unbound-debuginfo` Red Hat:enterprise_linux:7::client	All versions	`0:1.4.20-26.el7`
`unbound-devel` Red Hat:enterprise_linux:7::client	All versions	`0:1.4.20-26.el7`
`unbound-libs` Red Hat:enterprise_linux:7::client	All versions	`0:1.4.20-26.el7`
`unbound-python` Red Hat:enterprise_linux:7::client	All versions	`0:1.4.20-26.el7`
`unbound` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.4.20-26.el7`
`unbound-debuginfo` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.4.20-26.el7`
`unbound-devel` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.4.20-26.el7`
`unbound-libs` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.4.20-26.el7`
`unbound-python` Red Hat:enterprise_linux:7::computenode	All versions	`0:1.4.20-26.el7`
`unbound` Red Hat:enterprise_linux:7::server	All versions	`0:1.4.20-26.el7`
`unbound-debuginfo` Red Hat:enterprise_linux:7::server	All versions	`0:1.4.20-26.el7`
`unbound-devel` Red Hat:enterprise_linux:7::server	All versions	`0:1.4.20-26.el7`
`unbound-libs` Red Hat:enterprise_linux:7::server	All versions	`0:1.4.20-26.el7`
`unbound-python` Red Hat:enterprise_linux:7::server	All versions	`0:1.4.20-26.el7`
`unbound` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.4.20-26.el7`
`unbound-debuginfo` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.4.20-26.el7`
`unbound-devel` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.4.20-26.el7`
`unbound-libs` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.4.20-26.el7`
`unbound-python` Red Hat:enterprise_linux:7::workstation	All versions	`0:1.4.20-26.el7`
`unbound` openSUSE:Tumbleweed	All versions	`1.5.10-1.1`

Products include Canonical Ubuntu Linux, Debian Debian Linux, Nlnetlabs Unbound.

How do I fix CVE-2014-8602?

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-2014-8602 being exploited?

There is no known exploitation of CVE-2014-8602 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2014-8602, DLA-107-1, DSA-3097-1, GHSA-rmpj-rcj8-qh82, RHSA-2015:2455, UBUNTU-CVE-2014-8602 and 2 more.