FreeBSD 10.0/10.1 Unbound iterator.c DNS Query resource management

CVSS Meta Temp Score
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in FreeBSD 10.0/10.1. This impacts an unknown function of the file iterator.c of the component Unbound. Executing a manipulation as part of DNS Query can lead to resource management. This vulnerability is registered as CVE-2014-8602. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in FreeBSD 10.0/10.1 (Operating System) and classified as problematic. This vulnerability affects an unknown functionality of the file iterator.c of the component Unbound. The manipulation as part of a DNS Query leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. CVE summarizes:

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.
The advisory summarizes:
Unbound is a validating, recursive, and caching DNS resolver.

The weakness was published 12/17/2014 by Florian Maury with ANSSI as FreeBSD-SA-14:30.unbound as confirmed advisory (Website). The advisory is shared for download at freebsd.org. This vulnerability was named CVE-2014-8602 since 11/04/2014. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The advisory points out:

By causing queries to be made against a maliciously-constructed zone or against a malicious DNS server, an attacker who is able to cause specific queries to be sent to a nameserver can trick unbound(8) resolver into following an endless series of delegations, which consumes a lot of resources.

The vulnerability scanner Nessus provides a plugin with the ID 80142 (Fedora 20 : unbound-1.5.1-2.fc20 (2014-16671)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155378 (Oracle Enterprise Linux Security Update for unbound (ELSA-2015-2455)).

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (99328), Tenable (80142), SecurityFocus (BID 71589†) and Vulnerability Center (SBV-47563†). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.7
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 80142
Nessus Name: Fedora 20 : unbound-1.5.1-2.fc20 (2014-16671)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 703097
OpenVAS Name: Debian Security Advisory DSA 3097-1 (unbound - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍
Fortigate IPS: 🔍

Timelineinfo

11/04/2014 🔍
12/08/2014 +34 days 🔍
12/09/2014 +1 days 🔍
12/10/2014 +1 days 🔍
12/11/2014 +1 days 🔍
12/17/2014 +6 days 🔍
12/17/2014 +0 days 🔍
12/17/2014 +0 days 🔍
12/22/2014 +5 days 🔍
12/09/2024 +3640 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: FreeBSD-SA-14:30.unbound
Researcher: Florian Maury
Organization: ANSSI
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-8602 (🔍)
GCVE (CVE): GCVE-0-2014-8602
GCVE (VulDB): GCVE-100-68440

OVAL: 🔍

CERT: 🔍
X-Force: 99328 - NLnet Labs Unbound delegation chaining denial of service, Medium Risk
SecurityFocus: 71589 - Unbound CVE-2014-8602 Remote Denial of Service Vulnerability
Vulnerability Center: 47563 - NLnet Labs Unbound Before 1.5.1 Remote DoS Vulnerability via a Large or Infinite Number of Referrals, High

Entryinfo

Created: 12/17/2014 11:04
Updated: 12/09/2024 02:08
Changes: 12/17/2014 11:04 (79), 06/15/2017 11:20 (4), 03/01/2022 12:42 (3), 10/30/2024 05:09 (15), 12/09/2024 02:08 (4)
Complete: 🔍
Cache ID: 216:396:103

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