Executive Summary

NameCVE-2011-4869First vendor Publication2011-12-20
VendorCveLast vendor Modification2017-08-28

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score7.8Attack RangeNetwork
Cvss Impact Score6.9Attack ComplexityLow
Cvss Expoit Score10AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores


validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4869

CWE : Common Weakness Enumeration

100 %CWE-399Resource Management Errors

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:15048
Oval ID: oval:org.mitre.oval:def:15048
Title: DSA-2370-1 unbound -- several
Description: It was discovered that Unbound, a recursive DNS resolver, would crash when processing certain malformed DNS responses from authoritative DNS servers, leading to denial of service. CVE-2011-4528 Unbound attempts to free unallocated memory during processing of duplicate CNAME records in a signed zone. CVE-2011-4869 Unbound does not properly process malformed responses which lack expected NSEC3 records.
Family: unix Class: patch
Reference(s): DSA-2370-1
Version: 5
Platform(s): Debian GNU/Linux 5.0
Debian GNU/Linux 6.0
Debian GNU/kFreeBSD 6.0
Product(s): unbound
Definition Synopsis:

CPE : Common Platform Enumeration


OpenVAS Exploits

2012-04-02Name : Fedora Update for unbound FEDORA-2011-17282
File : nvt/gb_fedora_2011_17282_unbound_fc16.nasl
2012-02-11Name : Debian Security Advisory DSA 2370-1 (unbound)
File : nvt/deb_2370_1.nasl
2012-01-09Name : Fedora Update for unbound FEDORA-2011-17337
File : nvt/gb_fedora_2011_17337_unbound_fc15.nasl
2011-12-20Name : Unbound Multiple Denial of Service Vulnerabilities
File : nvt/gb_unbound_51115.nasl

Open Source Vulnerability Database (OSVDB)

77910Unbound NSEC3-Signed Zones Response Parsing Remote DoS

Nessus® Vulnerability Scanner

2013-11-29Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201311-18.nasl - Type : ACT_GATHER_INFO
2012-01-17Name : The remote name server is affected by multiple denial of service vulnerabilit...
File : unbound_1_4_14.nasl - Type : ACT_GATHER_INFO
2012-01-12Name : The remote Debian host is missing a security-related update.
File : debian_DSA-2370.nasl - Type : ACT_GATHER_INFO
2012-01-03Name : The remote Fedora host is missing a security update.
File : fedora_2011-17282.nasl - Type : ACT_GATHER_INFO
2012-01-03Name : The remote Fedora host is missing a security update.
File : fedora_2011-17337.nasl - Type : ACT_GATHER_INFO

Sources (Detail)

CERT-VN http://www.kb.cert.org/vuls/id/209659
CONFIRM http://unbound.nlnetlabs.nl/downloads/CVE-2011-4528.txt
DEBIAN http://www.debian.org/security/2011/dsa-2370
FEDORA http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071525...
XF https://exchange.xforce.ibmcloud.com/vulnerabilities/71868

Alert History

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2017-08-29 09:23:37
  • Multiple Updates
2016-06-28 18:55:42
  • Multiple Updates
2016-04-26 21:18:32
  • Multiple Updates
2014-02-17 11:06:34
  • Multiple Updates
2013-05-10 23:12:06
  • Multiple Updates