Executive Summary

Summary
Title Unbound: Denial of Service
Informations
Name GLSA-201311-18 First vendor Publication 2013-11-28
Vendor Gentoo Last vendor Modification 2013-11-28
Severity (Vendor) Normal Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

Multiple Denial of Service vulnerabilities have been found in Unbound.

Background

Unbound is a validating, recursive, and caching DNS resolver.

Description

Multiple vulnerabilities have been discovered in Unbound. Please review the CVE identifiers referenced below for details.

Impact

A remote attacker could possibly cause a Denial of Service condition via a specially crafted response.

Workaround

There is no known workaround at this time.

Resolution

All Unbound users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/unbound-1.4.13_p2"

References

[ 1 ] CVE-2011-4528 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4528
[ 2 ] CVE-2011-4869 : http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-4869

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-201311-18.xml

Original Source

Url : http://security.gentoo.org/glsa/glsa-201311-18.xml

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-399 Resource 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
CVE-2011-4528
CVE-2011-4869
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

TypeDescriptionCount
Application 41

OpenVAS Exploits

Date Description
2012-04-02 Name : Fedora Update for unbound FEDORA-2011-17282
File : nvt/gb_fedora_2011_17282_unbound_fc16.nasl
2012-02-11 Name : Debian Security Advisory DSA 2370-1 (unbound)
File : nvt/deb_2370_1.nasl
2012-01-09 Name : Fedora Update for unbound FEDORA-2011-17337
File : nvt/gb_fedora_2011_17337_unbound_fc15.nasl
2011-12-20 Name : Unbound Multiple Denial of Service Vulnerabilities
File : nvt/gb_unbound_51115.nasl
0000-00-00 Name : FreeBSD Ports: unbound
File : nvt/freebsd_unbound0.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
77910 Unbound NSEC3-Signed Zones Response Parsing Remote DoS

77909 Unbound Duplicate Resource Record Parsing Remote DoS

Nessus® Vulnerability Scanner

Date Description
2013-11-29 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201311-18.nasl - Type : ACT_GATHER_INFO
2012-01-17 Name : The remote name server is affected by multiple denial of service vulnerabilit...
File : unbound_1_4_14.nasl - Type : ACT_GATHER_INFO
2012-01-12 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-2370.nasl - Type : ACT_GATHER_INFO
2012-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2011-17282.nasl - Type : ACT_GATHER_INFO
2012-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2011-17337.nasl - Type : ACT_GATHER_INFO
2011-12-20 Name : The remote FreeBSD host is missing a security-related update.
File : freebsd_pkg_7ba65bfd2a4011e1b96e00215af774f0.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
Date Informations
2014-02-17 11:37:55
  • Multiple Updates
2013-11-28 13:18:22
  • First insertion