Executive Summary

Title bind9 security update
Name DSA-4689 First vendor Publication 2020-05-19
Vendor Debian Last vendor Modification 2020-05-19
Severity (Vendor) N/A Revision 1

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Overall CVSS Score 8.6
Base Score 8.6 Environmental Score 8.6
impact SubScore 4 Temporal Score 8.6
Exploitabality Sub Score 3.9
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Changed Confidentiality Impact None
Integrity Impact None Availability Impact High
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:P)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Several vulnerabilities were discovered in BIND, a DNS server implementation.


It was discovered that TCP-pipelined queries can bypass tcp-client limits resulting in denial of service.


It was discovered that BIND does not sufficiently limit the number of fetches performed when processing referrals. An attacker can take advantage of this flaw to cause a denial of service (performance degradation) or use the recursing server in a reflection attack with a high amplification factor.


It was discovered that a logic error in the code which checks TSIG validity can be used to trigger an assertion failure, resulting in denial of service.

For the oldstable distribution (stretch), these problems have been fixed in version 1:9.10.3.dfsg.P4-12.3+deb9u6.

For the stable distribution (buster), these problems have been fixed in version 1:9.11.5.P4+dfsg-5.1+deb10u1.

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/bind9

Original Source

Url : http://www.debian.org/security/2020/dsa-4689

CWE : Common Weakness Enumeration

% Id Name
67 % CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
33 % CWE-617 Reachable Assertion

CPE : Common Platform Enumeration

Application 652
Os 2
Os 2

Snort® IPS/IDS

Date Description
2020-09-02 BIND DNS server TSIG denial of service attempt
RuleID : 54630 - Revision : 1 - Type : PROTOCOL-DNS

Alert History

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Date Informations
2020-05-23 13:03:43
  • Multiple Updates
2020-05-20 00:17:42
  • First insertion