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CVE-2020-8616

Publication date 19 May 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.6 · High

Score breakdown

A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.

Status

Package Ubuntu Release Status
bind9 20.04 LTS focal
Fixed 1:9.16.1-0ubuntu2.1
19.10 eoan
Fixed 1:9.11.5.P4+dfsg-5.1ubuntu2.2
18.04 LTS bionic
Fixed 1:9.11.3+dfsg-1ubuntu1.12
16.04 LTS xenial
Fixed 1:9.10.3.dfsg.P4-8ubuntu1.16
14.04 LTS trusty

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Severity score breakdown

Parameter Value
Base score 8.6 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Changed
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references