Uncontrolled Recursion Affecting unbound package, versions <1.6.7-1ubuntu2.3


Severity

Recommended
medium

Based on Ubuntu security rating

    Threat Intelligence

    EPSS
    1.54% (88th percentile)

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  • Snyk ID SNYK-UBUNTU1804-UNBOUND-570214
  • published 19 May 2020
  • disclosed 19 May 2020

How to fix?

Upgrade Ubuntu:18.04 unbound to version 1.6.7-1ubuntu2.3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound package and not the unbound package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.

CVSS Scores

version 3.1
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NVD

7.5 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
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Red Hat

7.5 high
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SUSE

8.6 high