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Resource Exhaustion Affecting bind9 package, versions <1:9.9.5.dfsg-9+deb8u19

0.0
high

Snyk CVSS

    Attack Complexity Low
    Scope Changed
    Availability High

    Threat Intelligence

    EPSS 2.34% (90th percentile)
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NVD
8.6 high
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SUSE
8.6 high
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Red Hat
8.6 high

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  • Snyk ID SNYK-DEBIAN8-BIND9-569635
  • published 19 May 2020
  • disclosed 19 May 2020
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Introduced: 19 May 2020

CVE-2020-8616 Open this link in a new tab
CWE-400 Open this link in a new tab

How to fix?

Upgrade Debian:8 bind9 to version 1:9.9.5.dfsg-9+deb8u19 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bind9 package and not the bind9 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

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.

References