CVE-2020-8616BIND does not sufficiently limit the number of fetches performed when processing referrals

Description

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://kb.isc.org/docs/cve-2020-8616
• http://www.nxnsattack.com
• [oss-security] 20200519 Two vulnerabilities disclosed in BIND (CVE-2020-8616 and CVE-2020-8617) mailing-list
• DSA-4689 vendor-advisory
• https://security.netapp.com/advisory/ntap-20200522-0002/
• USN-4365-2 vendor-advisory
• https://www.synology.com/security/advisory/Synology_SA_20_12
• USN-4365-1 vendor-advisory
• [debian-lts-announce] 20200530 [SECURITY] [DLA 2227-1] bind9 security update mailing-list
• FEDORA-2020-2d89cbcfd9 vendor-advisory
• FEDORA-2020-f9dcd4e9d5 vendor-advisory
• openSUSE-SU-2020:1699 vendor-advisory
• openSUSE-SU-2020:1701 vendor-advisory