CVE-2020-8616 BIND does not sufficiently limit the number of fetches performed when processing referrals
Attackers can degrade performance or launch reflection attacks by causing a recursing BIND server to issue excessive fetches via crafted referrals.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8616?
CVE-2020-8616 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 19 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2020-8616?
It affects 2 products.
Linux distribution packages (34)
bind Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-chroot Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-debuginfo Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-devel Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-export-devel Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-export-libs Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-libs Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-libs-lite Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-license Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-lite-devel Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11 Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11-devel Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11-libs Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11-utils Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-sdb Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-sdb-chroot Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-utils Red Hat:rhel_eus:7.7::computenode | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-chroot Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-debuginfo Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-devel Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-export-devel Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-export-libs Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-libs Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-libs-lite Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-license Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-lite-devel Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11 Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11-devel Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11-libs Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-pkcs11-utils Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-sdb Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-sdb-chroot Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
bind-utils Red Hat:rhel_eus:7.7::server | All versions | 32:9.11.4-9.P2.el7_7.2 |
Products include Debian Debian Linux, Isc Bind.
How do I fix CVE-2020-8616?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-8616 being exploited?
There is no known exploitation of CVE-2020-8616 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2020-8616, DEBIAN-CVE-2020-8616, GHSA-rc96-hg8v-6p4g, RHSA-2020:3272, UBUNTU-CVE-2020-8616.