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CVE-2020-8622

MEDIUMCVSS 6.5/10EPSS 5.54%

Last modified

CVE-2020-8622 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.. EPSS estimates a 5.54% chance of exploitation in the next 30 days.

Description

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Metrics

CVSS 3.1
6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
5.54%

91.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
IscBind>= 9.0.0, <= 9.11.21—
IscBind>= 9.12.0, <= 9.16.5—
IscBind>= 9.17.0, <= 9.17.3—
IscBind9.9.3S1
IscBind9.11.21S1
FedoraprojectFedora31—
FedoraprojectFedora32—
DebianDebian Linux9.0—
DebianDebian Linux10.0—
CanonicalUbuntu Linux12.04—
CanonicalUbuntu Linux14.04—
CanonicalUbuntu Linux16.04—
CanonicalUbuntu Linux18.04—
CanonicalUbuntu Linux20.04—
NetappSteelstore Cloud Integrated StorageAll versions—
OpensuseLeap15.1—
OpensuseLeap15.2—
SynologyDns Server< 2.2.2-5028—
OracleCommunications Diameter Signaling Router>= 8.0.0, <= 8.5.0—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-8622?
In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.
How severe is CVE-2020-8622?
CVE-2020-8622 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 5.54% probability of exploitation in the next 30 days.
How do I fix CVE-2020-8622?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8622?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST