PT-2021-3136 · Isc+10 · Bind+10
Greg Kuechle
·
Published
2021-04-28
·
Updated
2026-01-29
·
CVE-2021-25214
CVSS v2.0
6.8
Medium
| Vector | AV:N/AC:L/Au:S/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
BIND versions 9.8.5 through 9.8.8
BIND versions 9.9.3 through 9.11.29
BIND versions 9.12.0 through 9.16.13
BIND 9 Supported Preview Edition versions 9.9.3-S1 through 9.11.29-S1
BIND 9 Supported Preview Edition versions 9.16.8-S1 through 9.16.13-S1
BIND 9.17 development branch versions 9.17.0 through 9.17.11
Description
The issue is related to insufficient use of the
assert() function in the BIND server, which can be exploited by a remote attacker to cause a denial of service using a specially crafted request. When a vulnerable version of named receives a malformed IXFR, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.Recommendations
For BIND versions 9.8.5 through 9.8.8, update to a version outside of this range to resolve the issue.
For BIND versions 9.9.3 through 9.11.29, update to a version outside of this range to resolve the issue.
For BIND versions 9.12.0 through 9.16.13, update to a version outside of this range to resolve the issue.
For BIND 9 Supported Preview Edition versions 9.9.3-S1 through 9.11.29-S1, update to a version outside of this range to resolve the issue.
For BIND 9 Supported Preview Edition versions 9.16.8-S1 through 9.16.13-S1, update to a version outside of this range to resolve the issue.
For BIND 9.17 development branch versions 9.17.0 through 9.17.11, update to a version outside of this range to resolve the issue.
As a temporary workaround, consider restricting the use of the
named process to minimize the risk of exploitation.Fix
Assertion Failure
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Bind
Bind Server
Centos
Linuxmint
Red Hat
Rocky Linux
Suse
Ubuntu