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ISC BIND DoS Vulnerability (CVE-2021-25214) - Linux

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

6.8

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:S/C:N/I:N/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

1 year ago

Modified

Modified

1 year ago

Summary

ISC BIND is prone to a denial of service (DoS) vulnerability.

Insight

Insight

Incremental zone transfers (IXFR) provide a way of transferring changed portion(s) of a zone between servers. An IXFR stream containing SOA records with an owner name other than the transferred zone's apex may cause the receiving named server to inadvertently remove the SOA record for the zone in question from the zone database. This leads to an assertion failure when the next SOA refresh query for that zone is made.

Affected Software

Affected Software

BIND 9.8.5 through 9.8.8, 9.9.3 through 9.11.29, 9.12.0 through 9.16.13, 9.9.3-S1 through 9.11.29-S1, 9.16.8-S1 through 9.16.13-S1 and 9.17.0 through 9.17.11.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Update to version 9.11.31, 9.16.15, 9.17.12, 9.11.31-S1, 9.16.15-S1 or later.

Common Vulnerabilities and Exposures (CVE)