QID 15125

Date Published: 2021-05-10

QID 15125: ISC BIND Broken Inbound Incremental Zone Update Vulnerability

ISC BIND (Berkley Internet Domain Name) is an implementation of DNS protocols.

CVE-2021-25214: A broken inbound incremental zone update (IXFR) can cause named to terminate unexpectedly

Affected software:
BIND 9.8.5 -> 9.8.8
BIND 9.9.3 -> 9.11.29
BIND 9.9.3-S1 -> 9.11.29-S1
BIND 9.16.8-S1 -> 9.16.13-S1
BIND 9.17.0 -> 9.17.11

Patched Versions:
BIND 9.11.22
BIND 9.16.6
BIND 9.17.4
BIND 9.11.22-S1

QID Detection Logic:
This unauthenticated check detects vulnerable systems by fetching the version information from the BIND service.

Successfully exploitation could affects integrity, availability, confidentiality

CVSS V3 rated as High - 6.5 severity.

CVSS V2 rated as Medium - 4 severity.

Solution

Customers are advised to upgrade to the patched version 9.11.31, 9.16.15, 9.17.12, 9.11.31-S1, 9.16.15-S1 or latest release of ISC BIND.Workaround:
Disabling incremental zone transfers (IXFR) by setting request-ixfr no; in the desired configuration block (options, zone, or server) prevents the failing assertion from being evaluated.

Vendor References

BIND CVE-2021-25214 - kb.isc.org/v1/docs/cve-2021-25214

CVEs related to QID 15125

CVE-2021-25214 |

Software Advisories

Advisory ID	Software	Component	Link
BIND CVE-2021-25214			kb.isc.org/v1/docs/cve-2021-25214

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