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CVE-2019-6471— A race condition when discarding malformed packets can cause BIND to exit with an assertion failure

Quick assessment

Affected
ISC BIND 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND中存在竞争条件问题漏洞。该漏洞源于网络系统或产品在运行过程中，并发代码需要互斥地访问共享资源时，对于并发访问的处理不当。以下产品及版本受到影响：BIND 9.11.0版本至9.11.7，9.12.0版本至9.12.4-P1版本，9.14.0版本至9.14.2版本，BIND 9.13版本（development branch），BIND 9.15（development branch），BIND Supported Prev

AI Predicted 5.3 Difficulty: Moderate EPSS 3.30% · P88
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I. Basic Information for CVE-2019-6471

Vulnerability Information
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Vulnerability Title
A race condition when discarding malformed packets can cause BIND to exit with an assertion failure
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition which may occur when discarding malformed packets can result in BIND exiting due to a REQUIRE assertion failure in dispatch.c. Versions affected: BIND 9.11.0 -> 9.11.7, 9.12.0 -> 9.12.4-P1, 9.14.0 -> 9.14.2. Also all releases of the BIND 9.13 development branch and version 9.15.0 of the BIND 9.15 development branch and BIND Supported Preview Edition versions 9.11.3-S1 -> 9.11.7-S1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 ISC BIND中存在竞争条件问题漏洞。该漏洞源于网络系统或产品在运行过程中，并发代码需要互斥地访问共享资源时，对于并发访问的处理不当。以下产品及版本受到影响：BIND 9.11.0版本至9.11.7，9.12.0版本至9.12.4-P1版本，9.14.0版本至9.14.2版本，BIND 9.13版本（development branch），BIND 9.15（development branch），BIND Supported Prev
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 BIND 9.11.0 -> 9.11.7, 9.12.0 -> 9.12.4-P1, 9.14.0 -> 9.14.2. Also all releases of the BIND 9.13 development branch and version 9.15.0 of the BIND 9.15 development branch and BIND Supported Preview Edition versions 9.11.3-S1 -> 9.11.7-S1. -

II. Public POCs for CVE-2019-6471

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III. Intelligence Information for CVE-2019-6471

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Vendor Advisories for CVE-2019-6471 (1)

Other References for CVE-2019-6471 (1)

Same Patch Batch · ISC · 2019-10-09 · 9 CVEs total

CVE-2019-6469 BIND Supported Preview Edition can exit with an assertion failure if ECS is in use
CVE-2018-5732 A specially constructed response from a malicious server can cause a buffer overflow in dh
CVE-2018-5743 Limiting simultaneous TCP clients was ineffective
CVE-2018-5744 A specially crafted packet can cause named to leak memory
CVE-2018-5745 An assertion failure can occur if a trust anchor rolls over to an unsupported key algorith
CVE-2019-6465 Zone transfer controls for writable DLZ zones were not effective
CVE-2019-6467 An error in the nxdomain redirect feature can cause BIND to exit with an INSIST assertion
CVE-2019-6468 BIND Supported Preview Edition can exit with an assertion failure if nxdomain-redirect is

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC

V. Comments for CVE-2019-6471

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