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CVE-2020-8620

Quick assessment

Affected
ISC BIND9
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.

Internet Systems Consortium BIND server 9.15.6版本至9.16.5版本，9.17.0版本至 9.17.3版本中存在安全漏洞，该漏洞源于在通过libuv流量处理TCP流量时，如果对该服务器的TCP端口（用于处理较大的DNS请求（AXFR））发送大量数据包，程序会将长度值传入到服务器，造成断言失败。攻击者可通过向该端口发送大量未认证的数据包利用该漏洞造成拒绝服务。

CVSS 7.5 · High EPSS 3.69% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-8620

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In BIND 9.15.6 -> 9.16.5, 9.17.0 -> 9.17.3, An attacker who can establish a TCP connection with the server and send data on that connection can exploit this to trigger the assertion failure, causing the server to exit.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Internet Systems Consortium BIND server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Internet Systems Consortium BIND server 9.15.6版本至9.16.5版本，9.17.0版本至 9.17.3版本中存在安全漏洞，该漏洞源于在通过libuv流量处理TCP流量时，如果对该服务器的TCP端口（用于处理较大的DNS请求（AXFR））发送大量数据包，程序会将长度值传入到服务器，造成断言失败。攻击者可通过向该端口发送大量未认证的数据包利用该漏洞造成拒绝服务。
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 BIND9 9.15.6 ~ * -

II. Public POCs for CVE-2020-8620

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III. Intelligence Information for CVE-2020-8620

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Vendor Advisories for CVE-2020-8620 (3)

Mailing List Discussions for CVE-2020-8620 (2)

Other References for CVE-2020-8620 (2)

Same Patch Batch · ISC · 2020-08-21 · 5 CVEs total

CVE-2020-8621 7.5 HIGH Attempting QNAME minimization after forwarding can lead to an assertion failure in resolve
CVE-2020-8623 7.5 HIGH A flaw in native PKCS#11 code can lead to a remotely triggerable assertion failure in pk11
CVE-2020-8622 6.5 MEDIUM A truncated TSIG response can lead to an assertion failure
CVE-2020-8624 4.3 MEDIUM update-policy rules of type "subdomain" are enforced incorrectly

IV. Related Vulnerabilities

Same product: BIND9
Same vendor: ISC

V. Comments for CVE-2020-8620

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