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CVE-2021-21279— Infinite loop in IPv6 neighbor solicitation processing

Quick assessment

Affected
contiki-ng contiki-ng
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.

Contiki-NG是一套用于下一代IoT（物联网）设备的开源跨平台操作系统。 Contiki-NG 存在安全漏洞，该漏洞源于在4.6之前的版本中，通过在处理IPv6邻居请求(neighbor solicitation, NS)消息时触发无限循环来执行拒绝服务攻击。攻击者可利用该漏洞有效地关闭系统的运行。

CVSS 7.5 · High EPSS 0.98% · P59

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-21279

Vulnerability Information
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Vulnerability Title
Infinite loop in IPv6 neighbor solicitation processing
Source: CVE Program / CVE List V5
Vulnerability Description
Contiki-NG is an open-source, cross-platform operating system for internet of things devices. In verions prior to 4.6, an attacker can perform a denial-of-service attack by triggering an infinite loop in the processing of IPv6 neighbor solicitation (NS) messages. This type of attack can effectively shut down the operation of the system because of the cooperative scheduling used for the main parts of Contiki-NG and its communication stack. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.
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
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Contiki-NG 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Contiki-NG是一套用于下一代IoT（物联网）设备的开源跨平台操作系统。 Contiki-NG 存在安全漏洞，该漏洞源于在4.6之前的版本中，通过在处理IPv6邻居请求(neighbor solicitation, NS)消息时触发无限循环来执行拒绝服务攻击。攻击者可利用该漏洞有效地关闭系统的运行。
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
contiki-ng contiki-ng < 4.6 -

II. Public POCs for CVE-2021-21279

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III. Intelligence Information for CVE-2021-21279

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Vendor Advisories for CVE-2021-21279 (1)

Same Patch Batch · contiki-ng · 2021-06-18 · 6 CVEs total

CVE-2021-21280 8.6 HIGH Out-of-bounds write when processing 6LoWPAN extension headers
CVE-2021-21282 8.6 HIGH Buffer overflow in RPL source routing header processing
CVE-2021-21257 8.2 HIGH Out-of-bounds write in RPL-Classic and RPL-Lite
CVE-2021-21410 8.2 HIGH Out-of-bounds read in the 6LoWPAN implementation
CVE-2021-21281 7.0 HIGH Buffer overflow due to unvalidated TCP data offset

IV. Related Vulnerabilities

Same product: contiki-ng
Same vendor: contiki-ng
Same weakness: CWE-835

V. Comments for CVE-2021-21279

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