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CVE-2021-21410— Out-of-bounds read in the 6LoWPAN implementation

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 存在缓冲区错误漏洞，该漏洞源于在4.6及以上版本的设备的6LoWPAN报文会触发读越界。攻击者可利用该漏洞构造一个压缩的6LoWPAN包，它将读取比包缓冲区中可用的字节更多的字节。

CVSS 8.2 · High EPSS 1.23% · P66

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21410

Vulnerability Information
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Vulnerability Title
Out-of-bounds read in the 6LoWPAN implementation
Source: CVE Program / CVE List V5
Vulnerability Description
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. 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:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Contiki-NG 缓冲区错误漏洞
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 存在缓冲区错误漏洞，该漏洞源于在4.6及以上版本的设备的6LoWPAN报文会触发读越界。攻击者可利用该漏洞构造一个压缩的6LoWPAN包，它将读取比包缓冲区中可用的字节更多的字节。
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-2021-21410

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III. Intelligence Information for CVE-2021-21410

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Vendor Advisories for CVE-2021-21410 (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-2021-21279 7.5 HIGH Infinite loop in IPv6 neighbor solicitation processing
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-125

V. Comments for CVE-2021-21410

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