CVE-2021-3434— L2CAP: Stack based buffer overflow in le_ecred_conn_req()
Quick assessment
Affected
zephyrproject-rtos zephyr
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.
Zephyr是Zephyr Project开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr v2.5.0版本及之后版本存在安全漏洞，该漏洞源于 le_ecred_conn_req() 中存在基于堆栈的缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-3434
Vulnerability Information
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Vulnerability Title
L2CAP: Stack based buffer overflow in le_ecred_conn_req()
Source: CVE Program / CVE List V5
Vulnerability Description
Stack based buffer overflow in le_ecred_conn_req(). Zephyr versions >= v2.5.0 Stack-based Buffer Overflow (CWE-121). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8w87-6rfp-cfrm
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr Project开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr v2.5.0版本及之后版本存在安全漏洞，该漏洞源于 le_ecred_conn_req() 中存在基于堆栈的缓冲区溢出。
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 |
|---|---|---|---|---|
| zephyrproject-rtos | zephyr | v2.5.0 ~ unspecified | - |
|
II. Public POCs for CVE-2021-3434
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-3434 (1)
Same Patch Batch · zephyrproject-rtos · 2022-06-28 · 6 CVEs total
| CVE-2021-3430 | 6.5 MEDIUM | BT: Assertion failure on repeated LL_CONNECTION_PARAM_REQ |
| CVE-2021-3431 | 4.3 MEDIUM | BT: Assertion failure on repeated LL_FEATURE_REQ |
| CVE-2021-3432 | 4.3 MEDIUM | BT: Invalid interval in CONNECT_IND leads to Division by Zero |
| CVE-2021-3433 | 4.0 MEDIUM | BT: Invalid channel map in CONNECT_IND results to Deadlock |
| CVE-2021-3435 | 4.0 MEDIUM | L2CAP: Information leakage in le_ecred_conn_req() |
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V. Comments for CVE-2021-3434
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