CVE-2021-3435— L2CAP: Information leakage 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 v2.4.0版本及之后版本存在安全漏洞，该漏洞源于Zephyr使用未初始化的资源。
Possible ATT&CK Techniques 1 AI
T1213 · Data from Information Repositories
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I. Basic Information for CVE-2021-3435
Vulnerability Information
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Vulnerability Title
L2CAP: Information leakage in le_ecred_conn_req()
Source: CVE Program / CVE List V5
Vulnerability Description
Information leakage in le_ecred_conn_req(). Zephyr versions >= v2.4.0 Use of Uninitialized Resource (CWE-908). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-xhg3-gvj6-4rqh
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 安全漏洞
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 v2.4.0版本及之后版本存在安全漏洞，该漏洞源于Zephyr使用未初始化的资源。
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 | v2.4.0 ~ unspecified | - |
|
II. Public POCs for CVE-2021-3435
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-3435 (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-2021-3434 | 4.9 MEDIUM | L2CAP: Stack based buffer overflow in le_ecred_conn_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 |
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V. Comments for CVE-2021-3435
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