CVE-2023-43633— EVE OS 安全漏洞
一分钟漏洞结论
影响对象
LF-Edge, Zededa EVE OS
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
EVE OS是IF Edge开源的一个用于分布式边缘计算的通用、开放的基于 Linux 的操作系统。 EVE OS存在安全漏洞，该漏洞源于Pillar eve容器允许攻击者在不触发测量启动机制的前提下解锁调试功能。
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一、 漏洞 CVE-2023-43633 基础信息
漏洞信息
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Vulnerability Title
Debug Functions Unlockable Without Triggering Measured Boot
来源: CVE Program / CVE List V5
Vulnerability Description
On boot, the Pillar eve container checks for the existence and content of
“/config/GlobalConfig/global.json”.
If the file exists, it overrides the existing configuration on the device on boot.
This allows an attacker to change the system’s configuration, which also includes some
debug functions.
This could be used to unlock the ssh with custom “authorized_keys” via the
“debug.enable.ssh” key, similar to the “authorized_keys” finding that was noted before.
Other usages include unlocking the usb to enable the keyboard via the “debug.enable.usb”
key, allowing VNC access via the “app.allow.vnc” key, and more.
An attacker could easily enable these debug functionalities without triggering the “measured
boot” mechanism implemented by EVE OS, and without marking the device as “UUD”
(“Unknown Update Detected”).
This is because the “/config” partition is not protected by “measured boot”, it is mutable and it
is not encrypted in any way.
An attacker can gain full control over the device without changing the PCR values, thereby not
triggering the “measured boot” mechanism, and having full access to the vault.
Note:
This issue was partially fixed in these commits (after disclosure to Zededa), where the config
partition measurement was added to PCR13:
• aa3501d6c57206ced222c33aea15a9169d629141
• 5fef4d92e75838cc78010edaed5247dfbdae1889.
This issue was made viable in version 9.0.0 when the calculation was moved to PCR14 but it was not included in the measured boot.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
来源: CVE Program / CVE List V5
Vulnerability Title
EVE OS 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
EVE OS是IF Edge开源的一个用于分布式边缘计算的通用、开放的基于 Linux 的操作系统。 EVE OS存在安全漏洞，该漏洞源于Pillar eve容器允许攻击者在不触发测量启动机制的前提下解锁调试功能。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| LF-Edge, Zededa | EVE OS | 0 ~ 8.6.0 | - |
|
二、漏洞 CVE-2023-43633 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-43633 其他参考 (1)
同批安全公告 · LF-Edge, Zededa · 2023-09-21 · 共 5 条
| CVE-2023-43632 | 9.0 CRITICAL | EVE OS 安全漏洞 |
| CVE-2023-43634 | 8.8 HIGH | EVE OS 安全漏洞 |
| CVE-2023-43631 | 8.8 HIGH | EVE OS 安全漏洞 |
| CVE-2023-43637 | 7.8 HIGH | EVE OS 信任管理问题漏洞 |