CVE-2023-43636— EVE OS 数据伪造问题漏洞
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measured boot机制不会验证整个rootfs，导致攻击者可以编辑文件系统并获得对系统的控制权。
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一、 漏洞 CVE-2023-43636 基础信息
漏洞信息
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Vulnerability Title
Rootfs Not Protected
来源: CVE Program / CVE List V5
Vulnerability Description
In EVE OS, the “measured boot” mechanism prevents a compromised device from accessing
the encrypted data located in the vault.
As per the “measured boot” design, the PCR values calculated at different stages of the boot
process will change if any of their respective parts are changed.
This includes, among other things, the configuration of the bios, grub, the kernel cmdline,
initrd, and more.
However, this mechanism does not validate the entire rootfs, so an attacker can edit the
filesystem and gain control over the system.
As the default filesystem used by EVE OS is squashfs, this is somewhat harder than an ext4,
which is easily changeable.
This will not stop an attacker, as an attacker can repackage the squashfs with their changes
in it and replace the partition altogether.
This can also be done directly on the device, as the “003-storage-init” container contains the
“mksquashfs” and “unsquashfs” binaries (with the corresponding libs).
An attacker can gain full control over the device without changing the PCR values, thus 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
对数据真实性的验证不充分
来源: CVE Program / CVE List V5
Vulnerability Title
EVE OS 数据伪造问题漏洞
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measured boot机制不会验证整个rootfs，导致攻击者可以编辑文件系统并获得对系统的控制权。
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 | 9.0.0 ~ 9.5.0 | - |
|
二、漏洞 CVE-2023-43636 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-43636 其他参考 (1)
同批安全公告 · LF-Edge, Zededa · 2023-09-20 · 共 3 条
| CVE-2023-43635 | 8.8 HIGH | EVE OS 加密问题漏洞 |
| CVE-2023-43630 | 8.8 HIGH | EVE OS 安全漏洞 |