CVE-2023-43635— EVE OS 加密问题漏洞
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，该漏洞源于使用了不安全的SHA1 PCR算法来密封保险库密钥，导致解封密钥复杂度降低。
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一、 漏洞 CVE-2023-43635 基础信息
漏洞信息
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Vulnerability Title
Vault Key Sealed With SHA1 PCRs
来源: CVE Program / CVE List V5
Vulnerability Description
Vault Key Sealed With SHA1 PCRs
The measured boot solution implemented in EVE OS leans on a PCR locking mechanism.
Different parts of the system update different PCR values in the TPM, resulting in a unique
value for each PCR entry.
These PCRs are then used in order to seal/unseal a key from the TPM which is used to
encrypt/decrypt the “vault” directory.
This “vault” directory is the most sensitive point in the system and as such, its content should
be protected.
This mechanism is noted in Zededa’s documentation as the “measured boot” mechanism,
designed to protect said “vault”.
The code that’s responsible for generating and fetching the key from the TPM assumes that
SHA256 PCRs are used in order to seal/unseal the key, and as such their presence is being
checked.
The issue here is that the key is not sealed using SHA256 PCRs, but using SHA1 PCRs.
This leads to several issues:
• Machines that have their SHA256 PCRs enabled but SHA1 PCRs disabled, as well
as not sealing their keys at all, meaning the “vault” is not protected from an attacker.
• SHA1 is considered insecure and reduces the complexity level required to unseal the
key in machines which have their SHA1 PCRs enabled.
An attacker can very easily retrieve the contents of the “vault”, which will effectively render
the “measured boot” mechanism meaningless.
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 加密问题漏洞
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，该漏洞源于使用了不安全的SHA1 PCR算法来密封保险库密钥，导致解封密钥复杂度降低。
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 ~ 9.5.0 | - |
|
二、漏洞 CVE-2023-43635 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2023-43635 其他参考 (1)
同批安全公告 · LF-Edge, Zededa · 2023-09-20 · 共 3 条
| CVE-2023-43636 | 8.8 HIGH | EVE OS 数据伪造问题漏洞 |
| CVE-2023-43630 | 8.8 HIGH | EVE OS 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2023-43635
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