CVE-2026-11386— Canonical ubuntu-advantage-tools 输入验证错误漏洞
一分钟漏洞结论
影响对象
Canonical ubuntu-pro-client (ubuntu-advantage-tools)
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。
Canonical ubuntu-advantage-tools是英国Canonical公司的一款系统管理工具套件。 Canonical ubuntu-advantage-tools存在输入验证错误漏洞，该漏洞源于输入验证和注入问题。客户端使用来自合同服务器的数据直接构建APT源文件，利用Python的str.format()写入文件时未进行转义、验证或换行字符过滤，成功注入任意deb配置行到root拥有的APT源中。结合未经验证的additionalPackages[]字段，可能导致攻击者控制合同响应，
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Canonical | Ubuntu 14.04 LTS | 19.7ubuntu0.1 |
unaffected |
| Canonical | Ubuntu 16.04 LTS | 37.1ubuntu0~16.04.1 |
unaffected |
| Canonical | Ubuntu 18.04 LTS | 37.1ubuntu0~18.04.1 |
unaffected |
| Canonical | Ubuntu 20.04 LTS | 37.1ubuntu0~20.04.1 |
unaffected |
| Canonical | Ubuntu 22.04 LTS | 37.2ubuntu~22.04.1 |
unaffected |
| Canonical | Ubuntu 24.04 LTS | 37.2ubuntu~24.04.1 |
unaffected |
| Canonical | Ubuntu 26.04 LTS | 37.2ubuntu0.1 |
unaffected |
| Canonical | ubuntu-pro-client (ubuntu-advantage-tools) | < 37.3 |
affected |
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一、 漏洞 CVE-2026-11386 基础信息
漏洞信息
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Vulnerability Title
ubuntu-pro-client Input Validation Vulnerability Leading to Arbitrary APT Directive Injection and Remote Code Execution
来源: CVE Program / CVE List V5
Vulnerability Description
An input validation and injection vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client constructs APT source files (such as /etc/apt/sources.list.d/ubuntu-.list or their DEB822 equivalents) using data received directly from the contract server response via the directives.suites[] and directives.aptURL fields. Because the client utilizes Python's str.format() to write these files without performing escaping, validation, or newline character filtering, a malicious or tampered contract response containing embedded newline (\n) characters can successfully inject arbitrary, attacker-controlled deb configuration lines into root-owned APT sources. When combined with the unvalidated additionalPackages[] field—which is passed positionally into a root-executed apt-get install command—an attacker capable of spoofing or manipulating the contract response (e.g., via a compromised internal infrastructure, an intercepted connection utilizing a trusted CA, or local logical bugs) can force the client to fetch and install malicious packages. This ultimately leads to arbitrary code execution with root privileges on the affected system. This component is preinstalled on supported Ubuntu Server releases and auto-attaches by default on cloud provider Ubuntu Pro images.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
来源: CVE Program / CVE List V5
Vulnerability Title
Canonical ubuntu-advantage-tools 输入验证错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Canonical ubuntu-advantage-tools是英国Canonical公司的一款系统管理工具套件。 Canonical ubuntu-advantage-tools存在输入验证错误漏洞，该漏洞源于输入验证和注入问题。客户端使用来自合同服务器的数据直接构建APT源文件，利用Python的str.format()写入文件时未进行转义、验证或换行字符过滤，成功注入任意deb配置行到root拥有的APT源中。结合未经验证的additionalPackages[]字段，可能导致攻击者控制合同响应，
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 |
|---|---|---|---|---|
| Canonical | ubuntu-pro-client (ubuntu-advantage-tools) | 0 ~ 37.3 | - |
|
| Canonical | Ubuntu 26.04 LTS | 37.2ubuntu0.1 | - |
|
| Canonical | Ubuntu 24.04 LTS | 37.2ubuntu~24.04.1 | - |
|
| Canonical | Ubuntu 22.04 LTS | 37.2ubuntu~22.04.1 | - |
|
| Canonical | Ubuntu 20.04 LTS | 37.1ubuntu0~20.04.1 | - |
|
| Canonical | Ubuntu 18.04 LTS | 37.1ubuntu0~18.04.1 | - |
|
| Canonical | Ubuntu 16.04 LTS | 37.1ubuntu0~16.04.1 | - |
|
| Canonical | Ubuntu 14.04 LTS | 19.7ubuntu0.1 | - |
|
二、漏洞 CVE-2026-11386 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-11386 厂商安全公告 (1)
-
🔗 504 Gateway Timeout vdb-entry
同批安全公告 · Canonical · 2026-07-16 · 共 3 条
| CVE-2026-9494 | 5.5 MEDIUM | Canonical ubuntu-advantage-tools 信息泄露漏洞 |
| CVE-2026-12391 | 5.0 MEDIUM | Canonical ubuntu-advantage-tools 后置链接漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-11386
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