低危 nextcloud nextcloud_server 对外部实体的文件或目录可访问
CVE编号
CVE-2021-32688利用情况
暂无补丁情况
官方补丁披露时间
2021-07-12漏洞描述
Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。受影响软件情况
| # | 类型 | 厂商 | 产品 | 版本 | 影响面 | ||||
| 1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 运行在以下环境 | |||||||||
| 应用 | nextcloud | nextcloud_server | * | Up to (excluding) 19.0.13 | |||||
| 运行在以下环境 | |||||||||
| 应用 | nextcloud | nextcloud_server | * | From (including) 20.0.0 | Up to (excluding) 20.0.11 | ||||
| 运行在以下环境 | |||||||||
| 应用 | nextcloud | nextcloud_server | * | From (including) 21.0.0 | Up to (excluding) 21.0.3 | ||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_33 | nextcloud | * | Up to (excluding) 19.0.13-1.fc33 | |||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_33_Modular | nextcloud | * | Up to (excluding) nextcloud_21-3320210712182939.601d93de | |||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_34 | nextcloud | * | Up to (excluding) 20.0.11-1.fc34 | |||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_34_Modular | nextcloud | * | Up to (excluding) nextcloud_20-3420210712182853.058368ca | |||||
| 运行在以下环境 | |||||||||
| 系统 | fedora_Epel_8_Modular | nextcloud | * | Up to (excluding) nextcloud_21-820210712182939.9edba152 | |||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.2 | nextcloud | * | Up to (excluding) 20.0.11-bp153.2.3.1 | |||||
| 运行在以下环境 | |||||||||
| 系统 | opensuse_Leap_15.3 | nextcloud | * | Up to (excluding) 20.0.11-bp153.2.3.1 | |||||
- 攻击路径 远程
- 攻击复杂度 复杂
- 权限要求 无需权限
- 影响范围 有限影响
- EXP成熟度 未验证
- 补丁情况 官方补丁
- 数据保密性 无影响
- 数据完整性 无影响
- 服务器危害 无影响
- 全网数量 N/A
| CWE-ID | 漏洞类型 |
| CWE-285 | 授权机制不恰当 |
| CWE-552 | 对外部实体的文件或目录可访问 |
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