一、 漏洞 CVE-2021-29447 基础信息
漏洞信息
# WordPress在运行PHP 8时可发生授权XXE攻击
## 漏洞概述
WordPress 是一个开源内容管理系统(CMS)。具有上传文件权限的用户（如作者）可以通过媒体库中的 XML 解析问题来发动 XXE 攻击。
## 影响版本
- WordPress 5.7.0 及以下版本
## 漏洞细节
漏洞利用需要 WordPress 安装使用 PHP 8。攻击者可以利用媒体库中的 XML 解析漏洞发动 XXE 攻击，并访问内部文件。
## 漏洞影响
成功发动 XXE 攻击可以访问 WordPress 安装中的内部文件。
## 修复建议
此漏洞已在 WordPress 5.7.1 版本中修复，并通过小版本更新修复了其他受影响的版本。强烈建议启用自动更新功能。
神龙判断
是否为 Web 类漏洞： 是
判断理由：
是。这个漏洞影响WordPress的Media Library，利用XML解析问题，具有文件上传权限的用户可以发起XXE（XML External Entity）攻击，可能导致访问内部文件。该漏洞需要WordPress使用PHP 8，并已在WordPress 5.7.1版本中修复。
提示
尽管我们采用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。
神龙会尽力确保数据准确，但也请结合实际情况进行甄别与判断。
神龙祝您一切顺利！
神龙会尽力确保数据准确，但也请结合实际情况进行甄别与判断。
神龙祝您一切顺利！
漏洞标题
WordPress Authenticated XXE attack when installation is running PHP 8
来源：美国国家漏洞数据库 NVD
漏洞描述信息
Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.
来源：美国国家漏洞数据库 NVD
CVSS信息
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
来源：美国国家漏洞数据库 NVD
漏洞类别
XML外部实体引用的不恰当限制(XXE)
来源：美国国家漏洞数据库 NVD
漏洞标题
WordPress 代码问题漏洞
来源：中国国家信息安全漏洞库 CNNVD
漏洞描述信息
WordPress是WordPress（Wordpress）基金会的一套使用PHP语言开发的博客平台。该平台支持在PHP和MySQL的服务器上架设个人博客网站。 WordPress 存在代码问题漏洞，攻击者可利用该漏洞在成功的XXE攻击中可以访问内部文件。
来源：中国国家信息安全漏洞库 CNNVD
CVSS信息
N/A
来源：中国国家信息安全漏洞库 CNNVD
漏洞类别
代码问题
来源：中国国家信息安全漏洞库 CNNVD
二、漏洞 CVE-2021-29447 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|---|---|---|
| 1 | WordPress - Authenticated XXE (CVE-2021-29447) | https://github.com/motikan2010/CVE-2021-29447 | POC详情 |
| 2 | WordPress XXE vulnerability | https://github.com/Vulnmachines/wordpress_cve-2021-29447 | POC详情 |
| 3 | Wordpress XXE injection 구축 자동화 및 PoC | https://github.com/dnr6419/CVE-2021-29447 | POC详情 |
| 4 | None | https://github.com/AssassinUKG/CVE-2021-29447 | POC详情 |
| 5 | None | https://github.com/b-abderrahmane/CVE-2021-29447-POC | POC详情 |
| 6 | Arbitrary file read controller based on CVE-2021-29447 | https://github.com/elf1337/blind-xxe-controller-CVE-2021-29447 | POC详情 |
| 7 | Proof of Concept for CVE-2021-29447 written in Python | https://github.com/Val-Resh/CVE-2021-29447-POC | POC详情 |
| 8 | Exploit WordPress Media Library XML External Entity Injection (XXE) to exfiltrate files. | https://github.com/M3l0nPan/wordpress-cve-2021-29447 | POC详情 |
| 9 | None | https://github.com/mega8bit/exploit_cve-2021-29447 | POC详情 |
| 10 | A Golang program to automate the execution of CVE-2021-29447 | https://github.com/thomas-osgood/CVE-2021-29447 | POC详情 |
| 11 | None | https://github.com/Abdulazizalsewedy/CVE-2021-29447 | POC详情 |
| 12 | None | https://github.com/G01d3nW01f/CVE-2021-29447 | POC详情 |
| 13 | CVE-2021-29447 - Authenticated XXE Injection - WordPress < 5.7.1 & PHP > 8 | https://github.com/viardant/CVE-2021-29447 | POC详情 |
| 14 | A proof of concept exploit for a wordpress 5.6 media library vulnerability | https://github.com/0xRar/CVE-2021-29447-PoC | POC详情 |
| 15 | None | https://github.com/andyhsu024/CVE-2021-29447 | POC详情 |
| 16 | None | https://github.com/specializzazione-cyber-security/demo-CVE-2021-29447-lezione | POC详情 |
| 17 | PoC for CVE-2021-29447 | https://github.com/magicrc/CVE-2021-29447 | POC详情 |
| 18 | POC to exploit WordPress 5.6-5.7 (PHP 8+) Authenticated XXE Injection. | https://github.com/Tea-On/CVE-2021-29447-Authenticated-XXE-WordPress-5.6-5.7 | POC详情 |
| 19 | The objective is to conduct a full-scale security assessment of a WordPress-based web application, culminating in a complete server compromise. The assessment will focus on exploiting a specific, real-world vulnerability (CVE-2021-29447) to achieve initial access. | https://github.com/ArtemCyberLab/Project-Project-Chimera-Exploiting-a-Modern-WordPress-XXE-to-Pillage-Secrets- | POC详情 |
| 20 | A XXE payload generator | https://github.com/0xricksanchez/CVE-2021-29447 | POC详情 |
| 21 | This repo describes about cve-2021-29447 and a small script for exploiting automatically | https://github.com/davids52/cve-2021-29447_auto-script | POC详情 |
| 22 | None | https://github.com/rdana55/CVE-2021-29447-PoC | POC详情 |
三、漏洞 CVE-2021-29447 的情报信息
标题： Packet Storm -- 🔗来源链接
标签：x_refsource_MISC
神龙速读：- **Agreement to Terms**: Website users must agree to the Terms of Service, which are a legally binding agreement. - **User Registration**: User registration may be required, with requirements for accuracy and compliance with terms. - **Prohibited Activities**: Users are prohibited from acting maliciously against the site or its users. - **User-Generated Content**: Users agree to license content to the site, with the site retaining rights to contributions. - **Privacy Policy**: The Privacy Policy is incorporated into the Terms of Service. - **Dispute Resolution**: Disputes may be resolved through binding arbitration. - **Limitations of Liability**: The site is not liable for damages of any kind. - **Indemnification**: Users must indemnify the site against legal actions arising from their use of the site. - **Miscellaneous**: General provisions including severability, interpretation, and assignment of the agreement.
- https://wordpress.org/news/category/security/x_refsource_MISC
- https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rv47-pc52-qrhhx_refsource_CONFIRM
- http://packetstormsecurity.com/files/163148/XML-External-Entity-Via-MP3-File-Upload-On-WordPress.htmlx_refsource_MISC
- https://blog.sonarsource.com/wordpress-xxe-security-vulnerability/x_refsource_MISC
- https://www.debian.org/security/2021/dsa-4896vendor-advisoryx_refsource_DEBIAN
- https://lists.debian.org/debian-lts-announce/2021/04/msg00017.htmlmailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2021-29447
四、漏洞 CVE-2021-29447 的评论
暂无评论