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Python漏洞导致Windows系统越界写入

  • 2026-07-01 04:12:18
Python漏洞导致Windows系统越界写入

在Python的asyncio模块中发现了一个高危安全漏洞,该漏洞存在于Windows系统上,可能允许攻击者向已分配内存缓冲区的边界之外写入数据。

该漏洞被追踪为CVE-2026-3298,由Python安全开发者Seth Larson于2026年4月21日通过官方Python安全公告邮件列表公开披露。

该漏洞存在于asyncio.ProactorEventLoop的sock_recvfrom_into()方法中,这是一个Windows特定的事件循环实现,用于异步I/O操作。

根本原因是当使用可选的nbytes参数时,数据缓冲区缺少边界检查。

当网络响应超过预分配的缓冲区大小时,Python无法强制执行大小限制,导致多余数据覆盖相邻的内存区域。

这类被称为越界(OOB)写入的漏洞特别危险,因为它可能导致内存损坏、应用程序崩溃,或根据被覆盖的内存内容潜在地执行任意代码。

此漏洞仅影响Windows系统。Linux、macOS和其他基于Unix的平台使用不同的事件循环后端(SelectorEventLoop),完全不受影响。

运行依赖基于asyncio网络功能的Python应用程序的Windows用户,特别是那些在sock_recvfrom_into()中使用nbytes参数的用户,面临风险。

该漏洞尤其与以下场景相关:

  • 由Windows托管的Python Web服务器和API后端
  • 使用UDP套接字操作的异步网络应用程序
  • 任何将可变长度网络数据接收至固定大小缓冲区的服务

Python安全团队将此漏洞评为高危级别。越界写入漏洞经常在内存损坏攻击中被利用,它们出现在像asyncio这样被广泛使用的标准库组件中,显著提高了生产环境中Windows部署的风险等级。

修复程序已通过GitHub拉取请求148809提交至CPython代码仓库。该补丁引入了缺失的边界检查,确保接收到的数据不能超过由nbytes参数定义的缓冲区大小。

Windows上的Python用户应:

  • 在cve.org/CVERecord?id=CVE-2026-3298监控官方CVE记录以获取修补版本详情
  • 在更新版Python发布后立即应用
  • 在修补之前,暂时避免在不受信任的网络环境中使用带有nbytes参数的sock_recvfrom_into()

自Python 3.8起,asyncio.ProactorEventLoop已成为Windows上的默认事件循环,这使得该漏洞在广泛的现代Python部署中都具有相关性。

建议在Windows上构建面向网络应用程序的开发人员优先应用此补丁。

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  1. CONNECT:[ UseTime:0.001179s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001668s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000709s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000704s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001318s ]
  6. SELECT * FROM `set` [ RunTime:0.000604s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001493s ]
  8. SELECT * FROM `article` WHERE `id` = 489734 LIMIT 1 [ RunTime:0.006230s ]
  9. UPDATE `article` SET `lasttime` = 1783038488 WHERE `id` = 489734 [ RunTime:0.021022s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000835s ]
  11. SELECT * FROM `article` WHERE `id` < 489734 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001299s ]
  12. SELECT * FROM `article` WHERE `id` > 489734 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001010s ]
  13. SELECT * FROM `article` WHERE `id` < 489734 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002003s ]
  14. SELECT * FROM `article` WHERE `id` < 489734 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001612s ]
  15. SELECT * FROM `article` WHERE `id` < 489734 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010308s ]
0.141341s