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curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.

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释放后使用

Haxx curl 资源管理错误漏洞

HAXX Haxx curl是瑞典Haxx（HAXX）公司的一套利用URL语法在命令行下工作的文件传输工具。该工具支持文件上传和下载，并包含一个用于程序开发的libcurl（客户端URL传输库）。 Haxx curl 存在资源管理错误漏洞，该漏洞使用OpenSSL库作为TLS后端的curl版本可以在OpenSSL库执行TLS会话重新协商后使用已释放的内存。恶意的TLS服务器可能会利用这个缺陷来崩溃，或者使用curl库以客户端应用程序的特权执行任意代码。

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