GNU Wget: heap overflow in HTTP protocol handling

The retr.c:fd_read_body() function is called when processing OK responses. When the response is sent chunked in wget before 1.19.2, the chunk parser uses strtol() to read each chunk's length, but doesn't check that the chunk length is a non-negative number. The code then tries to read the chunk in pieces of 8192 bytes by using the MIN() macro, but ends up passing the negative chunk length to retr.c:fd_read(). As fd_read() takes an int argument, the high 32 bits of the chunk length are discarded, leaving fd_read() with a completely attacker controlled length argument. The attacker can corrupt malloc metadata after the allocated buffer.

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堆缓冲区溢出

GNU Wget 缓冲区错误漏洞

GNU Wget是GNU计划开发的一套用于在网络上进行下载的自由软件，它支持通过HTTP、HTTPS以及FTP这三个最常见的TCP/IP协议下载。 GNU Wget 1.19.2之前的版本中存在基于堆的缓冲区溢出漏洞。远程攻击者可利用该漏洞在受影响的应用程序上下文中执行任意代码或造成拒绝服务。

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