CVE-2017-13089— GNU Wget 缓冲区错误漏洞

GNU Wget: stack overflow in HTTP protocol handling

The http.c:skip_short_body() function is called in some circumstances, such as when processing redirects. 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 skip the chunk in pieces of 512 bytes by using the MIN() macro, but ends up passing the negative chunk length to connect.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.

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栈缓冲区溢出

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栈的缓冲区溢出漏洞。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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