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pacman before 5.1.3 allows directory traversal when installing a remote package via a specified URL "pacman -U <url>" due to an unsanitized file name received from a Content-Disposition header. pacman renames the downloaded package file to match the name given in this header. However, pacman did not sanitize this name, which may contain slashes, before calling rename(). A malicious server (or a network MitM if downloading over HTTP) can send a Content-Disposition header to make pacman place the file anywhere in the filesystem, potentially leading to arbitrary root code execution. Notably, this bypasses pacman's package signature checking. This occurs in curl_download_internal in lib/libalpm/dload.c.

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pacman 路径遍历漏洞

pacman是一款使用在Linux中的软件包管理器。 pacman 5.1.3之前版本中存在安全漏洞，该漏洞源于程序没有过滤来自Content-Disposition消息报头的文件名称。攻击者可利用该漏洞执行代码。

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