CVE-2026-48981— McDope pam_usb 输入验证错误漏洞

pam_usb: xmlReadFile flags=0 permits XXE network entity fetching in conf.c

pam_usb provides hardware authentication for Linux using ordinary removable media. In versions prior to 0.9.2, pam_usb calls xmlReadFile() with flags=0 when loading the configuration file, allowing libxml2 to process external entity references (XXE), potentially making outbound network connections or local file reads at XML parse time from the context of the authenticating process. The vulnerability requires the configuration file to contain crafted XML entity references. Since pam_usb.conf is root-owned, direct exploitation requires prior write access to the config, but the defence-in-depth impact is significant given that pam_usb.so runs in setuid contexts (sudo, su). This issue has been fixed in version 0.9.2.

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L

XML外部实体引用的不恰当限制(XXE)

McDope pam_usb 输入验证错误漏洞

mcdope pam_usb是mcdope的认证模块。 McDope pam_usb 0.9.2之前版本存在输入验证错误漏洞，该漏洞源于加载配置文件时使用代码xmlReadFile()设置flags=0，允许libxml2处理外部实体引用（XXE），可能导致在XML解析时从认证进程的上下文发起出站网络连接或本地文件读取。

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