漏洞信息
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Vulnerability Title
pam_usb: Missing O_EXCL on pad temp file creation allows concurrent update race
Vulnerability Description
pam_usb provides hardware authentication for Linux using ordinary removable media. In versions prior to 0.9.2, when updating a one-time pad file, a temporary file is created using open() without the O_EXCL flag. Without O_EXCL, the create operation is not atomic: two concurrent processes racing to update the same pad may both succeed in opening the file, with the second write silently overwriting the first. The one-time pad is the core replay-prevention mechanism of pam_usb. A successful race could result in the stored pad value diverging from what either process expected, potentially causing authentication failures or, in a precisely timed attack, creating a window for pad reuse. This issue has been fixed in version 0.9.2.
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Vulnerability Title
McDope pam_usb 竞争条件问题漏洞
Vulnerability Description
mcdope pam_usb是mcdope的认证模块。 McDope pam_usb 0.9.2之前版本存在竞争条件问题漏洞,该漏洞源于更新一次性密码本文件时使用open()函数未设置O_EXCL标志,导致竞争条件,可能造成身份验证失败或密码本重用。
CVSS Information
N/A
Vulnerability Type
N/A