漏洞信息
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Vulnerability Title
pam_usb: xfree() does not call explicit_bzero — sensitive cryptographic material may linger in freed heap
Vulnerability Description
pam_usb provides hardware authentication for Linux using ordinary removable media. In versions 0.9.1 and below, the xfree() memory release helper in calls free() without first zeroing the buffer contents, releasing heap-allocated buffers containing sensitive data — including one-time pad bytes read from disk — without clearing, leaving the sensitive content in freed heap memory until it happens to be overwritten by a subsequent allocation. On a system where a use-after-free condition exists, or where a heap inspection primitive becomes available, this could allow recovery of pad values or other authentication material from freed memory regions. This is a defence-in-depth requirement consistent with prior hardening work in this codebase (GHSA-vx6f-rrqr-j87c applied explicit_bzero to some pad paths; this issue generalises the pattern to the central deallocation helper).
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Vulnerability Type
编译器移除释放缓冲区的代码
Vulnerability Title
mcdope pam_usb 资源管理错误漏洞
Vulnerability Description
mcdope pam_usb是mcdope的认证模块。 mcdope pam_usb 0.9.1及之前版本存在资源管理错误漏洞,该漏洞源于xfree()内存释放函数未在调用free()前清除缓冲区内容,导致释放的堆内存中残留敏感数据(包括一次性填充字节),可能通过释放后重用或堆检查原语恢复填充值或其他认证材料。
CVSS Information
N/A
Vulnerability Type
N/A