漏洞信息
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Vulnerability Title
pam_usb: NULL Dereference Crash in pusb_is_loginctl_local when loginctl Returns Empty Remote Field
Vulnerability Description
pam_usb provides hardware authentication for Linux using ordinary removable media. In versions 0.9.1 and below, pusb_is_loginctl_local() can cause a NULL dereference crash when parsing loginctl output. The function calls popen() and reads the result; if the Remote field is only a newline, fgets() succeeds but strtok_r(buf, "\n", &saveptr) returns NULL. A subsequent strcmp(is_remote, "no") then dereferences NULL, causing undefined behavior (typically SIGSEGV) and crashing the PAM module. This can crash the authenticating process (e.g., sudo, login) and, depending on PAM stack configuration, deny access for all users of the affected service. This issue has been fixed in version 0.9.2.
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
空指针解引用
Vulnerability Title
McDope pam_usb 异常处理不当漏洞
Vulnerability Description
mcdope pam_usb是mcdope的认证模块。 McDope pam_usb 0.9.1版本及之前版本存在异常处理不当漏洞,该漏洞源于pusb_is_loginctl_local函数解析loginctl输出时空指针取消引用,可能导致认证进程崩溃,并拒绝服务影响所有用户。
CVSS Information
N/A
Vulnerability Type
N/A