File Descriptor Inheritance Vulnerability in Yubico pam-u2f 1.0.7

CVE-2019-12210 · MEDIUM Severity

AV:N/AC:L/AU:S/C:P/I:P/A:N

In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set using debug_file, that file descriptor is not closed when a new process is spawned. This leads to the file descriptor being inherited into the child process; the child process can then read from and write to it. This can leak sensitive information and also, if written to, be used to fill the disk or plant misinformation.

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