Description
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/log.c contains a process-wide static pointer that is written on every PAM invocation with the address of a stack-local variable. This violates the PAM re-entrancy requirement and creates a data race when the PAM stack is invoked concurrently from multiple threads. This vulnerability is fixed in 0.9.1.
Problem types
CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-476: NULL Pointer Dereference
Product status
References
github.com/...am_usb/security/advisories/GHSA-qg76-57wq-mpv6
github.com/mcdope/pam_usb/issues/350
github.com/mcdope/pam_usb/issues/55