It was discovered that a race condition in beep (if configured as setuid via debconf) allows local privilege escalation.

For the oldstable distribution (jessie), this problem has been fixed in version 1.3-3+deb8u1.

For the stable distribution (stretch), this problem has been fixed in version 1.3-4+deb9u1.

We recommend that you upgrade your beep packages.

For the detailed security status of beep please refer to its security tracker page at: https://security-tracker.debian.org/tracker/beep