In shadow before 4.5, the newusers tool could be made to manipulate
internal data structures in ways unintended by the authors. Malformed input
may lead to crashes (with a buffer overflow or other memory corruption) or
other unspecified behaviors. This crosses a privilege boundary in, for
example, certain web-hosting environments in which a Control Panel allows
an unprivileged user account to create subaccounts.
More Information

Updated: 2019-01-14 21:23:23 UTC (commit 51f9b73af244ba86b9321e46e526586c25a8e060)