CVE-2017-12424

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.

Bugs

• <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=756630&gt;
• <https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1266675&gt;