Apache Portable Runtime Utility (APR-util) 1.6.0 and prior fail to validate the integrity of SDBM database files used by apr_sdbm*() functions, resulting in a possible out of bound read access. A local user with write access to the database can make a program or process using these functions crash, and cause a denial of service.
https://lists.debian.org/debian-lts-announce/2017/11/msg00006.html
http://www.securitytracker.com/id/1042004