Domain Technologie Control (DTC) before 0.34.1 includes a password in the -b command line argument to htpasswd, which might allow local users to read the password by listing the process and its arguments.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637537
http://www.openwall.com/lists/oss-security/2011/08/24/10
http://www.openwall.com/lists/oss-security/2011/08/13/1