Unknown vulnerability in the passwd_check function in Shadow 4.0.4.1, and possibly other versions before 4.0.5, allows local users to conduct unauthorized activities when an error from a pam_chauthtok function call is not properly handled.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17902
http://www.debian.org/security/2004/dsa-585
http://secunia.com/advisories/13028
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000894