The GnuPG plugin in kopete before 0.6.2 does not properly cleanse the command line when executing gpg, which allows remote attackers to execute arbitrary commands.
http://www.mandriva.com/security/advisories?name=MDKSA-2003:055
http://kopete.kde.org/index.php?page=newsstory&news=Kopete_releases_version_0.6.2
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000665