OpenSSH version 2.9 and earlier, with X forwarding enabled, allows a local attacker to delete any file named 'cookies' via a symlink attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6676
http://www.openbsd.org/errata29.html
http://www.kb.cert.org/vuls/id/655259
http://www.calderasystems.com/support/security/advisories/CSSA-2001-023.0.txt
http://online.securityfocus.com/archive/1/188737
http://download.immunix.org/ImmunixOS/7.0/updates/IMNX-2001-70-034-01
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000431
http://archives.neohapsis.com/archives/bugtraq/2001-06/0007.html