######################################################### kpopper insecure temporary file creation Vendor: http://kpopper.sourceforge.net/ Advisory: http://www.zataz.net/adviso/kpopper-06152005.txt Vendor informed: yes Exploit available: yes Impact : low Exploitation : low ######################################################### The vulnerability is caused due to temporary file being created insecurely. This can be exploited via symlink attacks in combination to create and overwrite arbitrary files with the privileges of the user running the affected script. ########## Versions: ########## kpopper <= 1.0 ########## Solution: ########## To prevent symlink attack use kernel patch such as grsecurity ######### Timeline: ######### Discovered : 2005-06-13 Vendor notified : 2005-06-15 Vendor response : no reponse Vendor fix : no fix Vendor Sec report (vendor-sec@private) : 2005-06-27 Disclosure : 2005-07-04 ##################### Technical details : ##################### Vulnerable code : ----------------- popper/popper-send.sh #!/bin/sh echo "$2" > /tmp/.popper-new echo `date +"%a %l:%m %p"` >> /tmp/.popper-new cat "$1" >> /tmp/.popper-new mv -f /tmp/.popper-new /tmp/.popper The .popper is also used into : popper/popper.cpp ######### Related : ######### Bug report : http://bugs.gentoo.org/show_bug.cgi?id=94475 CVE : CAN-2005-1917 ##################### Credits : ##################### Eric Romang (eromang@private - ZATAZ Audit) Thxs to Gentoo Security Team. (Taviso, jaervosz, solar, etc.)
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