Published:2007/06/25  Last Updated:2008/05/21

Hiki arbitrary file deletion vulnerability


Hiki, a Wiki clone software developed by Hiki Development Team, contains a vulnerability that may allow a remote attacker to delete arbitrary files.

Products Affected

  • Hiki 0.8.0 - 0.8.6


Hiki contains a vulnerability that allows an arbitrary file to be deleted on a server running Hiki. This is caused by the improper handling of a session management file.


A remote attacker may be able to delete arbitrary files with the privilege of the user running Hiki.


Upgrade the software
The developer has released Hiki 0.8.7 which contains the fix for this vulnerability. We recommend that affected users upgrade their software to the fixed version.


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2007.06.25

Measures Conditions Severity
Access Required Routed - can be attacked over the Internet using packets
  • High
Authentication None - anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required None - the vulnerability can be exploited without an honest user taking any action
  • High
Exploit Complexity Low-Medium - some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Medium-High

Description of each analysis measures


Kazuhiro Nishiyama reported this vulnerability to IPA.
JPCERT/CC coordinated with the vendors under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
JVN iPedia JVNDB-2007-000476

Update History