Published:2015/07/10  Last Updated:2015/07/10

Simple Oekaki BBS vulnerability where arbitary files may be deleted


Simple Oekaki BBS provided by LEMON-S PHP contains a vulnerability that may allow a remote attacker to delete arbitrary files.

Products Affected

  • Simple Oekaki BBS versions prior to v1.21


Simple Oekaki BBS provided by LEMON-S PHP contains a flaw in parsing the oekakis parameter in index.php, which may allow a remote attacker to delete arbitrary files.


A remote attacker may delete arbitrary files on the server.


Update the Software
Update to the latest version according to the information provided by the developer.

Vendor Status

Vendor Status Last Update Vendor Notes
LEMON-S PHP Vulnerable 2015/07/10


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2015.07.10 (CVSS Base Metrics)

What is CVSS?

Measures Severity Description
Access Vector(AV) Local (L) Adjacent Network (A) Network (N) A vulnerability exploitable with network access means the vulnerable software is bound to the network stack and the attacker does not require local network access or local access. Such a vulnerability is often termed "remotely exploitable".
Access Complexity(AC) High (H) Medium (M) Low (L) Specialized access conditions or extenuating circumstances do not exist.
Authentication(Au) Multiple (M) Single (S) None (N) Authentication is not required to exploit the vulnerability.
Confidentiality Impact(C) None (N) Partial (P) Complete (C) There is no impact to the confidentiality of the system.
Integrity Impact(I) None (N) Partial (P) Complete (C) Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.
Availability Impact(A) None (N) Partial (P) Complete (C) There is reduced performance or interruptions in resource availability.

Base Score:6.4


Shoji Baba reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2015-2970
JVN iPedia JVNDB-2015-000097