Published:2015/07/29  Last Updated:2015/07/29

yoyaku_v41 vulnerable to authentication bypass


yoyaku_v41 provided by Webservice-DIC contains an authentication bypass vulnerability.

Products Affected

  • yoyaku_v41


yoyaku_v41 provided by Webservice-DIC is a software to manage conference room reservations. yoyaku_v41 contains an authentication bypass vulnerability (CWE-592).


A remote attacker could bypass yoyaku_v41's authentication, and make an unintentional reservation.


Do not use yoyaku_v41
yoyaku_v41 is no longer being developed or maintained. It is recommended to stop using yoyaku_v41.

Vendor Status

Vendor Status Last Update Vendor Notes
Webservice-DIC Vulnerable 2015/07/29


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2015.07.29 (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 no impact to the availability of the system.

Base Score:5.0


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-2015-2978
JVN iPedia JVNDB-2015-000108