Published:2015/09/03  Last Updated:2015/09/03

BBS X102 vulnerable to cross-site scripting


BBS X102 contains a cross-site scripting vulnerability.

Vendor Information


Product name and version: BBS X102 Ver1.03


BBS X102 provided by is a bulletin board software. BBS X102 contains a cross-site scripting vulnerability.


An arbitrary script may be executed on the user's web browser.


Consider stop using BBS X102 Ver1.03
Since the developer was unreachable, existence of any mitigations are unknown.

Vendor Opinion

None provided

JPCERT/CC Addendum

During the meeting of Committee for authorizing the disclosure of unresolved vulnerabilities held on May 26, 2015, it was judged that an advisory for this vulnerability  shall be disclosed since all the criteria and conditions described below which are stated in Standards for Handling Software Vulnerability Information and Others (Directive #110, 2014) and Information Security Early Warning Partnership Guideline have been satisfied.

  1. The developer of the product is unreachable
    JPCERT/CC had tried to reach the developer for a period of time (more than 9 months) however there were no responses from the developer.  Therefore the committee reached the conclusion that it is reasonable and appropriate to judge the developer is unreachable.

    - No response to 5 separate emails (sent from April 12, 2011 to November 6, 2011)
    - No response to disclosure of the developer’s name (listed on September 29, 2011) and product name and its version (listed on December 16, 2011) in “List of unreachable developers” page on JVN.
    - No response to Announcement of screening procedure for vulnerability disclosure (sent on April 28, 2015)
  2. Existence of vulnerability has been verified
    It was verified that the product contains a cross-site scripting vulnerability by IPA.  Arbitrary script execution on the user’s web browser was confirmed which violates the “Integrity” of the product.  For verification details, refer to the “Verification” section.
  3. Not disclosing this case may result in the risk that product users will have no means to know of the existence of the vulnerability in the product
    In addition, according to the Terms of Use available on the developer’s website, users are permitted to copy, revise, or distribute the product. Therefore, the developer cannot directly contact all users of this product to notify of the cross-site scripting vulnerability.  It was determined that disclosure of this vulnerability is legitimate under these conditions.
  4. There are no particular reasons that would make disclosure inappropriate
    After considering the developer’s stance and the risk to product users, the committee has judged that there are no particular reasons that would make disclosure inappropriate or that disclosure may cause any other issues.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2015.09.03 (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


Validation Information
The vulnerability was reported to IPA and its existence was confirmed by IPA.

Date of validation
・ April 16, 2015

Validation environment(Server)
・ Debian 7.8
・ Apache 2.2.22 perl 5.14.2
・ BBS X102 1.03

Validation environment(Client)
・ Microsoft Windows 7 Professional SP1
・ Microsoft Internet Explorer 11.0.9600.16428 XSS filter is enabled
・ Gooogle Chrome 41.0.2272.118m               XSS filter is enabled
・ Mozilla Firefox 36.0.1
・ Opera 28.0.1750.48

Validation result
・The reproducibility confirmed under the environment specified below
  Microsoft Internet Explorer 11.0.9600.16428 XSS filter is enabled
  Google Chrome 41.0.2272.118m                XSS filter is enabled
  Mozilla Firefox 36.0.1
  Opera 28.0.1750.48

Other Information

JPCERT Alert  
JPCERT Reports  
CERT Advisory  
CPNI Advisory  
CVE CVE-2015-2985
JVN iPedia JVNDB-2015-000301