Published:2015/04/10  Last Updated:2015/04/10

Seasar S2Struts vulnerable to input validation bypass


Seasar S2Struts provided by The Seasar Foundation is a software framework for developing Java web applications. Seasar S2Struts is vulnerable to an issue contained in the Apache Struts 1 Validator, because S2Struts 1.2.x uses Apache Struts 1.2.x, and S2Struts 1.3.x uses Apache Struts 1.3.x.

Products Affected

  • S2Struts 1.2.13 and earlier
  • S2Struts 1.3.2 and earlier


The Validator in Apache Struts 1.1 and later contains a function (MPV -- Multi Page Validator) to efficiently define rules for input validation across multiple pages during screen transitions.
The MPV contains a vulnerability where input validation may be bypassed.
When the Apache Struts 1 Validator is used, the web application may be vulnerable even when the MPV is not used explicitly.


Input validation being bypassed may result in invalid data being entered into the database. Affects of the vulnerability depend on the application.


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

Vendor Status

Vendor Link
Seasar Foundation The Seasar Project
Seasar - S2Struts


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2015.04.10 (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) The access conditions are somewhat specialized.
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:4.3


Seasar Foundation reported this vulnerability to JPCERT/CC to notify users of its solution through JVN.
JPCERT/CC and Seasar Foundation coordinated under the Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2015-0899
JVN iPedia JVNDB-2015-000052