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    Zero-Day Research/CVE-2019-20439
    ▲ MediumCVSS 4.8✓ PatchedEPSS 0.00383%

    Reflected Cross-Site Scripting in WSO2

    An issue was discovered in WSO2 API Manager 2.6.0. A potential Reflected Cross-Site Scripting (XSS) vulnerability has been identified in defining a scope in the manage the API page of the API Publisher.

    CVE IDCVE-2019-20439
    CVSS v3.14.8 Medium
    VendorWSO2
    CWECWE-79
    DisclosedJul 6, 2019
    StatusFixed
    All advisories
    • 01Description
    • 02Proof of Concept
    • 03Impact
    • 04Remediation
    • 05Timeline
    • 06References
    01/Description

    What this actually is.

    Technical background, root cause, and affected surface.

    A vulnerability was discovered on WSO2 API Manager 2.6.0 in defining the scope to manage the API page of the API Publisher. An input variable vulnerable to stored XSS is ‘roles’ on the API page. A reflected cross-site script (XSS) vulnerability allows an attacker to inject malicious code into the scope to an API in the API publisher by providing XSS payload as a value for roles.

    Vendor
    WSO2
    Affected Product
    WSO2 API Manager
    CVE
    CVE-2019-20439
    Securin ID
    2019-CSW-11-1031
    Status
    Fixed
    Date
    July 6, 2019
    Severity
    Medium
    CVSS Score
    4.8
    Vector
    CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
    CWE
    CWE-79
    02/Proof of Concept

    From one request
    to root shell.

    Reproduced in a sandboxed environment. Requires only LAN or WiFi adjacency.

    4.8CVSS 3.1
    VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
    ScopeChanged
    ImpactC:L / I:L / A:N
    SeverityMedium

    The following vulnerability was tested on the WSO2 API Manager version 2.6.0 Product.

    PoC · Exploitation Steps▲ trigger
    01Issue 01: Reflected Cross-Site Scripting.02Figure 01: Start creating an API.03Figure 02: Click on the Add Scope button to add resources information.04Figure 03: Enter XSS Payload the Roles section.05Figure 04: Injected XSS payload, <img src=x onerror=prompt(1)> gets reflected in the same browser as response.
    03/Impact

    What an attacker does to you.

    Post-exploitation outcomes mapped to CVSS impact metrics.

    Through an XSS attack, the attacker can make the browser redirect to a malicious website. Unauthorized actions such as changing the UI of the web page, retrieving information from the browser are possible. But since all session-related sensitive cookies are set with httpOnly flat and protected, session hijacking or mounting a similar attack would not be possible.

    04/Remediation

    Fix it. In this order.

    A runbook, not a checklist. Sequence matters — assume compromise before you act.

    Download the relevant patch based on the product version.

    Securin advisory — For coordinated remediation support or threat-actor briefings related to CVE-2019-20439, contact disclose@securin.io
    05/Disclosure Timeline

    Vendors moved in days.
    Attackers in hours.

    Reconstructed from vendor advisories, CISA bulletins, and Securin research records.

    Jul 05, 2019

    Discovered in WSO2 API Manager v2.6.0.

    Jul 06, 2019

    Reported to the intigriti platform.

    Jul 08, 2019

    Rejected the submission in the intigriti platform

    Jul 24, 2019

    Closed the issue in the intigriti platform

    Reported to WSO2

    WS02 acknowledged the report

    Aug 13, 2019

    Fixing began in all affected versions

    Nov 04, 2019

    Public and customer announcement by the vendor about the vulnerability

    Timeline recorded · Disclosure coordinated by Securin

    06/References

    Cite, verify, go deeper.

    Primary sources — NVD, CISA KEV, and machine-readable IoC feed.

    NVD

    NVD — CVE-2019-20439

    nvd.nist.gov/vuln/detail/CVE-2019-20439 →
    SEC

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