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Atlassian Confluence Jira 5.9.12 - Persistent Cross-Site Scripting Vulnerability
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=====[ Tempest Security Intelligence - ADV-3/2016 CVE-2016-6283 ]============== Persisted Cross-Site Scripting (XSS) in Confluence Jira Software ---------------------------------------------------------------- Author(s): - Jodson Santos - [email protected] Tempest Security Intelligence - Recife, Pernambuco - Brazil =====[Table of Contents]===================================================== 1. Overview 2. Detailed description 3. Affected versions & Solutions 4. Timeline of disclosure 5. Thanks & Acknowledgements 6. References =====[1. Overview]============================================================ * System affected : Atlassian Confluence * Software Version : 5.9.12 Other versions or models may also be affected. * Impact : This vulnerability allows an attacker to use Confluence's platform to deliver attacks against other users. =====[2. Detailed description]================================================ Atlassian Confluence version 5.9.12 is vulnerable to persistent cross-site scripting (XSS) because it fails to securely validate user controlled data, thus making it possible for an attacker to supply crafted input in order to harm users. The bug occurs at pages carrying attached files, even though the attached file name parameter is correctly sanitized upon submission, it is possible for an attacker to later edit the attached file name property and supply crafted data (i.e HTML tags and script code) without the occurrence of any security checks, resulting in an exploitable persistent XSS. In order to reproduce the vulnerability, go to a page with an attached file, click on "Attachments" in order to list the page's attachments, and then click on "Properties" for the file of your choice. Edit the file name to, for example, <script>alert(1)</script>test.pdf and then save the changes. Albeit the XSS is not executed within the page display, it is possible to trigger the execution of the supplied code while performing a search within Confluence in which results include the attachment with crafted file name. For that matter, the search terms " or * will promptly display the file and execute the injected javascript code. As a means to further enlighten this, the following excerpt demonstrates a POST request with the malicious insertion within the newFileName field: POST /pages/doeditattachment.action?pageId={pageId}&attachmentBean.fileName={filename} HTTP/1.1 Host: {confluence host} Cookie: mywork.tab.tasks=false; JSESSIONID={redacted}; confluence.browse.space.cookie=space-templates Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: {redacted} atl_token={atl_token}&pageId={pageId}&isFromPageView=false&newFileName=<script>alert(1)</script>file&newComment=&newContentType=application%2Foctet-stream&newParentPage=&confirm=Save It is worth noting that the issue may affect users regardless of privilege levels, since the malicious page/attachment can be browsed by any user within the Atlassian Confluence instance. =====[3. Affected versions & Solutions]======================================= This test was performed against Atlassian Confluence version 5.9.12. According to vendor's response, the vulnerability is addressed and the fix is part of the 5.10.6 release. =====[4. Timeline of disclosure]============================================== Jul/07/2016 - Vendor acknowledged the vulnerability. Aug/04/2016 - Vendor released the fix for the vulnerability in version 5.10.6. =====[5. Thanks & Acknowledgements]=========================================== - Tempest Security Intelligence / Tempest's Pentest Team [1] - Joaquim Brasil - Heyder Andrade - Breno Cunha =====[6. References]========================================================== [1] https://en.wikipedia.org/wiki/Confluence_(software) # 0day.today [2024-07-02] #