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SEC Consult SA-20150409-0 :: Multiple XSS & XSRF vulnerabilities in Comalatech Comala Workflows

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SEC Consult Vulnerability Lab Security Advisory < 20150409-0 > ======================================================================= title: Multiple XSS & XSRF vulnerabilities product: Comalatech Comala Workflows vulnerable version: <= 4.6.1 fixed version: 4.6.2 for Confluence 5.4+ and 4.5.4 for Confluence 4.3+ impact: High homepage: https://marketplace.atlassian.com/plugins/com.comalatech.workflow found: 2015-02-16 by: J. Krautwald (Office Berlin) M. Niederwieser (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult Berlin - Frankfurt/Main - Montreal - Singapore Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor & product description: ----------------------------- "Build your Confluence content your own way through Comala Workflows approvals, tasks, notifications and workflows. Set customized workflows to create, review, approve and publish your content. Assign page reviewers Create team tasks Publish approved content Manage your documentation stages Use Comala Workflows for: Quality Management, Standards Compliance, Technical Documentation, Editorial Publishing" Source: https://marketplace.atlassian.com/plugins/com.comalatech.workflow Business recommendation: ------------------------ Comala Workflows suffers from multiple vulnerabilities due to improper input and output validation. By exploiting these vulnerabilities an attacker could: 1. Attack other users of the web application with JavaScript code, browser exploits or Trojan horses, or 2. perform unauthorized actions in the name of another logged-in user. Vulnerability overview/description: ----------------------------------- 1. Multiple cross-site scripting issues Comala Workflows suffers from multiple reflective & stored cross-site scripting vulnerabilities, which allow an attacker to steal other user's sessions, to impersonate other users and to gain unauthorized access to documents hosted in the Confluence instance where the Workflows module is embedded. There are many parameters which are not properly sanitized and thus are vulnerable to XSS. 2. Cross-site request forgery vulnerabilities Comala Workflows does not implement the use of shared secrets (tokens) to prevent cross-site request forgery (XSRF) attacks. If an attacker is able to lure a user into clicking a crafted link or by embedding such a link within web pages (e.g. discussion forums) he could manipulate data or automatically inject XSS payloads to attack other users. Proof of concept: ----------------- 1. Multiple cross-site scripting issues a) The input parameters for giving a workflow a name, appending a label to a given workflow, or adding a new task for a given state are not properly sanitized and thus susceptible to reflected cross-site scripting. The hereby affected scripts alongside the vulnerable GET parameters are: Script GET Parameter(s) saveproperties.action newLabelName, newWorkflowName newtask.action taskName When editing an existing workflow via the Markup functionality (accessible via the workflowMarkup POST parameter of /plugins/approvalsworkflow/saveworkflowmarkup.action) the attachment-macro is also susceptible to reflected cross-site scripting. b) When editing an existing workflow via the Markup functionality (accessible via the workflowMarkup POST parameter of /plugins/approvalsworkflow/saveworkflowmarkup.action) the workflow element task does not sanitize the given input and is thus susceptible to cross-site scripting. The application does not sanitize the given input before printing it to the "Page Activity" popup which leads to the execution of the permanently injected script. When assigning such a task to a co-worker, an e-mail containing the actual payload is sent to the assigned person and when opening the "My Comala Workflow Tasks", "Page Activity", or "Page Activity Macro" page, it gets executed. 2. Cross-site request forgery vulnerabilities The /plugins/approvalsworkflow/saveworkflowmarkup.action script for editing an existing workflow via the Markup functionality, for example, is susceptible to cross-site request forgery. If an attacker knows a valid project name (key parameter) and the corresponding workflow name (workflowName parameter), she might exploit this vulnerability to set the Markup code of the workflow to an arbitrary value (e.g. a XSS payload via the task element, see 1. b)). Vulnerable / tested versions: ----------------------------- The vulnerabilities have been verified to exist in up to and including version 4.6.1. Vendor contact timeline: ------------------------ 2015-03-17: Contacted vendor through email 2015-03-18: Vendor confirmed vulnerabilities, offered workaround and said they would fix the vulnerabilities asap 2015-04-08: Vendor released updated versions and advisory 2015-04-09: Coordinated release of security advisory Solution: --------- Upgrade Comala Workflows to version 4.6.2 for Confluence 5.4+ or upgrade Comala Workflows to version 4.5.4 for Confluence 4.3+ See the following advisory by the vendor for further information: https://wiki.comalatech.com/display/CW/Comala+Workflows+Security+Advisory+2015-04-08 Workaround: ----------- Disable the legacy attachment and embed macros feature. Disable page workflows. Edit workflows to prevent tasks being created (taskable param on states). Disable workflow tasks. Advisory URL: ------------- https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Berlin - Frankfurt/Main - Montreal - Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF J. Krautwald / @2015