Security Advisory - Curesec Research Team 1. Introduction Affected Product: MoinMoin 1.9.8 Fixed in: 1.9.9 Fixed Version Link: http://static.moinmo.in/files/moin-1.9.9.tar.gz Vendor Website: https://moinmo.in Vulnerability Type: XSS Remote Exploitable: Yes Reported to vendor: 09/05/2016 Disclosed to public: 11/10/2016 Release mode: Coordinated Release CVE: CVE-2016-7148, CVE-2016-7146 Credits Tim Coen of Curesec GmbH 2. Overview MoinMoin is an open source Wiki application written in python. In version 1.9.8, it is vulnerable to two persistent XSS issues. This allows an attacker to steal cookies, inject JavaScript keyloggers, or bypass CSRF protection. 3. Details XSS 1: Persistent XSS (CVE-2016-7148) CVSS: Medium 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N Description: A page name is echoed in the attach file page without encoding, leading to persistent XSS. Proof of Concept: To place the payload create a new page which contains the payload as name by visiting: http://localhost:9090/ newtest%27%22%3E%3Cimg%20src%3Dno%20onerror%3Dalert%287%29%3E?action=edit To trigger the payload visit the attach file page: http://localhost:9090/ newtest%27%22%3E%3Cimg%20src%3Dno%20onerror%3Dalert%287%29%3E?action=AttachFile Note that there must be at least one existing attachment. XSS 2: Persistent XSS (CVE-2016-7146) CVSS: Medium 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N Description: The GUI editor is vulnerable to XSS via a specifically crafted URL, as it echoes part of the URL without encoding in two different places. The issue can be exploited reflected or persistent. Proof of Concept: Reflected example (the page does not have to exist): http://localhost:9090/'"> <img src=no onerror=alert(1)>?action=fckdialog&dialog=attachment Alternatively, an attacker can create a page containing the payload: http://localhost:9090/ newtestfoo'%22%3E%3Cimg%20src=no%20onerror=alert(1)%3E The payload is triggered when attaching a file via the the GUI editor ("Edit (GUI)" -> "Attachment"). 4. Solution To mitigate this issue please upgrade at least to version 1.9.9: http://static.moinmo.in/files/moin-1.9.9.tar.gz Please note that a newer version might already be available. 5. Report Timeline 09/05/2016 Contacted Vendor, Vendor confirmed, Requested CVEs 09/06/2016 CVEs assigned and distributed to vendor 10/05/2016 Vendor requests more time 10/31/2016 Vendor releases fix 11/10/2016 Disclosed to public Blog Reference: https://www.curesec.com/blog/article/blog/MoinMoin-198-XSS-175.html -- blog: https://www.curesec.com/blog tweet: https://twitter.com/curesec Curesec GmbH Curesec Research Team Josef-Orlopp-StraAe 54 10365 Berlin, Germany