Technical Advisory – Authorization Bypass Allows for Pinboard Corruption
Virtual Security Research, LLC. http://www.vsecurity.com/ Security Advisory -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Advisory Name: ThoughtSpot - Authorization Bypass Allows for Pinboard Corruption Release Date: 2019-06-10 Application: ThoughtSpot Versions: 5.x before 5.1.2 4.4.1.x onwards Severity: Medium Author: Will Enright
Vendor Status: Update Released  CVE Candidate: CVE-2019-12782 Reference: https://www.vsecurity.com/resources/advisory/201912782-1.txt =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Product Description ~-----------------~ From ThoughtSpot's website : "ThoughtSpot is a search & AI-driven analytics platform for the enterprise. Anyone can use search to analyze company data in seconds and get automated insights when you need them." Vulnerability Overview ~--------------------~ In February 2019, VSR identified an authorization bypass vulnerability in ThoughtSpot which allows any low-privilege user with write access to at least one pinboard to corrupt arbitrary unauthorized pinboards belonging to any other user. The vulnerability originates from a failure to verify user-supplied GUIDs to ensure the requesting user is properly authorized to modify the associated pinboard. This exploit requires a valid low-privilege user session to submit the vulnerable request. Vulnerability Details ~-------------------~ The ThoughtSpot application allows users to generate, visualize, and organize analytics reports on company data. One method for viewing data is to organize reports on pinboards to be shared with specific authorized users or groups. However, the application fails to enforce authorization on pinboard update requests, allowing a user to modify the ID of pinboards belonging to other users without authorization. It does not appear possible for an attacker to gain access to or modify a pinboard's contents in place. However, it is possible for a low-privilege user to corrupt the original pinboard by spoofing GUIDs in normal pinboard update requests. This prevents the original owner from accessing the board and removes it from their view. An attacker could effectively corrupt / remove all pinboards from the application deployment, regardless of owner. An attacker would need access to a valid low-privilege user session with write access to at least one pinboard in order to submit the vulnerable request and target user pinboards. Therefore, administrators could review application logs to identify malicious users. An attacker would also need to know the GUID associated with any targeted pinboards. These GUIDs are revealed within API responses during normal application use. Starting in version 5.1, the application includes an optional setting which prevents GUIDs from being leaked in responses to unauthorized requests. Versions Affected ~---------------~ The issue was originally discovered in version 18.104.22.168, but exists starting in version 4.4.1. The issue was fixed with the release of version 5.1.2. Vendor Response ~-------------~ The following timeline details ThoughtSpot's response to the reported issue: 2019-02-28 ThoughtSpot contacted and initial vulnerability details provided. Internal triage started. 2019-03-05 ThoughtSpot confirmed vulnerability details and outlined remediation timeline. 2019-05-01 ThoughtSpot confirmed release of version 5.1.2 , fixing the vulnerability. 2019-05-13 VSR provided ThoughtSpot with security advisory draft. 2019-06-10 VSR advisory released. Recommendation ~------------~ Upgrade all client installs to the latest version of the ThoughtSpot software as soon as possible. Common Vulnerabilities and Exposures (CVE) Information ~----------------------------------------------------~ The Common Vulnerabilities and Exposures (CVE) project has assigned the number CVE-2019-12782 to this issue. This is a candidates for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. Acknowledgments ~--------------~ Thanks to the ThoughtSpot team for a prompt response, confirmation, and patch. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= References: 1. https://www.thoughtspot.com/ 2. https://docs.thoughtspot.com/5.1/release/notes.html =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= This advisory is distributed for educational purposes only with the sincere hope that it will help promote public safety. This advisory comes with absolutely NO WARRANTY; not even the implied warranty of merchantability or fitness for a particular purpose. Neither Virtual Security Research, LLC nor the author accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. See the VSR disclosure policy for more information on our responsible disclosure practices: http://www.vsecurity.com/company/disclosure =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Copyright 2019 Virtual Security Research, LLC. All rights reserved.
Editor's note: This work was originally published by VSR on their website at https://www.vsecurity.com/resources/advisories.html. VSR is now a part of NCC Group, so we have migrated this content to research.nccgroup.com. The advisory text as above has been copy-pasted to this blog for historical reference.