SevDesk v1.1 iOS - Persistent Dashboard Vulnerability
Official app for mobile use of sevDesk. A product of SEVENIT GmbH.
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The Vulnerability Laboratory Research Team discovered multiple vulnerabilities in the official SEVENIT GmbH SevDesk mobile application (api).
2014-09-01: Researcher Notification & Coordination (Benjamin Kunz Mejri) 2014-09-02: Vendor Notification (SevDesk Developer Team) 2015-04-23: Public Disclosure (Vulnerability Laboratory)
SevenIT Product: SevDesk - iOS Mobile Web Application (API) 1.1
A persistent input validation web vulnerability has been discovered in the official SEVENIT Software GmbH sevDesk v1.1 iOS mobile web-application (api). The vulnerability allows remote attackers or low privileged user account to inject own malicious script codes to the application-side of the vulnerable web-application module or service.
The security vulnerability is located in the `firstname` values of the main sevDesk `Dasboard` application module & api. Remote attackers are able to inject own script codes to the mobile dashboard through the api by manipulation of the registration information in the client.
The execution of the script code occurs after the inject on the application-side in the main mobile dashboard status list. If the test user account apply for any changes in the account profile the activity becomes visible. In the context were the information and details becomes visible is the location were the execution of the persistent injected script code takes place. The attack vector is persistent and the request method to inject the code is POST.
The security risk of the persistent script code inject web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 4.2. Exploitation of the persistent input validation web vulnerability requires a low privileged sevdesk user account with restricted access and low user interaction. Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent external redirects to malicious source and persistent manipulation of affected or connected application modules (api).
Request Method(s): [+] POST
Vulnerable Application(s): [+] sevDesk v1.1 iOS
Vulnerable Module(s): [+] Registration to SevDesk
Vulnerable Parameter(s): [+] firstname (display name)
Affected Module(s): [+] Dasboard Index Status List
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged application user account and low user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.
Picture(s): ../1.png ../2.png ../3.png
The issue can be patched by a secure parse and encode of the user credentials on registration through the mobile application api. Restrict the user input to register and parse also the status listing in the main dasboard which becomes visible after the malicious changes.
The security risk of the persistent mobile web vulnerability in the api is estimated as medium. (CVSS 4.2)
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (firstname.lastname@example.org) [www.vulnerability-lab.com]
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