MobSF Local Privilege Escalation

Product: Mobile Security Framework (MobSF) Version: 4.3.0 CWE-ID: CWE-269: Improper Privilege Management CVSS vector v.4.0: 7.1 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N) CVSS vector v.3.1: 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) Description: MobSF has a functionality of dividing users by roles. This functionality is not efficient, because any registered user can get API Token with all privileges. Impact: Information Disclosure Vulnerable component: Code output component (/source_code) Exploitation conditions: authorized user Mitigation: Remove token output in the returned js-script Researcher: Egor Filatov (Positive Technologies)

Research

Researcher discovered zero-day vulnerability «Local Privilege Escalation» in Mobile Security Framework (MobSF). To reproduce the vulnerability follow the steps below.

• A user with minimal privileges is required, so the administrator must create a user account

Figure 1. Registration

• Go to static analysis of any application

Figure 2. Static analysis

• Go to the code review of the selected application and get a token with all privileges in the response

Figure 3. Token receiving

• This token can be used to retrieve dynamic analysis information that has not been accessed before.

Figure 4. No access demonstration

Figure 5. Token usage

As a result, the user is able to escalate the privileges.

Please, assign all credits to: Egor Filatov (Positive Technologies)