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

<img width="215" alt="fig1" src="https://github.com/user-attachments/assets/43e02a50-bdd9-48d9-9194-73946fcc56d9" />

Figure 1. Registration

• Go to static analysis of any application

<img width="1207" alt="fig2" src="https://github.com/user-attachments/assets/9ed141a7-a667-4a96-81fd-d81127874104" />

Figure 2. Static analysis

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

<img width="1400" alt="fig3" src="https://github.com/user-attachments/assets/bf8b704b-9067-4861-a7d3-05ec119d9a3f" />

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

<img width="1412" alt="fig5" src="https://github.com/user-attachments/assets/dc8f639f-36b0-47d3-807d-58ae551fcbfc" />

Figure 5. Token usage

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

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