CVE-2019-14326

An issue was discovered in AndyOS Andy versions up to 46.11.113. By default, it starts telnet and ssh (ports 22 and 23) with root privileges in the emulated Android system. This can be exploited by remote attackers to gain full access to the device, or by malicious apps installed inside the emulator to perform privilege escalation from a normal user to root (unlike with standard methods of getting root privileges on Android - e.g., the SuperSu program - the user is not asked for consent). There is no authentication performed - access to a root shell is given upon a successful connection. NOTE: although this was originally published with a slightly different CVE ID number, the correct ID for this Andy vulnerability has always been CVE-2019-14326.

Weakness

During installation, installed file permissions are set to allow anyone to modify those files.

Affected Software

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/1.html
• https://cwe.mitre.org/data/definitions/127.html
• https://cwe.mitre.org/data/definitions/81.html

References

• https://github.com/seqred-s-a/cve-2019-14326
• https://seqred.pl/en/cve-privilege-escalation-in-andy/