#VU50808 Permissions, Privileges, and Access Controls in ConnectPort X2e - CVE-2020-12878

Vulnerability identifier: #VU50808

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12878

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ConnectPort X2e
Hardware solutions / Firmware

Vendor: Digi International Inc.

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions. A remote authenticated attacker can escalate privileges from the python user to root via a symlink attack that uses chown, related to /etc/init.d/S50dropbear.sh and the /WEB/python/.ssh directory.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ConnectPort X2e: before 3.2.30.6

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External links
https://github.com/fireeye/Vulnerability-Disclosures
https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2020-0020/FEYE-2020-0020.md
https://www.digi.com/support/productdetail?pid=5570
https://www.fireeye.com/blog/threat-research/2021/02/solarcity-exploitation-of-x2e-iot-device-part-one.html
https://www.fireeye.com/blog/threat-research/2021/02/solarcity-exploitation-of-x2e-iot-device-part-two.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.