Vulnerability in Phicomm K2
CVE-2022-25217
Use of a hard-coded cryptographic key pair by the telnetd_startup service allows an attacker on the local area network to obtain a root shell on the device over telnet. The builds of telnetd_startup included in the version 22.5.9.163 of the K2 firmware, and version 32.1.15.93 of the K3C firmware (possibly amongst many other releases) included both the private and public RSA keys. The remaining versions cited here redacted the private key, but left the public key unchanged. An attacker in possession of the leaked private key may, through a scripted exchange of UDP packets, instruct telnetd_startup to spawn an unauthenticated telnet shell as root, by means of which they can then obtain complete control of the device. A consequence of the limited availablility of firmware images for testing is that models and versions not listed here may share this vulnerability.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Phicomm K2
- Phicomm K2 Firmware
- Phicomm K3c
- Phicomm K3c Firmware
- Phicomm Routers — versions K2 22.5.9.163, K3 21.5.37.246, K3C 32.1.15.93 -- 32.1.26.175, K3C 33.1.25.177, K2P 20.4.1.7, K2 A7 22.6.506.28
Weakness classification (CWE)
References
- www.tenable.com/security/research/tra-2022-01 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-25217?
- CVE-2022-25217 is a high-severity vulnerability in Phicomm K2, classified under Use of Hard-coded Credentials. CVSS score: 7.8/10. Published 2022-03-10.
- How severe is CVE-2022-25217?
- High severity. CVSS v3 base score is 7.8 out of 10.