Vulnerability in Ncp-E Ncp Secure Entry Client
CVE-2017-17023
The Sophos UTM VPN endpoint interacts with client software provided by NPC Engineering (www.ncp-e.com). The affected client software, "Sophos IPSec Client" 11.04 is a rebranded version of NCP "Secure Entry Client" 10.11 r32792. A vulnerability in the software update feature of the VPN client allows a man-in-the-middle (MITM) or man-on-the-side (MOTS) attacker to execute arbitrary, malicious software on a target user's computer. This is related to SIC_V11.04-64.exe (Sophos), NCP_EntryCl_Windows_x86_1004_31799.exe (NCP), and ncpmon.exe (both Sophos and NCP). The vulnerability exists because: (1) the VPN client requests update metadata over an insecure HTTP connection; and (2) the client software does not check if the software update is signed before running it.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Ncp-E Ncp Secure Entry Client — versions 10.11
- Sophos Ipsec Client — versions 11.04
Weakness classification (CWE)
References
- www.ncp-e.com/en/resources/download-vpn-client/ (Vendor Advisory)
- www.ncp-e.com/fileadmin/pdf/service_support/release_notes/NCP_Secure_Clients/NC… (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-17023?
- CVE-2017-17023 is a high-severity vulnerability in Ncp-E Ncp Secure Entry Client, classified under Insufficient Verification of Data Authenticity. CVSS score: 8.1/10. Published 2019-04-09.
- How severe is CVE-2017-17023?
- High severity. CVSS v3 base score is 8.1 out of 10.