Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ncp-E | Ncp Secure Entry Client | 10.11 |
| Sophos | Ipsec Client | 11.04 |
Related Weaknesses (CWE)
References
- https://www.ncp-e.com/en/resources/download-vpn-client/#c8680Vendor Advisory
- https://www.ncp-e.com/fileadmin/pdf/service_support/release_notes/NCP_Secure_CliVendor Advisory
- https://www.ncp-e.com/en/resources/download-vpn-client/#c8680Vendor Advisory
- https://www.ncp-e.com/fileadmin/pdf/service_support/release_notes/NCP_Secure_CliVendor Advisory
FAQ
What is CVE-2017-17023?
CVE-2017-17023 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 ...
How severe is CVE-2017-17023?
CVE-2017-17023 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-17023?
Check the references section above for vendor advisories and patch information. Affected products include: Ncp-E Ncp Secure Entry Client, Sophos Ipsec Client.