Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 23.4%
CVSS Severity
CVSS v3 Score 8.1
CVSS v2 Score 9.3
References
- https://www.ncp-e.com/en/resources/download-vpn-client/#c8680
- https://www.ncp-e.com/fileadmin/pdf/service_support/release_notes/NCP_Secure_Clients/NCP_Secure_Entry_Client/NCP_RN_Win_Secure_Entry_Client_11_14_r42039_en.pdf
- https://www.ncp-e.com/en/resources/download-vpn-client/#c8680
- https://www.ncp-e.com/fileadmin/pdf/service_support/release_notes/NCP_Secure_Clients/NCP_Secure_Entry_Client/NCP_RN_Win_Secure_Entry_Client_11_14_r42039_en.pdf
Products affected by CVE-2017-17023
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cpe:2.3:a:ncp-e:ncp_secure_entry_client:10.11
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cpe:2.3:a:sophos:ipsec_client:11.04