PT-2019-8172 · Sophos+1 · Sophos Ipsec Client+1

Published 2019-04-09 · Updated 2019-10-03 · CVE-2017-17023

Positive Technologies (AI Summary)

CVSS v2.0

9.3

High

Base vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Sophos IPSec Client version 11.04 NCP Secure Entry Client version 10.11 r32792

Description 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 issue arises because the VPN client requests update metadata over an insecure HTTP connection and does not check if the software update is signed before running it. The affected client software is related to SIC V11.04-64.exe, NCP EntryCl Windows x86 1004 31799.exe, and ncpmon.exe.

Recommendations For Sophos IPSec Client version 11.04, consider disabling the software update feature until a patch is available. For NCP Secure Entry Client version 10.11 r32792, restrict access to the update metadata to minimize the risk of exploitation. As a temporary workaround, avoid using the software update feature in the affected VPN client until the issue is resolved.

Fix

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-345

Related Identifiers

CVE-2017-17023

Affected Products

Ncp Secure Entry Client

Sophos Ipsec Client

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2017-17023 · Security Note
• https://ncp-e.com/en/resources/download-vpn-client/#c8680 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-17023 · Vendor Advisory
• https://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 · Vendor Advisory