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.

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.

El Endpoint UTM VPN de Sophos interactúa con el software de cliente proporcionado por NPC Engineering (www.ncp-e.com). El software cliente afectado, "Sophos IPSec Client" versión 11.04 es una versión rebautizada de NCP "Secure Entry Client" versión 10.11 r32792. Una vulnerabilidad en la función software update del cliente VPN permite que un atacante man-in-the-middle (MITM) o man-on-the-side (MOTS) ejecute software malicioso y arbitrario en el equipo de un usuario de destino. Esto está relacionado con SIC_V versión 11.04-64.exe (Sophos), NCP_EntryCl_Windows_x86_1004_31799.exe (NCP) y ncpmon.exe (tanto Sophos como NCP). La vulnerabilidad existe porque: (1) el cliente VPN solicita metadatos de actualización por medio de una conexión HTTP no segura; y (2) el software cliente no comprueba si la actualización de software está firmada previo a ejecutarla.