VAR-200603-0495
Vulnerability from variot - Updated: 2025-04-03 22:18NCP Network Communication Secure Client 8.11 Build 146, and possibly other versions, allows local users to bypass security protections and configure privileged options via a long argument to ncpmon.exe, which provides access to alternate privileged menus, possibly due to a buffer overflow. NCP Secure Client is susceptible to multiple vulnerabilities. The following issues have been identified: - Firewall rules designed to allow only specific applications to access the network may be bypassed. - Some applications are prone to local command-line-argument buffer-overflow vulnerabilities. - The VPN client is susceptible to a remote denial-of-service vulnerability. - The VPN client is susceptible to a local privilege-escalation vulnerability. These issues allow local attackers to gain SYSTEM-level privileges, allowing them to completely compromise affected computers. Remote attackers may consume excessive CPU resources, denying service to legitimate users. NCP Secure Client version 8.11 Build 146 on the Microsoft Windows platform is vulnerable to these issues; other versions may also be affected.
TITLE: NCP Secure Entry Client Two Vulnerabilities
SECUNIA ADVISORY ID: SA19082
VERIFY ADVISORY: http://secunia.com/advisories/19082/
CRITICAL: Less critical
IMPACT: Privilege escalation
WHERE: Local system
SOFTWARE: NCP Secure Entry Client 8.x http://secunia.com/product/8515/
DESCRIPTION: Ramon 'ports' Kukla has reported two vulnerabilities in NCP Secure Entry Cilent, which can be exploited by malicious, local users to gain escalated privileges.
1) A design error in the handling of command line options passed to ncpmon.exe can be exploited to bypass the "Configuration Locks" settings and to make certain configuration changes by running ncpmon.exe with a command line argument of more than 261 characters.
2) Insecure permissions in the installation directory can be exploited by malicious users to create files within the directory. This reportedly can be further exploited by creating a "connect.bat" file that will be run with SYSTEM privileges when a VPN connection is established.
The vulnerabilities have been reported in version 8.11 Build 146. Other versions may also be affected.
SOLUTION: Restrict access to affect systems.
PROVIDED AND/OR DISCOVERED BY: Ramon 'ports' Kukla
ORIGINAL ADVISORY: http://lists.grok.org.uk/pipermail/full-disclosure/2006-March/042640.html
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/secunia_security_advisories/
Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/
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