ZyXel Prestige 642R Router WAN Port Filter Bypass Vulnerability

Bugtraq ID:	3346
Class:	Design Error
CVE:	CVE-2001-1135
Remote:	Yes
Local:	No
Published:	Sep 18 2001 12:00AM
Updated:	Jul 11 2009 07:56AM
Credit:	This vulnerability was discovered and posted to BugTraq by Kistler Ueli <[email protected]>.
Vulnerable:	ZyXEL Prestige 642R
Not Vulnerable:

ZyXel Prestige 642R Router WAN Port Filter Bypass Vulnerability

ZyXel Prestige Routers allow administrators to filter ports on both the WAN and LAN interfaces. By default, the filters are set to block WAN IP addresses access to the Telnet administration interface on TCP port 23, and FTP access on TCP port 21.

An administrator can also set up a filter on the LAN interface in order to block internal network users from accessing these administration interfaces.

The WAN interface does not filter internal IP addresses from these ports, however, allowing an internal attacker to access the administration interface by connecting to the router's WAN IP address.

ZyXel Prestige 642R Router WAN Port Filter Bypass Vulnerability

Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

ZyXel Prestige 642R Router WAN Port Filter Bypass Vulnerability

ZyXel Prestige 642R Router WAN Port Filter Bypass Vulnerability

References:

• ZyXEL Total Internet Access Solution (ZyXEL)