Title: Cisco IOS Malformed PPTP Packet Denial of Service Vulnerability
Severity: HIGH
Description:
IOS is router firmware developed and distributed by Cisco Systems. IOS functions on numerous Cisco devices, including routers and switches.
A problem in IOS releases supporting the Point to Point Tunneling Protocol (PPTP) could make it possible for remote users to cause a Cisco router to crash.
PPTP is a protocol that allows users to tunnel to an IP network using a Point to Point Protocol (PPP).
The problem occurs when a malformed PPTP packet is sent to port 1723 on the router. If this occurs, the router must be reset to regain normal functionality.
Affected Products:
- Cisco IOS 12.1E
- Cisco IOS 12.1EZ
- Cisco IOS 12.1T
- Cisco IOS 12.1YA
- Cisco IOS 12.1YC
- Cisco IOS 12.1YD
- Cisco IOS 12.2
- Cisco IOS 12.2T
- Cisco IOS 12.2XA
- Cisco IOS 12.2XD
- Cisco IOS 12.2XE
- Cisco IOS 12.2XH
- Cisco IOS 12.2XQ
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