Guest

Preview Tool

Cisco Bug: CSCuq31566 - telnetd crash when receiving malformed telnet packet

Last Modified

Aug 07, 2018

Products (7)

  • Cisco Network Convergence System 6000 Series Routers
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

5.0.1.BASE

Description (partial)

Symptoms:
 
A vulnerability in telnetd process of Cisco IOS XR could allow an unauthenticated, remote attacker to cause a reload of the affected service.

The vulnerability is due to improper processing of malformed telnet packet directed to a device configured to process such packets to itself. An attacker could exploit 
this vulnerability by sending a malformed telnet packet to a device that is configured to accept telnet connections to itself and process them for remote management. 
An exploit could allow the attacker to cause a reload of the affected service.
 
Conditions:
Cisco IOS XR device is configured to accept telnet connections for remote management.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.