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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS and IOS XE TFTP Memory Management Error Lets Remote Users Cause the Target System to Crash
SecurityTracker Alert ID:  1033023
SecurityTracker URL:  http://securitytracker.com/id/1033023
CVE Reference:   CVE-2015-0681   (Links to External Site)
Date:  Jul 22 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco IOS and IOS XE. A remote user can cause the target system to crash.

A remote user can send multiple TFTP requests to the target device to trigger a memory management flaw and cause the target device to hang or reload.

Systems with the TFTP server enabled are affected.

Cisco has assigned bug ID CSCts66733 to this vulnerability.

Impact:   A remote user can cause the target device to hang or crash.
Solution:   The vendor has issued a fix.

A patch matrix is available in the vendor's advisory.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150722-tftp

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150722-tftp (Links to External Site)
Cause:   Resource error

Message History:   None.


 Source Message Contents

Date:  Wed, 22 Jul 2015 12:01:57 -0400
Subject:  Cisco Security Advisory: Cisco IOS Software TFTP Server Denial of Service Vulnerability

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Cisco Security Advisory: Cisco IOS Software TFTP Server Denial of Service Vulnerability

Advisory ID: cisco-sa-2015722-tftp

Revision 1.0

For Public Release 2015 July 22 16:00 UTC (GMT)

------------------------------------------------------------------------------------------

Summary
=======

A vulnerability in the TFTP server feature of Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The TFTP server feature is not enabled by default.

Cisco has released software updates that address this vulnerability.

Workarounds that mitigate this vulnerability are available.

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150722-tftp
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