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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS XR IPv6 Processing Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1032563
SecurityTracker URL:  http://securitytracker.com/id/1032563
CVE Reference:   CVE-2015-0769   (Links to External Site)
Date:  Jun 11 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1.0, 4.1.1, 4.1.2, 4.2.0
Description:   A vulnerability was reported in Cisco IOS XR for for Cisco CRS-3. A remote user can cause denial of service conditions on the target system.

A remote user can send an IPv6 packet with specially crafted extension headers to trigger an ASIC scan of the Network Processor Unit (NPU) and cause the targetline card to reload.

Both IPv6 transit traffic and IPv6 traffic sent to the device itself can trigger this flaw.

The vendor has assigned bug ID CSCtx03546 to this vulnerability.

Impact:   A remote user can cause the target line card to reload.
Solution:   The vendor has issued a fix (4.2.1). Software Maintenance Updates (SMUs) are available for versions 4.1.x and 4.2.0.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150611-iosxr

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150611-iosxr (Links to External Site)
Cause:   Input validation error

Message History:   None.


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