TITLE:
Cisco IOS XR MPLS Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA19740

VERIFY ADVISORY:
http://secunia.com/advisories/19740/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Cisco IOS XR 3.x
http://secunia.com/product/4907/

DESCRIPTION:
Three vulnerabilities have been reported in Cisco IOS XR, which can
be exploited by malicious people to cause a DoS (Denial of Service).

All three vulnerabilities are caused due to unspecified errors within
the processing of MPLS (Multi Protocol Label Switching) packets. This
can be exploited via specially crafted MPLS packets to restart the
NetIO process, which causes a Modular Services Card on a Cisco
Carrier Routing System 1 (CRS-1) or a Line Card on a Cisco 12000
series router to reload.

Successful exploitation requires that MPLS has been configured on the
network device.

SOLUTION:
Apply patches (see patch matrix in vendor advisory).

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20060419-xr.shtml

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