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TITLE:
Cisco IOS Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA29507

VERIFY ADVISORY:
http://secunia.com/advisories/29507/

CRITICAL:
Moderately critical

IMPACT:
Manipulation of data, Exposure of sensitive information, DoS

WHERE:
>From remote

OPERATING SYSTEM:
Cisco IOS 12.x
http://secunia.com/product/182/
Cisco IOS R12.x
http://secunia.com/product/50/

DESCRIPTION:
Some vulnerabilities have been reported in Cisco IOS, which can be
exploited by malicious people to disclose sensitive information,
manipulate certain data, or to cause a DoS (Denial of Service).

1) A memory leak exists in the handling of completed PPTP sessions,
which can be exploited to exhaust memory on an affected system.

2) An error exists in the handling of PPTP sessions when virtual
access interfaces are not removed from the interface descriptor block
(IDB) and are not reused. This can result in an exhaustion of the
interface descriptor block (IDB) limit.

Vulnerabilities #1 and #2 are reported in Cisco IOS versions prior to
12.3 with VPDN enabled.

3) Some errors exist in the Data-Link-Switching (DLSw) feature when
processing UDP and IP protocol 91 packets. This can be exploited to
cause a reload of the system or a memory leak.

4) An error exists in the processing of IPv6 packets, which can be
exploited to prevent the interface from receiving additional traffic
or to cause the device to crash (if RSVP service is configured on the
interface) by sending a specially crafted IPv6 packet to the device.

Successful exploitation of this vulnerability requires that IPv6 and
certain IPv4 UDP services are enabled.

5) An error exists in the implementation of Multicast Virtual Private
Networks (MVPN), which can be exploited to create extra multicast
states on the core routers via specially crafted Multicast
Distribution Tree (MDT) Data Join messages. This can also be
exploited to receive multicast traffic from VPNs that are not
connected to the same Provider Edge (PE).

Successful exploitation of the multicast traffic leak requires that
the attacker knows or guesses the Border Gateway Protocol (BGP)
peering IP address of a remote PE router and the address of the
multicast group that is used in other MPLS VPNs.

SOLUTION:
Update to the fixed version (please see the vendor's advisories for
details).

PROVIDED AND/OR DISCOVERED BY:
1, 2) The vendor credits Martin Kluge of Elxsi Security.
5) The vendor credits Thomas Morin.

ORIGINAL ADVISORY:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20080326-pptp.shtml
http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml
http://www.cisco.com/warp/public/707/cisco-sa-20080326-mvpn.shtml

OTHER REFERENCES:
US-CERT VU#936177:
http://www.kb.cert.org/vuls/id/936177

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
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