[NEWS] Cisco Secure ACS Denial Of Service Vulnerability



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Cisco Secure ACS Denial Of Service Vulnerability
------------------------------------------------------------------------


SUMMARY

Cisco Secure ACS does not correctly parse the length of EAP-Response
packets which allows remote attackers to cause a denial of service and
possibly execute arbitrary code.

DETAILS

Vulnerable Systems:
* Cisco Secure ACS that support EAP

A remote attacker (acting as a RADIUS client) could send a specially
crafted EAP Response packet against a Cisco Secure ACS server in such a
way as to cause the CSRadius service to crash (reliable). This bug may be
triggered if the length field of an EAP-Response packet has a certain big
value, greater than the real packet length. Any EAP-Response can trigger
this bug: EAP-Response/Identity, EAP-Response/MD5, EAP-Response/TLS, etc.

An EAP packet is as follows:

0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Code | Identifier | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Identity...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

* For example, the following packet will trigger the vulnerability and
crash CSRadius.exe:

0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 2 | 0 | 0xdddd |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 1 | abcd
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Attack Impact:
Denial-of-service and possibly remote arbitrary code execution

Attack Vector:
Have access as a RADIUS client (knowing or guessing the RADIUS shared
secret) or from an unauthenticated wireless device if the access point
relays malformed EAP frames

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2441>
CVE-2008-2441


ADDITIONAL INFORMATION

The information has been provided by
<mailto:laurent.butti@xxxxxxxxxxxxxxxxxx> Gabriel Campana and Laurent
Butti.
The original article can be found at:
<http://www.cisco.com/warp/public/707/cisco-sr-20080903-csacs.shtml>
http://www.cisco.com/warp/public/707/cisco-sr-20080903-csacs.shtml



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