Cisco Firewall Services Module (FWSM) contains a design flaw that may allow corruption of access-lists (ACL). The issue could be triggered by manipulating ACL's which uses object-groups. It is possible that the ACL becomes corrupted and ACE entries to not be elevated at all or out of order, resulting in blocking legitimate traffic and allowing traffic that is normally restricted. This vulnerability results in a loss of integrity and availability.
Classification
Location:
Local Access Required
Attack Type:
Misconfiguration
Impact:
Loss of Integrity,
Loss of Availability
Solution:
Upgrade
Disclosure:
Vendor Verified
OSVDB:
Security Software
Solution
Upgrade to FWSM version 2.3(4.7) or version 3.1(3.1) or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
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