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VAR-199808-0020

Vulnerability from variot - Updated: 2022-05-17 02:03

Both the Cisco PIX Firewall software as the Context-based Access Control (CBAC) feature of Cisco's IOS Firewall Feature Set do not properly check non-initial fragmented IP packets. Although the non-initial fragmented IP packets might belong to session which would normally be blocked, they are forwarded to the destination host. This may lead to a denial of services (DOS) attack due to the exhaustion of resources required to keep track of the fragmented IP packets. The problem can be fixed by keeping track of the sessions that fragmented IP packets belong to and by blocking non-initial fragmented IP packets for which no initial packet has been seen. The DOS attack can easily be carried out by publically available tools.

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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VAR-199808-0020

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