VAR-200312-0365
Vulnerability from variot - Updated: 2025-04-03 22:37Cisco IOS 12.0 through 12.2, when IP routing is disabled, accepts false ICMP redirect messages, which allows remote attackers to cause a denial of service (network routing modification). It has been reported that it is possible to make arbitrary remote modifications to the Cisco IOS routing table. ICMP redirect messages are normally sent to indicate inefficient routing, a new route or a routing change. An attacker may specify a default gateway on the local network that does not exist, thus denying service to the affected router for traffic destined to any location outside the local subnet. Internet Operating System (IOS) is an operating system used on CISCO routers. Another possibility is to advertise that the gateway is on a completely different subnet. If a device proxyes ARP requests for this fake gateway, all communications destined for external subnets will be forwarded to the fake gateway. And if there is no device acting as an ARP request agent for the fake gateway, the information described in the first case will be blocked. A final possibility is for a malicious user to insert the default gateway as the IP address of the attacker's machine, which could lead to interception of all communications
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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