VAR-200511-0298
Vulnerability from variot - Updated: 2025-04-03 22:13Race condition in Cisco Adaptive Security Appliance (ASA) 7.0(0), 7.0(2), and 7.0(4), when running with an Active/Standby configuration and when the failover LAN interface fails, allows remote attackers to cause a denial of service (standby firewall failure) by sending spoofed ARP responses from an IP address of an active firewall, which prevents the standby firewall from becoming active, aka "failover denial of service.". Cisco Adaptive Security Appliances are prone to a weakness that may cause a denial of service condition in certain circumstances. This issue is due to insufficient validation of ARP responses. This issue reportedly affects Cisco ASA devices running 7.0(0), 7.0(2), and 7.0(4). Other versions may also be affected. The Cisco ASA Series Adaptive Security Appliances are Cisco's purpose-designed solutions that combine the highest security and VPN services with a new Adaptive Identification and Defense (AIM) architecture. Whether the firewall is alive, but not authenticating the response to the request.
The weakness is caused due to the ASA failover testing algorithm failing to properly identify that the active firewall has failed. This can be exploited to prevent the standby firewall from activating via spoofed ARP responses. The failover may also fail to happen if there is another device with the same IP address as the active firewall on the same network subnet.
The weakness has been reported in ASA running 7.0(0), 7.0(2), and 7.0(4).
SOLUTION: The vendor recommends that port security should be configured for all switch ports in the same VLANs as the active and standby firewalls enabled interfaces to prevent an attacker from spoofing the active firewall's interface MAC address.
The firewall log should also be monitored for any IP address collisions.
PROVIDED AND/OR DISCOVERED BY: Amin Tora, ePlus Security Team.
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
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"data": "Race condition in Cisco Adaptive Security Appliance (ASA) 7.0(0), 7.0(2), and 7.0(4), when running with an Active/Standby configuration and when the failover LAN interface fails, allows remote attackers to cause a denial of service (standby firewall failure) by sending spoofed ARP responses from an IP address of an active firewall, which prevents the standby firewall from becoming active, aka \"failover denial of service.\". Cisco Adaptive Security Appliances are prone to a weakness that may cause a denial of service condition in certain circumstances. This issue is due to insufficient validation of ARP responses. \nThis issue reportedly affects Cisco ASA devices running 7.0(0), 7.0(2), and 7.0(4). Other versions may also be affected. The Cisco ASA Series Adaptive Security Appliances are Cisco\u0027s purpose-designed solutions that combine the highest security and VPN services with a new Adaptive Identification and Defense (AIM) architecture. Whether the firewall is alive, but not authenticating the response to the request. \r\n\r\nThe weakness is caused due to the ASA failover testing algorithm\nfailing to properly identify that the active firewall has failed. This can be exploited to prevent\nthe standby firewall from activating via spoofed ARP responses. The\nfailover may also fail to happen if there is another device with the\nsame IP address as the active firewall on the same network subnet. \r\n\r\nThe weakness has been reported in ASA running 7.0(0), 7.0(2), and\n7.0(4). \n\nSOLUTION:\nThe vendor recommends that port security should be configured for all\nswitch ports in the same VLANs as the active and standby firewalls\nenabled interfaces to prevent an attacker from spoofing the active\nfirewall\u0027s interface MAC address. \r\n\r\nThe firewall log should also be monitored for any IP address\ncollisions. \n\nPROVIDED AND/OR DISCOVERED BY:\nAmin Tora, ePlus Security Team. \n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n",
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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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.