CVE-2018-0240: Cisco Adaptive Security Appliance Software vulnerability (CVSS 8.6)

Description

Multiple vulnerabilities in the Application Layer Protocol Inspection feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerabilities are due to logical errors during traffic inspection. An attacker could exploit these vulnerabilities by sending a high volume of malicious traffic across an affected device. An exploit could allow the attacker to cause a deadlock condition, resulting in a reload of an affected device. These vulnerabilities affect Cisco ASA Software and Cisco FTD Software configured for Application Layer Protocol Inspection running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCve61540, CSCvh23085, CSCvh95456.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeChanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

Cisco Secure Firewall Threat Defense≥ 6.1.0 ≤ 6.1.0.7 · ≥ 6.2.0 < 6.2.0.5 · ≥ 6.2.1 < 6.2.2.2

Cisco Adaptive Security Appliance Software≥ 9.6.0.0 < 9.6.4.6 · ≥ 9.7.0.0 < 9.7.1.24 · ≥ 9.8.0.0 < 9.8.2.24 · ≥ 9.9.0.0 < 9.9.1.4

Remediation

Fixed in

Cisco Secure Firewall Threat Defense≥ 6.2.0.5

Cisco Adaptive Security Appliance Software≥ 9.6.4.6

Patch & vendor advisories

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect

References

https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01Third Party AdvisoryUS Government Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspectVendor Advisory
http://www.securityfocus.com/bid/103934Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040722Broken LinkThird Party AdvisoryVDB Entry

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2018-0240 being actively exploited?

CVE-2018-0240 is not in the CISA KEV catalog. Its EPSS exploit probability is 3.87%.

How severe is CVE-2018-0240?

CVE-2018-0240 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 3.87% probability of exploitation.

Which products are affected by CVE-2018-0240?

Affected products include Cisco Secure Firewall Threat Defense, Cisco Adaptive Security Appliance Software.

How do I fix CVE-2018-0240?

Upgrade affected software to a fixed version, for example Cisco Secure Firewall Threat Defense 6.2.0.5, Cisco Adaptive Security Appliance Software 9.6.4.6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-0240 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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