Cisco ASA/Firepower Threat Defense IP Fragment Reassembly resource consumption

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CVSS Meta Temp Score
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6.6$0-$5k0.00

A vulnerability was found in Cisco ASA and Firepower Threat Defense (Firewall Software) (affected version not known) and classified as problematic. Affected by this issue is an unknown function of the component IP Fragment Reassembly. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-400. Impacted is availability. CVE summarizes:

A vulnerability in the IP fragment-handling implementation of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a memory leak on an affected device. This memory leak could prevent traffic from being processed through the device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper error handling when specific failures occur during IP fragment reassembly. An attacker could exploit this vulnerability by sending crafted, fragmented IP traffic to a targeted device. A successful exploit could allow the attacker to continuously consume memory on the affected device and eventually impact traffic, resulting in a DoS condition. The device could require a manual reboot to recover from the DoS condition. Note: This vulnerability applies to both IP Version 4 (IPv4) and IP Version 6 (IPv6) traffic.

The weakness was released 10/23/2020. The advisory is shared for download at tools.cisco.com. This vulnerability is handled as CVE-2020-3373 since 12/12/2019. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/25/2020). The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading eliminates this vulnerability.

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VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.6
NVD Vector: 🔒

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Exploitinginfoedit

Class: Denial of service
CWE: CWE-400
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Recommended: Upgrade
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0-Day Time: 🔒

Timelineinfoedit

12/12/2019 CVE assigned
10/23/2020 +315 days Advisory disclosed
10/23/2020 +0 days VulDB entry created
11/25/2020 +33 days VulDB last update

Sourcesinfoedit

Vendor: https://www.cisco.com/

Advisory: tools.cisco.com
Status: Confirmed

CVE: CVE-2020-3373 (🔒)

Entryinfoedit

Created: 10/23/2020 08:59 AM
Updated: 11/25/2020 11:07 PM
Changes: (19) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai source_cve_cna vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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