CVE-2020-3517— Cisco FXOS and NX-OS Software Cisco Fabric Services Denial of Service Vulnerability
Quick assessment
Affected
Cisco Cisco NX-OS Software
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Cisco NX-OS Software和Cisco FXOS Software都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。 Cisco FXOS Software和Cisco NX-OS Software中的Fabric服务组件存在安全漏洞，该漏洞源于受影响的软件分析Cisco结构服务消息时错误处理不足，攻击者可以利用该漏洞导致拒绝服务攻击。
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-3517
Vulnerability Information
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Vulnerability Title
Cisco FXOS and NX-OS Software Cisco Fabric Services Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Cisco Fabric Services component of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated attacker to cause process crashes, which could result in a denial of service (DoS) condition on an affected device. The attack vector is configuration dependent and could be remote or adjacent. For more information about the attack vector, see the Details section of this advisory. The vulnerability is due to insufficient error handling when the affected software parses Cisco Fabric Services messages. An attacker could exploit this vulnerability by sending malicious Cisco Fabric Services messages to an affected device. A successful exploit could allow the attacker to cause a reload of an affected device, which could result in a DoS condition.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco FXOS Software和Cisco NX-OS Software 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software和Cisco FXOS Software都是美国思科（Cisco）公司的产品。Cisco NX-OS Software是一套交换机使用的数据中心级操作系统软件。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。 Cisco FXOS Software和Cisco NX-OS Software中的Fabric服务组件存在安全漏洞，该漏洞源于受影响的软件分析Cisco结构服务消息时错误处理不足，攻击者可以利用该漏洞导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Cisco | Cisco NX-OS Software | n/a | - |
|
II. Public POCs for CVE-2020-3517
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2020-3517 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-nxos-cfs-dos-dAmnymbd vendor-advisory x_refsource_CISCO
Same Patch Batch · Cisco · 2020-08-27 · 8 CVEs total
| CVE-2020-3504 | 3.3 LOW | Cisco UCS Manager Software Local Management CLI Denial of Service Vulnerability |
| CVE-2020-3338 | Cisco NX-OS Software IPv6 Protocol Independent Multicast Denial of Service Vulnerability | |
| CVE-2020-3394 | Cisco Nexus 3000 and 9000 Series Switches Privilege Escalation Vulnerability | |
| CVE-2020-3397 | Cisco NX-OS Software Border Gateway Protocol Multicast VPN Denial of Service Vulnerability | |
| CVE-2020-3398 | Cisco NX-OS Software Border Gateway Protocol Multicast VPN Session Denial of Service Vulne | |
| CVE-2020-3415 | Cisco NX-OS Software Data Management Engine Remote Code Execution Vulnerability | |
| CVE-2020-3454 | Cisco NX-OS Software Call Home Command Injection Vulnerability |
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V. Comments for CVE-2020-3517
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