CVE-2020-3397— Cisco NX-OS Software Border Gateway Protocol Multicast VPN 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是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。TCP（Transmission Control Protocol,传输控制协议）是一种面向连接的、可靠的、基于字节流的传输层通信协议，由IETF的RFC 793定义。 Cisco NX-OS Software 存在安全漏洞，该漏洞源于特定类型的BGP MVPN更新消息的输入验证不完整，攻击者可以利用该漏洞导致受影响设备异常重载进而导致拒绝服务。
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1498 · Network Denial of Service
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I. Basic Information for CVE-2020-3397
Vulnerability Information
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Vulnerability Title
Cisco NX-OS Software Border Gateway Protocol Multicast VPN Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this specific, valid BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause one of the BGP-related routing applications to restart multiple times, leading to a system-level restart. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco NX-OS Software 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。TCP（Transmission Control Protocol,传输控制协议）是一种面向连接的、可靠的、基于字节流的传输层通信协议，由IETF的RFC 793定义。 Cisco NX-OS Software 存在安全漏洞，该漏洞源于特定类型的BGP MVPN更新消息的输入验证不完整，攻击者可以利用该漏洞导致受影响设备异常重载进而导致拒绝服务。
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-2020-3397
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2020-3397 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-nlri-dos-458rG2OQ 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-2020-3517 | Cisco FXOS and NX-OS Software Cisco Fabric Services 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-2020-3398 | 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-2020-3397
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