CVE-2020-3398— Cisco NX-OS Software Border Gateway Protocol Multicast VPN Session 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 Border Gateway Protocol (BGP) Multicast VPN (MVPN) 组件存在安全漏洞，该漏洞是由于对特定类型的BGP MVPN更新消息的解析不正确造成的，攻击者可以通过将此
Possible ATT&CK Techniques 2 AI
T1190 · Exploit Public-Facing Application T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2020-3398
Vulnerability Information
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Vulnerability Title
Cisco NX-OS Software Border Gateway Protocol Multicast VPN Session 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 a BGP session to repeatedly reset, causing a partial denial of service (DoS) condition due to the BGP session being down. The vulnerability is due to incorrect parsing of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause the BGP peer connections to reset, which could lead to BGP route instability and impact traffic. The incoming BGP MVPN update message is valid but is parsed incorrectly by the NX-OS device, which could send a corrupted BGP update to the configured BGP peer. 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 Border Gateway Protocol (BGP) Multicast VPN (MVPN) 组件存在安全漏洞，该漏洞是由于对特定类型的BGP MVPN更新消息的解析不正确造成的，攻击者可以通过将此
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-2020-3398
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2020-3398 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp 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-2020-3397 | Cisco NX-OS Software Border Gateway Protocol Multicast VPN Denial of Service Vulnerability | |
| 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-2020-3398
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