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CVE-2020-3408— Cisco IOS and IOS XE Software Split DNS Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS
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 IOS和IOS XE都是美国思科（Cisco）公司的产品。CLI是其中的一个命令行界面。 Cisco IOS 和Cisco IOS XE软件的Split DNS功能存在安全漏洞，该漏洞源于对mDNS数据包的验证不正确造成的。攻击者可利用该漏洞通过尝试解析受影响的设备处理的地址或主机名，导致重新加载设备，从而导致DoS状态。

AI Predicted 7.5 Difficulty: Easy EPSS 1.55% · P74

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-3408

Vulnerability Information
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Vulnerability Title
Cisco IOS and IOS XE Software Split DNS Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Split DNS feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability occurs because the regular expression (regex) engine that is used with the Split DNS feature of affected releases may time out when it processes the DNS name list configuration. An attacker could exploit this vulnerability by trying to resolve an address or hostname that the affected device handles. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS 和 Cisco IOS XE Split DNS 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS和IOS XE都是美国思科（Cisco）公司的产品。CLI是其中的一个命令行界面。 Cisco IOS 和Cisco IOS XE软件的Split DNS功能存在安全漏洞，该漏洞源于对mDNS数据包的验证不正确造成的。攻击者可利用该漏洞通过尝试解析受影响的设备处理的地址或主机名，导致重新加载设备，从而导致DoS状态。
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 IOS n/a -

II. Public POCs for CVE-2020-3408

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III. Intelligence Information for CVE-2020-3408

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Vendor Advisories for CVE-2020-3408 (1)

Same Patch Batch · Cisco · 2020-09-24 · 52 CVEs total

CVE-2020-3141 8.8 HIGH Cisco IOS XE Software Privilege Escalation Vulnerabilities
CVE-2020-3425 8.8 HIGH Cisco IOS XE Software Privilege Escalation Vulnerabilities
CVE-2020-3480 8.6 HIGH Cisco IOS XE Software Zone-Based Firewall Denial of Service Vulnerabilities
CVE-2020-3399 8.6 HIGH Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Se
CVE-2020-3421 8.6 HIGH Cisco IOS XE Software Zone-Based Firewall Denial of Service Vulnerabilities
CVE-2020-3426 7.5 HIGH Cisco IOS Software for Cisco Industrial Routers Virtual-LPWA Unauthorized Access Vulnera
CVE-2020-3465 7.4 HIGH Cisco IOS XE Software Ethernet Frame Denial of Service Vulnerability
CVE-2020-3508 7.4 HIGH Cisco IOS XE Software for Cisco ASR 1000 Series 20-Gbps Embedded Services Processor IP ARP
CVE-2020-3396 6.8 MEDIUM Cisco IOS XE Software IOx Guest Shell USB SSD Namespace Protection Privilege Escalation Vu
CVE-2020-3417 6.8 MEDIUM Cisco IOS XE Software Arbitrary Code Execution Vulnerability
CVE-2020-3513 6.7 MEDIUM Cisco IOS XE Software for Cisco ASR 900 Series Route Switch Processor 3 Arbitrary Code Exe
CVE-2020-3416 6.7 MEDIUM Cisco IOS XE Software for Cisco ASR 900 Series Route Switch Processor 3 Arbitrary Code Exe
CVE-2020-3479 6.1 MEDIUM Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerability
CVE-2020-3393 6.0 MEDIUM Cisco IOS XE Software IOx Application Hosting Privilege Escalation Vulnerability
CVE-2020-3503 6.0 MEDIUM Cisco IOS XE Software Guest Shell Unauthorized File System Access Vulnerability
CVE-2020-3423 5.1 MEDIUM Cisco IOS XE Software Arbitrary Code Execution Vulnerability
CVE-2020-3475 4.3 MEDIUM Cisco IOS XE Software Web Management Framework Vulnerabilities
CVE-2020-3474 4.3 MEDIUM Cisco IOS XE Software Web Management Framework Vulnerabilities
CVE-2020-3428 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family WLAN Local Profilin
CVE-2020-3476 Cisco IOS XE Software Arbitrary File Overwrite Vulnerability

Showing top 20 of 52 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco IOS
Same vendor: Cisco
Same weakness: CWE-185

V. Comments for CVE-2020-3408

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