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CVE-2020-3449— Cisco IOS XR Software Additional Paths Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XR 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 IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR 7.1.3之前版本、7.2.1之前版本和7.3.1之前版本中的BGP Additional Paths功能存在代码问题漏洞。远程攻击者可通过发送BGP更新利用该漏洞造成BGP进程无法处理新的更新，导致拒绝服务。

CVSS 4.3 · Medium EPSS 1.06% · P63
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I. Basic Information for CVE-2020-3449

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software Additional Paths Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Border Gateway Protocol (BGP) additional paths feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent authorized users from monitoring the BGP status and cause the BGP process to stop processing new updates, resulting in a denial of service (DOS) condition. The vulnerability is due to an incorrect calculation of lexicographical order when displaying additional path information within Cisco IOS XR Software, which causes an infinite loop. An attacker could exploit this vulnerability by sending a specific BGP update from a BGP neighbor peer session of an affected device; an authorized user must then issue a show bgp command for the vulnerability to be exploited. A successful exploit could allow the attacker to prevent authorized users from properly monitoring the BGP status and prevent BGP from processing new updates, resulting in outdated information in the routing and forwarding tables.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XR 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR 7.1.3之前版本、7.2.1之前版本和7.3.1之前版本中的BGP Additional Paths功能存在代码问题漏洞。远程攻击者可通过发送BGP更新利用该漏洞造成BGP进程无法处理新的更新，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 IOS XR Software n/a -

II. Public POCs for CVE-2020-3449

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III. Intelligence Information for CVE-2020-3449

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Vendor Advisories for CVE-2020-3449 (1)

Same Patch Batch · Cisco · 2020-08-17 · 17 CVEs total

CVE-2020-3433 7.8 HIGH Cisco AnyConnect Secure Mobility Client for Windows DLL Hijacking Vulnerability
CVE-2020-3500 6.8 MEDIUM Cisco StarOS IPv6 Denial of Service Vulnerability
CVE-2020-3463 6.1 MEDIUM Cisco Webex Meetings Reflected Cross-Site Scripting Vulnerability
CVE-2020-3346 6.1 MEDIUM Cisco Unified Communications Manager Cross-Site Scripting Vulnerability
CVE-2020-3447 5.5 MEDIUM Cisco Email Security Appliance and Cisco Content Security Management Appliance Information
CVE-2020-3435 5.5 MEDIUM Cisco AnyConnect Secure Mobility Client for Windows Profile Modification Vulnerability
CVE-2020-3434 5.5 MEDIUM Cisco AnyConnect Secure Mobility Client for Windows Denial of Service Vulnerability
CVE-2020-3472 5.0 MEDIUM Cisco Webex Meetings User Email Address Information Disclosure Vulnerability
CVE-2020-3464 4.8 MEDIUM Cisco UCS Director Stored Cross-Site Scripting Vulnerability
CVE-2020-3413 4.3 MEDIUM Cisco Webex Meetings Scheduled Meeting Template Deletion Vulnerability
CVE-2020-3412 4.3 MEDIUM Cisco Webex Meetings Scheduled Meeting Template Creation Vulnerability
CVE-2020-3502 4.1 MEDIUM Cisco Webex Meetings Desktop App Information Disclosure Vulnerabilities
CVE-2020-3501 4.1 MEDIUM Cisco Webex Meetings Desktop App Information Disclosure Vulnerabilities
CVE-2020-3448 Cisco Cyber Vision Center Software Access Control Bypass Vulnerability
CVE-2020-3411 Cisco DNA Center Information Disclosure Vulnerability
CVE-2020-3363 Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-754

V. Comments for CVE-2020-3449

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