CVE-2021-34709— Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Image Verification Vulnerabilities
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 Software 存在数据伪造问题漏洞，该漏洞允许经过身份验证的远程攻击者覆盖和读取任意本地设备上的文件。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-34709
Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Image Verification Vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for Cisco 8000 Series Routers could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XR 数据伪造问题漏洞
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 Software 存在数据伪造问题漏洞，该漏洞允许经过身份验证的远程攻击者覆盖和读取任意本地设备上的文件。
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-2021-34709
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-34709 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwn vendor-advisory x_refsource_CISCO
Same Patch Batch · Cisco · 2021-09-09 · 13 CVEs total
| CVE-2021-34720 | 8.6 HIGH | Cisco IOS XR Software IP Service Level Agreements and Two-Way Active Measurement Protocol |
| CVE-2021-34718 | 8.1 HIGH | Cisco IOS XR Software Arbitrary File Read and Write Vulnerability |
| CVE-2021-34728 | 7.8 HIGH | Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities |
| CVE-2021-34719 | 7.8 HIGH | Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities |
| CVE-2021-34713 | 7.4 HIGH | Cisco IOS XR Software for ASR 9000 Series Routers Denial of Service Vulnerability |
| CVE-2021-34722 | 6.7 MEDIUM | Cisco IOS XR Software Command Injection Vulnerabilities |
| CVE-2021-34721 | 6.7 MEDIUM | Cisco IOS XR Software Command Injection Vulnerabilities |
| CVE-2021-34786 | 6.5 MEDIUM | Cisco BroadWorks CommPilot Application Software Vulnerabilities |
| CVE-2021-34785 | 6.5 MEDIUM | Cisco BroadWorks CommPilot Application Software Vulnerabilities |
| CVE-2021-34708 | 6.0 MEDIUM | Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Ima |
| CVE-2021-34737 | 5.8 MEDIUM | Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability |
| CVE-2021-34771 | 5.5 MEDIUM | Cisco IOS XR Software Unauthorized Information Disclosure Vulnerability |
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