CVE-2021-34718— Cisco IOS XR Software Arbitrary File Read and Write Vulnerability
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I. Basic Information for CVE-2021-34718
Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software Arbitrary File Read and Write Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the SSH Server process of Cisco IOS XR Software could allow an authenticated, remote attacker to overwrite and read arbitrary files on the local device. This vulnerability is due to insufficient input validation of arguments that are supplied by the user for a specific file transfer method. An attacker with lower-level privileges could exploit this vulnerability by specifying Secure Copy Protocol (SCP) parameters when authenticating to a device. A successful exploit could allow the attacker to elevate their privileges and retrieve and upload files on a device that they should not have access to.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
参数注入或修改
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco IOS XR 参数注入漏洞
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软件存在参数注入漏洞，该漏洞源于Cisco IOS XR Software的SSH Server进程对于用户为特定文件传输方法提供的参数的输入验证不足。这可能允许经过身份验证的远程攻击者可利用该漏洞覆盖并读取本地设备上的任意文件。具有低级权限的攻击者可利用该漏洞可以通过在对设备进行身份验证时指定安全复制协议(SCP)参数来利用该漏洞。成功的攻击可以让攻击者可利用该漏洞提升他们的权限，并在他们应该
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-2021-34718
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2021-34728 | 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-2021-34709 | 6.0 MEDIUM | Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Ima |
| 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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