CVE-2021-1572— ConfD CLI Secure Shell Server Privilege Escalation Vulnerability
Quick assessment
Affected
Cisco Cisco ConfD
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 ConfD是美国思科（Cisco）公司的一个管理软件。 Cisco ConfD存在安全漏洞，该漏洞源于受影响的软件以特权用户启用CLI的ConfD内置SSH服务器时运行的情况下错误地运行SFTP用户服务。该漏洞允许经过身份验证的本地攻击者在远行ConfD的账户中执行任意命令，并且可以通过对受影响的设备进行身份验证并在SFTP接口发送一系列命令将账户权限提升到特权用户。
Possible ATT&CK Techniques 3 AI
T1548 · Abuse Elevation Control Mechanism T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-1572
Vulnerability Information
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Vulnerability Title
ConfD CLI Secure Shell Server Privilege Escalation Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in ConfD could allow an authenticated, local attacker to execute arbitrary commands at the level of the account under which ConfD is running, which is commonly root. To exploit this vulnerability, an attacker must have a valid account on an affected device. The vulnerability exists because the affected software incorrectly runs the SFTP user service at the privilege level of the account that was running when the ConfD built-in Secure Shell (SSH) server for CLI was enabled. If the ConfD built-in SSH server was not enabled, the device is not affected by this vulnerability. An attacker with low-level privileges could exploit this vulnerability by authenticating to an affected device and issuing a series of commands at the SFTP interface. A successful exploit could allow the attacker to elevate privileges to the level of the account under which ConfD is running, which is commonly root. Note: Any user who can authenticate to the built-in SSH server may exploit this vulnerability. By default, all ConfD users have this access if the server is enabled. Software updates that address this vulnerability have been released.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco ConfD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco ConfD是美国思科（Cisco）公司的一个管理软件。 Cisco ConfD存在安全漏洞，该漏洞源于受影响的软件以特权用户启用CLI的ConfD内置SSH服务器时运行的情况下错误地运行SFTP用户服务。该漏洞允许经过身份验证的本地攻击者在远行ConfD的账户中执行任意命令，并且可以通过对受影响的设备进行身份验证并在SFTP接口发送一系列命令将账户权限提升到特权用户。
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 ConfD | n/a | - |
|
II. Public POCs for CVE-2021-1572
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-1572 (2)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-confd-priv-esc-LsGtCRx4 vendor-advisory x_refsource_CISCO
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-priv-esc-XXqRtTfT vendor-advisory x_refsource_CISCO
Same Patch Batch · Cisco · 2021-08-04 · 7 CVEs total
| CVE-2021-1610 | 9.8 CRITICAL | Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Web Management Vulnera |
| CVE-2021-1609 | 9.8 CRITICAL | Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Web Management Vulnera |
| CVE-2021-1602 | 8.2 HIGH | Cisco Small Business RV160 and RV260 Series VPN Routers Remote Command Execution Vulnerabi |
| CVE-2021-1593 | 7.3 HIGH | Cisco Packet Tracer for Windows DLL Injection Vulnerability |
| CVE-2021-34707 | 6.5 MEDIUM | Cisco Evolved Programmable Network Manager Sensitive Information Disclosure Vulnerability |
| CVE-2021-1522 | 4.3 MEDIUM | Cisco Connected Mobile Experiences Strong Authentication Requirements Enforcement Bypass |
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V. Comments for CVE-2021-1572
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