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CVE-2021-34761— Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability

Quick assessment

Affected
Cisco Cisco Firepower Threat Defense 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 Firepower Threat Defense（FTD）是美国思科（Cisco）公司的一套提供下一代防火墙服务的统一软件。 Cisco Firepower Threat Defense Software 存在输入验证错误漏洞，该漏洞源于对特定 CLI 命令的用户输入的验证不完整。攻击者可以通过对具有管理权限的设备进行身份验证并使用精心设计的用户参数发出 CLI 命令来利用此漏洞。成功的利用可能允许攻击者使用root级权限覆盖或附加任意数据到系统文件。

CVSS 4.4 · Medium EPSS 0.21% · P11
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I. Basic Information for CVE-2021-34761

Vulnerability Information
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Vulnerability Title
Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Firepower Threat Defense 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Firepower Threat Defense（FTD）是美国思科（Cisco）公司的一套提供下一代防火墙服务的统一软件。 Cisco Firepower Threat Defense Software 存在输入验证错误漏洞，该漏洞源于对特定 CLI 命令的用户输入的验证不完整。攻击者可以通过对具有管理权限的设备进行身份验证并使用精心设计的用户参数发出 CLI 命令来利用此漏洞。成功的利用可能允许攻击者使用root级权限覆盖或附加任意数据到系统文件。
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 Firepower Threat Defense Software n/a -

II. Public POCs for CVE-2021-34761

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III. Intelligence Information for CVE-2021-34761

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Vendor Advisories for CVE-2021-34761 (1)

Same Patch Batch · Cisco · 2021-10-27 · 20 CVEs total

CVE-2021-40117 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL/TLS D
CVE-2021-40116 8.6 HIGH Multiple Cisco Products Snort Rule Denial of Service Vulnerability
CVE-2021-40118 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Servi
CVE-2021-34793 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Transpare
CVE-2021-34792 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Resource
CVE-2021-34783 8.6 HIGH Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Software-
CVE-2021-34781 8.6 HIGH Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability
CVE-2021-34762 8.1 HIGH Cisco Firepower Management Center Software Authenticated Directory Traversal Vulnerability
CVE-2021-40114 6.8 MEDIUM Multiple Cisco Products Snort Memory Leak Denial of Service Vulnerability
CVE-2021-34755 6.7 MEDIUM Cisco Firepower Threat Defense Software Command Injection Vulnerabilities
CVE-2021-34756 6.7 MEDIUM Cisco Firepower Threat Defense Software Command Injection Vulnerabilities
CVE-2021-34754 5.8 MEDIUM Cisco Firepower Threat Defense Software Ethernet Industrial Protocol Policy Bypass Vulnera
CVE-2021-40125 5.3 MEDIUM Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IKEv2 Sit
CVE-2021-34787 5.3 MEDIUM Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Identity-
CVE-2021-34794 5.3 MEDIUM Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SNMP Acce
CVE-2021-34763 4.8 MEDIUM Cisco Firepower Management Center Software Cross-Site Scripting and Open Redirect Vulnerab
CVE-2021-34764 4.8 MEDIUM Cisco Firepower Management Center Software Cross-Site Scripting and Open Redirect Vulnerab
CVE-2021-34790 4.7 MEDIUM Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Applicati
CVE-2021-34791 4.7 MEDIUM Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Applicati

IV. Related Vulnerabilities

Same product: Cisco Firepower Threat Defense Software
Same vendor: Cisco
Same weakness: CWE-73

V. Comments for CVE-2021-34761

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