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CVE-2020-7261— Buffer overwrite in ENS allowed to bypass AMSI protection

Quick assessment

Affected
McAfee LLC McAfee Endpoint Security (ENS)
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.

McAfee Endpoint Security（ENS）是美国迈克菲（McAfee）公司的一套提供智能协作和先进的威胁防御的框架。该框架支持对实时通信的整个威胁防御生命周期进行控制并进行可操作的威胁取证等。 McAfee ENS 10.7.0之前版本中的AMSI组件存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。

CVSS 6.1 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 2 AI

T1211 · Exploitation for Stealth T1562
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I. Basic Information for CVE-2020-7261

Vulnerability Information
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Vulnerability Title
Buffer overwrite in ENS allowed to bypass AMSI protection
Source: CVE Program / CVE List V5
Vulnerability Description
Buffer Overflow via Environment Variables vulnerability in AMSI component in McAfee Endpoint Security (ENS) Prior to 10.7.0 February 2020 Update allows local users to disable Endpoint Security via a carefully crafted user input.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
McAfee Endpoint Security 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
McAfee Endpoint Security（ENS）是美国迈克菲（McAfee）公司的一套提供智能协作和先进的威胁防御的框架。该框架支持对实时通信的整个威胁防御生命周期进行控制并进行可操作的威胁取证等。 McAfee ENS 10.7.0之前版本中的AMSI组件存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。
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
McAfee LLC McAfee Endpoint Security (ENS) 10.x ~ 10.7.0 April 2020 Update -

II. Public POCs for CVE-2020-7261

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III. Intelligence Information for CVE-2020-7261

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Other References for CVE-2020-7261 (1)

Same Patch Batch · McAfee LLC · 2020-04-15 · 11 CVEs total

CVE-2020-7257 8.4 HIGH Privilege Escalation vulnerability through Symbolic links in ENS
CVE-2020-7250 8.2 HIGH ENS symbolic link log file manipulation vulnerability
CVE-2020-7278 7.4 HIGH McAfee firewall rules not enforced correctly
CVE-2020-7277 6.8 MEDIUM McAfee processes not protected
CVE-2020-7273 6.7 MEDIUM Autorun registry bypass
CVE-2020-7259 6.6 MEDIUM Unsigned executable vulnerability in ENS can be used to bypass intended self-protection ru
CVE-2020-7274 6.6 MEDIUM ENS elevated permissions vulnerability
CVE-2020-7276 6.4 MEDIUM Unrestricted Policy Management using MfeUpgradeTool.exe
CVE-2020-7275 4.8 MEDIUM Unquoted service paths for some McAfee ENS files
CVE-2020-7255 3.9 LOW Privilege Escalation vulnerability  in ENS

IV. Related Vulnerabilities

Same product: McAfee Endpoint Security (ENS)
Same vendor: McAfee LLC
Same weakness: CWE-119

V. Comments for CVE-2020-7261

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