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CVE-2021-3956

Quick assessment

Affected
Lenovo XClarity Controller (XCC)
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.

Lenovo XClarity Controller（XCC）是中国联想（Lenovo）公司的一款服务器嵌入式管理引擎，它主要用于标准化和自动化基础服务器管理任务。 Lenovo XClarity Controller存在安全漏洞，该漏洞源于该漏洞影响在 LDAP 身份验证模式下配置并使用支持“未经身份验证绑定”的 LDAP 服务器（例如 Microsoft Active Directory）的 XCC 设备。未经身份验证的用户可以在此类配置中获得对 XCC 的只读访问权限，从而允许查看但不能更改 XCC

CVSS 4.3 · Medium EPSS 0.77% · P54

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2021-3956

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A read-only authentication bypass vulnerability was reported in the Third Quarter 2021 release of Lenovo XClarity Controller (XCC) firmware affecting XCC devices configured in LDAP Authentication Only Mode and using an LDAP server that supports “unauthenticated bind”, such as Microsoft Active Directory. An unauthenticated user can gain read-only access to XCC in such a configuration, thereby allowing the XCC device configuration to be viewed but not changed. XCC devices configured to use local authentication, LDAP Authentication + Authorization Mode, or LDAP servers that support only “authenticated bind” and/or “anonymous bind” are not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Lenovo XClarity Controller 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lenovo XClarity Controller（XCC）是中国联想（Lenovo）公司的一款服务器嵌入式管理引擎，它主要用于标准化和自动化基础服务器管理任务。 Lenovo XClarity Controller存在安全漏洞，该漏洞源于该漏洞影响在 LDAP 身份验证模式下配置并使用支持“未经身份验证绑定”的 LDAP 服务器（例如 Microsoft Active Directory）的 XCC 设备。未经身份验证的用户可以在此类配置中获得对 XCC 的只读访问权限，从而允许查看但不能更改 XCC
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
Lenovo XClarity Controller (XCC) various Third Quarter 2021 releases -

II. Public POCs for CVE-2021-3956

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III. Intelligence Information for CVE-2021-3956

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Vendor Advisories for CVE-2021-3956 (1)

Same Patch Batch · Lenovo · 2022-05-18 · 9 CVEs total

CVE-2021-42850 8.8 HIGH Lenovo Personal Cloud Storage 信任管理问题漏洞
CVE-2021-42852 8.0 HIGH Lenovo Personal Cloud Storage 操作系统命令注入漏洞
CVE-2021-3969 7.8 HIGH Lenovo Vantage 安全漏洞
CVE-2021-3922 7.8 HIGH Lenovo Vantage 竞争条件问题漏洞
CVE-2021-42849 6.8 MEDIUM Lenovo Personal Cloud Storage 授权问题漏洞
CVE-2021-42851 6.3 MEDIUM Lenovo Personal Cloud Storage 安全漏洞
CVE-2022-1110 5.5 MEDIUM Lenovo Smart Standby Driver 安全漏洞
CVE-2021-42848 4.3 MEDIUM Lenovo Personal Cloud Storage 安全漏洞

IV. Related Vulnerabilities

Same product: XClarity Controller (XCC)
Same vendor: Lenovo
Same weakness: CWE-863

V. Comments for CVE-2021-3956

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