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CVE-2021-44467— spx_restservice KillDupUsr_func Broken Access Control

Quick assessment

Affected
Lanner Inc IAC-AST2500A
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.

Lanner IAC-AST2500A是中国立端（Lanner）公司的一个模块和加速卡。适合 Lanner 网络设备，以支持基于 IPMI 标准的系统运行状况远程管理和监控。 Lanner IAC-AST2500A standard firmware 1.00.0版本存在安全漏洞，该漏洞源于其spx_restservice的KillDupUsr_func函数中不正确的访问控制允许攻击者任意终止其他用户的活动会话，导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.66% · P49

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2021-44467

Vulnerability Information
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Vulnerability Title
spx_restservice KillDupUsr_func Broken Access Control
Source: CVE Program / CVE List V5
Vulnerability Description
A broken access control vulnerability in the KillDupUsr_func function of spx_restservice allows an attacker to arbitrarily terminate active sessions of other users, causing a Denial-of-Service (DoS) condition, if an input parameter is correctly guessed. This issue affects: Lanner Inc IAC-AST2500A standard firmware version 1.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Lanner IAC-AST2500A 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lanner IAC-AST2500A是中国立端（Lanner）公司的一个模块和加速卡。适合 Lanner 网络设备，以支持基于 IPMI 标准的系统运行状况远程管理和监控。 Lanner IAC-AST2500A standard firmware 1.00.0版本存在安全漏洞，该漏洞源于其spx_restservice的KillDupUsr_func函数中不正确的访问控制允许攻击者任意终止其他用户的活动会话，导致拒绝服务。
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
Lanner Inc IAC-AST2500A 1.10.0 -

II. Public POCs for CVE-2021-44467

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III. Intelligence Information for CVE-2021-44467

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Security Blog Posts for CVE-2021-44467 (1)

Same Patch Batch · Lanner Inc · 2022-10-24 · 13 CVEs total

CVE-2021-26727 10.0 CRITICAL spx_restservice SubNet_handler_func Multiple Command Injections and Stack-Based Buffer Ove
CVE-2021-26728 10.0 CRITICAL spx_restservice KillDupUsr_func Command Injection and Stack-Based Buffer Overflow
CVE-2021-26729 10.0 CRITICAL spx_restservice Login_handler_func Command Injection and Multiple Stack-Based Buffer Overf
CVE-2021-26730 10.0 CRITICAL spx_restservice Login_handler_func Subfunction Stack-Based Buffer Overflow
CVE-2021-26731 9.1 CRITICAL spx_restservice modifyUserb_func Command Injection and Multiple Stack-Based Buffer Overflo
CVE-2021-26732 6.5 MEDIUM spx_restservice First_network_func Broken Access Control
CVE-2021-44776 6.5 MEDIUM spx_restservice SubNet_handler_func Broken Access Control
CVE-2021-4228 5.8 MEDIUM Hard-coded TLS Certificate
CVE-2021-46279 5.8 MEDIUM Session Fixation and Insufficient Session Expiration
CVE-2021-26733 5.3 MEDIUM spx_restservice FirstReset_handler_func Broken Access Control
CVE-2021-45925 5.3 MEDIUM Username Enumeration
CVE-2021-44769 4.9 MEDIUM TLS Certificate Generation Function Improper Input Validation

IV. Related Vulnerabilities

Same product: IAC-AST2500A
Same vendor: Lanner Inc
Same weakness: CWE-284

V. Comments for CVE-2021-44467

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