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CVE-2021-26727— spx_restservice SubNet_handler_func Multiple Command Injections and Stack-Based Buffer Overflows

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版本存在缓冲区错误漏洞，该漏洞源于其spx_restservice的SubNet_handler_func函数允许攻击者利用命令注入和基于堆的缓冲区溢出导致使用与服务器root用户相同的权限执行任意代码。

CVSS 10.0 · Critical EPSS 2.36% · P82
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I. Basic Information for CVE-2021-26727

Vulnerability Information
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Vulnerability Title
spx_restservice SubNet_handler_func Multiple Command Injections and Stack-Based Buffer Overflows
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple command injections and stack-based buffer overflows vulnerabilities in the SubNet_handler_func function of spx_restservice allow an attacker to execute arbitrary code with the same privileges as the server user (root). 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:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Lanner IAC-AST2500A 缓冲区错误漏洞
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版本存在缓冲区错误漏洞，该漏洞源于其spx_restservice的SubNet_handler_func函数允许攻击者利用命令注入和基于堆的缓冲区溢出导致使用与服务器root用户相同的权限执行任意代码。
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-2021-26727

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III. Intelligence Information for CVE-2021-26727

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Security Blog Posts for CVE-2021-26727 (1)

Other References for CVE-2021-26727 (1)

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

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-2021-44467 5.3 MEDIUM spx_restservice KillDupUsr_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-94

V. Comments for CVE-2021-26727

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