CVE-2021-31888
Quick assessment
Affected
Siemens APOGEE MBC (PPC) (BACnet)
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.
Siemens Nucleus ReadyStart是德国Siemens公司的一个捆绑式解决方案。用于加速完整系统的快速启动并提供丰富的板级支持包 (Bsp) Siemens Nucleus ReadyStart 存在缓冲区错误漏洞，该漏洞源于 FTP 服务器没有正确验证 MKD/XMKD 命令的长度，导致基于堆栈的缓冲区溢出。这可能会导致拒绝服务条件和远程代码执行。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-31888
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BACnet) (All versions), APOGEE MEC (PPC) (P2 Ethernet) (All versions), APOGEE PXC Compact (BACnet) (All versions < V3.5.4), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.4), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.19), Desigo PXC00-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC00-U (All versions >= V2.3 and < V6.30.016), Desigo PXC001-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC100-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC12-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC128-U (All versions >= V2.3 and < V6.30.016), Desigo PXC200-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC36.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC50-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC64-U (All versions >= V2.3 and < V6.30.016), Desigo PXM20-E (All versions >= V2.3 and < V6.30.016), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus Source Code (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). FTP server does not properly validate the length of the “MKD/XMKD” command, leading to stack-based buffer overflows. This may result in Denial-of-Service conditions and Remote Code Execution. (FSMD-2021-0018)
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的空终结符
Source: CVE Program / CVE List V5
Vulnerability Title
Siemens Nucleus ReadyStart 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Siemens Nucleus ReadyStart是德国Siemens公司的一个捆绑式解决方案。用于加速完整系统的快速启动并提供丰富的板级支持包 (Bsp) Siemens Nucleus ReadyStart 存在缓冲区错误漏洞，该漏洞源于 FTP 服务器没有正确验证 MKD/XMKD 命令的长度，导致基于堆栈的缓冲区溢出。这可能会导致拒绝服务条件和远程代码执行。
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 |
|---|---|---|---|---|
| Siemens | APOGEE MBC (PPC) (BACnet) | All versions | - |
|
| Siemens | APOGEE MBC (PPC) (P2 Ethernet) | All versions | - |
|
| Siemens | APOGEE MEC (PPC) (BACnet) | All versions | - |
|
| Siemens | APOGEE MEC (PPC) (P2 Ethernet) | All versions | - |
|
| Siemens | APOGEE PXC Compact (BACnet) | All versions < V3.5.4 | - |
|
| Siemens | APOGEE PXC Compact (P2 Ethernet) | All versions < V2.8.19 | - |
|
| Siemens | APOGEE PXC Modular (BACnet) | All versions < V3.5.4 | - |
|
| Siemens | APOGEE PXC Modular (P2 Ethernet) | All versions < V2.8.19 | - |
|
| Siemens | Desigo PXC00-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC00-U | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC001-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC100-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC12-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC128-U | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC200-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC22-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC22.1-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC36.1-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC50-E.D | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXC64-U | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Desigo PXM20-E | All versions >= V2.3 and < V6.30.016 | - |
|
| Siemens | Nucleus NET | All versions | - |
|
| Siemens | Nucleus ReadyStart V3 | All versions < V2017.02.4 | - |
|
| Siemens | Nucleus Source Code | All versions | - |
|
| Siemens | TALON TC Compact (BACnet) | All versions < V3.5.4 | - |
|
| Siemens | TALON TC Modular (BACnet) | All versions < V3.5.4 | - |
|
II. Public POCs for CVE-2021-31888
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-31888 (2)
-
https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf x_refsource_MISC
-
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.pdf x_refsource_MISC
Same Patch Batch · Siemens · 2021-11-09 · 25 CVEs total
| CVE-2021-40358 | 9.9 CRITICAL | Siemens SIMATIC PCS 7和SIMATIC WinCC 路径遍历漏洞 |
| CVE-2021-31346 | 8.2 HIGH | Siemens Nucleus 安全漏洞 |
| CVE-2021-40359 | 7.7 HIGH | Siemens SIMATIC PCS 7和SIMATIC WinCC 路径遍历漏洞 |
| CVE-2021-31345 | 7.5 HIGH | Siemens Nucleus 安全漏洞 |
| CVE-2021-31890 | 7.5 HIGH | Siemens Nucleus ReadyStart 安全漏洞 |
| CVE-2021-31889 | 7.5 HIGH | Siemens Nucleus 数字错误漏洞 |
| CVE-2021-31881 | 7.1 HIGH | Siemens Nucleus ReadyStart 缓冲区错误漏洞 |
| CVE-2021-31883 | 7.1 HIGH | Siemens Nucleus ReadyStart 缓冲区错误漏洞 |
| CVE-2021-31882 | 6.5 MEDIUM | Siemens Nucleus 缓冲区错误漏洞 |
| CVE-2021-40364 | 5.5 MEDIUM | Siemens SIMATIC PCS 7和SIMATIC WinCC 日志信息泄露漏洞 |
| CVE-2021-31344 | 5.3 MEDIUM | Siemens Nucleus ReadyStart 安全漏洞 |
| CVE-2021-31886 | Siemens Nucleus ReadyStart 缓冲区错误漏洞 | |
| CVE-2020-10052 | SIMATIC RTLS 日志信息泄露漏洞 | |
| CVE-2020-10053 | SIMATIC RTLS 安全漏洞 | |
| CVE-2020-10054 | SIMATIC RTLS 输入验证错误漏洞 | |
| CVE-2021-31884 | Siemens Nucleus ReadyStart 安全漏洞 | |
| CVE-2021-31885 | Siemens Nucleus ReadyStart 安全漏洞 | |
| CVE-2021-42026 | Siemens Mendix 安全漏洞 | |
| CVE-2021-31887 | Siemens Nucleus ReadyStart 缓冲区错误漏洞 | |
| CVE-2021-37207 | Siemens Sentron Powermanager 安全漏洞 |
Showing top 20 of 25 CVEs. View all on vendor page → →
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V. Comments for CVE-2021-31888
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