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CVE-2021-34585— CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)

Quick assessment

Affected
CODESYS CODESYS V2
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.

CODESYS是德国3S-Smart Software Solutions的一套控制器开发系统 CODESYS V2 web server 1.1.9.22 之前版本存在代码问题漏洞，该漏洞源于精心制作的web服务器请求可能会触发解析器错误。因为软件并不是在所有条件下都检查解析器结果，所以可能会发生带有无效地址的指针解引用。这就导致了拒绝服务的情况。

CVSS 7.5 · High EPSS 0.93% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-34585

Vulnerability Information
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Vulnerability Title
CODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests can trigger a parser error. Since the parser result is not checked under all conditions, a pointer dereference with an invalid address can occur. This leads to a denial of service situation.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
CODESYS代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CODESYS是德国3S-Smart Software Solutions的一套控制器开发系统 CODESYS V2 web server 1.1.9.22 之前版本存在代码问题漏洞，该漏洞源于精心制作的web服务器请求可能会触发解析器错误。因为软件并不是在所有条件下都检查解析器结果，所以可能会发生带有无效地址的指针解引用。这就导致了拒绝服务的情况。
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
CODESYS CODESYS V2 all web servers ~ V1.1.9.22 -

II. Public POCs for CVE-2021-34585

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III. Intelligence Information for CVE-2021-34585

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Other References for CVE-2021-34585 (2)

Same Patch Batch · CODESYS · 2021-10-26 · 7 CVEs total

CVE-2021-34584 9.1 CRITICAL CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)
CVE-2021-34595 8.1 HIGH CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
CVE-2021-34593 7.5 HIGH CODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-service
CVE-2021-34586 7.5 HIGH CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS)
CVE-2021-34583 7.5 HIGH CODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS)
CVE-2021-34596 6.5 MEDIUM CODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-service

IV. Related Vulnerabilities

Same product: CODESYS V2
Same vendor: CODESYS
Same weakness: CWE-252

V. Comments for CVE-2021-34585

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