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CVE-2021-42574

Quick assessment

Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Unicode（通用字符集）是美国统一码联盟（Unicode Consortium）组织的一种通用字符编码标准。用于为世界上每种语言的每个字符和符号分配一个代码。 Unicode Specification 14.0版本及之前版本存在代码注入漏洞，该漏洞源于在现实某些字符时可能存在双向文本欺骗问题。

AI Predicted 6.2 Difficulty: Moderate EPSS 12.21% · P96
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I. Basic Information for CVE-2021-42574

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in the Bidirectional Algorithm in the Unicode Specification through 14.0. It permits the visual reordering of characters via control sequences, which can be used to craft source code that renders different logic than the logical ordering of tokens ingested by compilers and interpreters. Adversaries can leverage this to encode source code for compilers accepting Unicode such that targeted vulnerabilities are introduced invisibly to human reviewers. NOTE: the Unicode Consortium offers the following alternative approach to presenting this concern. An issue is noted in the nature of international text that can affect applications that implement support for The Unicode Standard and the Unicode Bidirectional Algorithm (all versions). Due to text display behavior when text includes left-to-right and right-to-left characters, the visual order of tokens may be different from their logical order. Additionally, control characters needed to fully support the requirements of bidirectional text can further obfuscate the logical order of tokens. Unless mitigated, an adversary could craft source code such that the ordering of tokens perceived by human reviewers does not match what will be processed by a compiler/interpreter/etc. The Unicode Consortium has documented this class of vulnerability in its document, Unicode Technical Report #36, Unicode Security Considerations. The Unicode Consortium also provides guidance on mitigations for this class of issues in Unicode Technical Standard #39, Unicode Security Mechanisms, and in Unicode Standard Annex #31, Unicode Identifier and Pattern Syntax. Also, the BIDI specification allows applications to tailor the implementation in ways that can mitigate misleading visual reordering in program text; see HL4 in Unicode Standard Annex #9, Unicode Bidirectional Algorithm.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Unicode 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Unicode（通用字符集）是美国统一码联盟（Unicode Consortium）组织的一种通用字符编码标准。用于为世界上每种语言的每个字符和符号分配一个代码。 Unicode Specification 14.0版本及之前版本存在代码注入漏洞，该漏洞源于在现实某些字符时可能存在双向文本欺骗问题。
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
- n/a n/a -

II. Public POCs for CVE-2021-42574

# POC Description Source Link Shenlong Link
1 None https://github.com/shiomiyan/CVE-2021-42574 POC Details
2 None https://github.com/hffaust/CVE-2021-42574_and_CVE-2021-42694 POC Details
3 Generate malicious files using recently published bidi-attack (CVE-2021-42574) https://github.com/simplylu/CVE-2021-42574 POC Details
4 Checks your files for existence of Unicode BIDI characters which can be misused for supply chain attacks. See CVE-2021-42574 https://github.com/maweil/bidi_char_detector POC Details
5 A GitHub Action to find Unicode control characters using the Red Hat diagnostic tool https://access.redhat.com/security/vulnerabilities/RHSB-2021-007 to detect RHSB-2021-007 Trojan source attacks (CVE-2021-42574,CVE-2021-42694) https://github.com/pierDipi/unicode-control-characters-action POC Details
6 None https://github.com/waseeld/CVE-2021-42574 POC Details
7 POC of CVE-2021-42574 for solidity and solc compiler https://github.com/tin-z/solidity_CVE-2021-42574-POC POC Details
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III. Intelligence Information for CVE-2021-42574

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Vendor Advisories for CVE-2021-42574 (2)

Mailing List Discussions for CVE-2021-42574 (7)

Other References for CVE-2021-42574 (8)

Same Patch Batch · n/a · 2021-11-01 · 23 CVEs total

CVE-2021-3704 Hp LaserJet Pro Printer 资源管理错误漏洞
CVE-2021-43058 Replicated 输入验证错误漏洞
CVE-2021-20136 ZOHO ManageEngine Log360 访问控制错误漏洞
CVE-2021-26740 Millken DoyoCms 代码问题漏洞
CVE-2021-26739 Millken DoyoCms SQL注入漏洞
CVE-2021-38847 S-cart 代码问题漏洞
CVE-2020-28702 PybbsCms SQL注入漏洞
CVE-2021-3705 HP LaserJet Pro printer 安全漏洞
CVE-2021-29212 HPE IlO Amplifier Pack 路径遍历漏洞
CVE-2021-29213 HPE ProLiant 安全漏洞
CVE-2021-27005 Netapp Clustered Data ONTAP 资源管理错误漏洞
CVE-2021-42694 Unicode 安全漏洞
CVE-2021-3440 HP Print and Scan Doctor 安全漏洞
CVE-2021-27004 Clustered Data ONTAP 安全漏洞
CVE-2021-25878 AVideo 和 YouPHPTube 跨站脚本漏洞
CVE-2021-25877 YouPHPTube 代码注入漏洞
CVE-2021-25876 AVideo 和 YouPHPTube 跨站脚本漏洞
CVE-2021-25875 AVideo 和 YouPHPTube 跨站脚本漏洞
CVE-2021-25874 YouPHPTube SQL注入漏洞
CVE-2021-42557 Jeedom 安全漏洞

Showing top 20 of 23 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a

V. Comments for CVE-2021-42574

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