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CVE-2021-42574 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  8.3 HIGH
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2021/11/01/1 Exploit  Mailing List  Mitigation  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/11/01/4 Exploit  Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/11/01/5 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/11/01/6 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/11/02/10 Mailing List 
http://www.unicode.org/versions/Unicode14.0.0/ Release Notes  Vendor Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IH2RG5YTR6ZZOLUV3EUPZEIJR7XHJLVD/ Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LQNTFF24ROHLVPLUOEISBN3F7QM27L4U/ Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QUPA37D57VPTDLSXOOGF4UXUEADOC4PQ/ Mailing List  Third Party Advisory 
https://trojansource.codes Exploit  Technical Description  Third Party Advisory 
https://www.kb.cert.org/vuls/id/999008 Third Party Advisory  US Government Resource 
https://www.scyon.nl/post/trojans-in-your-source-code Exploit  Mitigation  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-94 Improper Control of Generation of Code ('Code Injection') cwe source acceptance level NIST  

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Change History

12 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-42574
NVD Published Date:
11/01/2021
NVD Last Modified:
11/30/2021
Source:
MITRE