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CVE-2021-42694 Detail

Disputed     

Current Description

An issue was discovered in the character definitions of the Unicode Specification through 14.0. The specification allows an adversary to produce source code identifiers such as function names using homoglyphs that render visually identical to a target identifier. Adversaries can leverage this to inject code via adversarial identifier definitions in upstream software dependencies invoked deceptively in downstream software. 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 (all versions). Unless mitigated, an adversary could produce source code identifiers using homoglyph characters that render visually identical to but are distinct from a target identifier. In this way, an adversary could inject adversarial identifier definitions in upstream software that are not detected by human reviewers and are invoked deceptively in downstream software. The Unicode Consortium has documented this class of security 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.


View Analysis Description

Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2021/11/01/1 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2021/11/01/1 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/2021/11/01/6 Mailing List  Third Party Advisory 
http://www.unicode.org/versions/Unicode14.0.0/ Release Notes  Vendor Advisory 
http://www.unicode.org/versions/Unicode14.0.0/ Release Notes  Vendor Advisory 
https://cwe.mitre.org/data/definitions/1007.html Third Party Advisory 
https://cwe.mitre.org/data/definitions/1007.html Third Party Advisory 
https://security.gentoo.org/glsa/202210-09 Third Party Advisory 
https://security.gentoo.org/glsa/202210-09 Third Party Advisory 
https://trojansource.codes Third Party Advisory 
https://trojansource.codes Third Party Advisory 
https://www.kb.cert.org/vuls/id/999008 Third Party Advisory  US Government Resource 
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  Third Party Advisory 
https://www.scyon.nl/post/trojans-in-your-source-code Exploit  Third Party Advisory 
https://www.unicode.org/reports/tr36/ Technical Description  Vendor Advisory 
https://www.unicode.org/reports/tr36/ Technical Description  Vendor Advisory 
https://www.unicode.org/reports/tr39/ Technical Description  Vendor Advisory 
https://www.unicode.org/reports/tr39/ Technical Description  Vendor Advisory 

Weakness Enumeration

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

Known Affected Software Configurations Switch to CPE 2.2

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Change History

22 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-42694
NVD Published Date:
11/01/2021
NVD Last Modified:
11/21/2024
Source:
MITRE