CVE-2021-42694
Vulnerability from cvelistv5
Published
2021-11-01 00:00
Modified
2024-10-29 13:41
Severity ?
8.3 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Summary
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.
References
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2021/11/01/1Mailing List, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2021/11/01/6Mailing List, Third Party Advisory
cve@mitre.orghttp://www.unicode.org/versions/Unicode14.0.0/Release Notes, Vendor Advisory
cve@mitre.orghttps://cwe.mitre.org/data/definitions/1007.htmlThird Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202210-09Third Party Advisory
cve@mitre.orghttps://trojansource.codesThird Party Advisory
cve@mitre.orghttps://www.kb.cert.org/vuls/id/999008Third Party Advisory, US Government Resource
cve@mitre.orghttps://www.scyon.nl/post/trojans-in-your-source-codeExploit, Third Party Advisory
cve@mitre.orghttps://www.unicode.org/reports/tr36/Technical Description, Vendor Advisory
cve@mitre.orghttps://www.unicode.org/reports/tr39/Technical Description, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/11/01/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/11/01/6Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.unicode.org/versions/Unicode14.0.0/Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://cwe.mitre.org/data/definitions/1007.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202210-09Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://trojansource.codesThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.kb.cert.org/vuls/id/999008Third Party Advisory, US Government Resource
af854a3a-2127-422b-91ae-364da2661108https://www.scyon.nl/post/trojans-in-your-source-codeExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.unicode.org/reports/tr36/Technical Description, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.unicode.org/reports/tr39/Technical Description, Vendor Advisory
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

{
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              "confidentialityImpact": "HIGH",
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                "options": [
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                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
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    "cna": {
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    "dateReserved": "2021-10-18T00:00:00",
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    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-42694\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2021-11-01T04:15:08.043\",\"lastModified\":\"2024-11-21T06:27:59.337\",\"vulnStatus\":\"Modified\",\"cveTags\":[{\"sourceIdentifier\":\"cve@mitre.org\",\"tags\":[\"disputed\"]}],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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). 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La especificaci\u00f3n permite que un adversario produzca identificadores de c\u00f3digo fuente, tales como nombres de funciones, utilizando homoglifos que son visualmente id\u00e9nticos a un identificador de destino. Los adversarios pueden aprovechar esto para inyectar c\u00f3digo a trav\u00e9s de definiciones de identificadores adversos en dependencias de software ascendente invocadas de forma enga\u00f1osa en software descendente. NOTA: el Consorcio Unicode ofrece el siguiente enfoque alternativo para presentar este problema. Se observa un problema en la naturaleza del texto internacional que puede afectar a las aplicaciones que implementan la compatibilidad con el est\u00e1ndar Unicode (todas las versiones). A menos que se mitigue, un adversario podr\u00eda producir identificadores de c\u00f3digo fuente utilizando caracteres homog\u00e9neos que son visualmente id\u00e9nticos pero distintos a un identificador de destino. 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  }
}


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