CVE-2021-42574
Vulnerability from cvelistv5
Published
2021-11-01 00:00
Modified
2024-08-04 03:38
Severity ?
Summary
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.
References
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2021/11/01/1Exploit, Mailing List, Mitigation, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2021/11/01/4Exploit, Mailing List, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2021/11/01/5Mailing 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.openwall.com/lists/oss-security/2021/11/02/10Mailing List
cve@mitre.orghttp://www.unicode.org/versions/Unicode14.0.0/Release Notes, Vendor Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IH2RG5YTR6ZZOLUV3EUPZEIJR7XHJLVD/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LQNTFF24ROHLVPLUOEISBN3F7QM27L4U/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUPA37D57VPTDLSXOOGF4UXUEADOC4PQ/
cve@mitre.orghttps://security.gentoo.org/glsa/202210-09Third Party Advisory
cve@mitre.orghttps://trojansource.codesExploit, Technical Description, Third 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, Mitigation, Third Party Advisory
cve@mitre.orghttps://www.starwindsoftware.com/security/sw-20220804-0002/Third Party Advisory
cve@mitre.orghttps://www.unicode.org/reports/tr31/Technical Description, Vendor 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
cve@mitre.orghttps://www.unicode.org/reports/tr9/tr9-44.html#HL4Technical Description, Vendor Advisory
Impacted products
n/an/a
Show details on NVD website

To clipboard 

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Resource\"]},{\"url\":\"https://www.scyon.nl/post/trojans-in-your-source-code\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Mitigation\",\"Third Party Advisory\"]},{\"url\":\"https://www.starwindsoftware.com/security/sw-20220804-0002/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.unicode.org/reports/tr31/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Technical Description\",\"Vendor Advisory\"]},{\"url\":\"https://www.unicode.org/reports/tr36/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Technical Description\",\"Vendor Advisory\"]},{\"url\":\"https://www.unicode.org/reports/tr39/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Technical Description\",\"Vendor Advisory\"]},{\"url\":\"https://www.unicode.org/reports/tr9/tr9-44.html#HL4\",\"source\":\"cve@mitre.org\",\"tags\":[\"Technical Description\",\"Vendor Advisory\"]}]}}"
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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