Vulnerability-Lookup

ALSA-2021:4743

Vulnerability from osv_almalinux – Published: 2021-11-18 16:29 – Updated: 2021-11-21 06:08 – Source website

Summary

Moderate: llvm-toolset:rhel8 security update

Details

LLVM Toolset provides the LLVM compiler infrastructure framework, the Clang compiler for the C and C++ languages, the LLDB debugger, and related tools for code analysis.

Security Fix(es):

Developer environment: Unicode's bidirectional (BiDi) override characters can cause trojan source attacks (CVE-2021-42574)

The following changes were introduced in clang in order to facilitate detection of BiDi Unicode characters:

clang-tidy now finds identifiers that contain Unicode characters with right-to-left direction, which can be confusing as they may change the understanding of a whole statement.

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

https://vulners.com/cve/CVE-2021-42574

REPORT

JSON

To clipboard

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  "details": "LLVM Toolset provides the LLVM compiler infrastructure framework, the Clang compiler for the C and C++ languages, the LLDB debugger, and related tools for code analysis.\n\nSecurity Fix(es):\n\n* Developer environment: Unicode\u0027s bidirectional (BiDi) override characters can cause trojan source attacks (CVE-2021-42574)\n\nThe following changes were introduced in clang in order to facilitate detection of BiDi Unicode characters:\n\nclang-tidy now finds identifiers that contain Unicode characters with right-to-left direction, which can be confusing as they may change the understanding of a whole statement.\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "ALSA-2021:4743",
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  "published": "2021-11-18T16:29:15Z",
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CVE-2021-42574 (GCVE-0-2021-42574)

Vulnerability from cvelistv5 – Published: 2021-11-01 00:00 – Updated: 2024-08-04 03:38 Disputed

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.

Severity

No CVSS data available.

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-06-11 15:16 UTC

CWE

Assigner

mitre mitre root

References

18 references

URL	Tags
http://www.unicode.org/versions/Unicode14.0.0/
https://trojansource.codes
http://www.openwall.com/lists/oss-security/2021/11/01/1	mailing-list
http://www.openwall.com/lists/oss-security/2021/11/01/4	mailing-list
http://www.openwall.com/lists/oss-security/2021/11/01/6	mailing-list
http://www.openwall.com/lists/oss-security/2021/11/01/5	mailing-list
http://www.openwall.com/lists/oss-security/2021/1…	mailing-list
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://www.kb.cert.org/vuls/id/999008	third-party-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://www.scyon.nl/post/trojans-in-your-source-code
https://www.unicode.org/reports/tr36/
https://www.unicode.org/reports/tr39/
https://www.unicode.org/reports/tr31/
https://www.unicode.org/reports/tr9/tr9-44.html#HL4
https://www.starwindsoftware.com/security/sw-2022…
https://security.gentoo.org/glsa/202210-09	vendor-advisory

Show details on NVD website

JSON

To clipboard

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        "dateUpdated": "2022-10-16T00:00:00.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "http://www.unicode.org/versions/Unicode14.0.0/"
        },
        {
          "url": "https://trojansource.codes"
        },
        {
          "name": "[oss-security] 20211101 CVE-2021-42574: rustc 1.56.0 and bidirectional-override codepoints in source code",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/11/01/1"
        },
        {
          "name": "[oss-security] 20211101 Re: CVE-2021-42574: rustc 1.56.0 and bidirectional-override codepoints in source code",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/11/01/4"
        },
        {
          "name": "[oss-security] 20211101 Trojan Source Attacks",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/11/01/6"
        },
        {
          "name": "[oss-security] 20211102 Re: CVE-2021-42574: rustc 1.56.0 and bidirectional-override codepoints in source code",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/11/01/5"
        },
        {
          "name": "[oss-security] 20211102 Re: Trojan Source Attacks",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/11/02/10"
        },
        {
          "name": "FEDORA-2021-0578e23912",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUPA37D57VPTDLSXOOGF4UXUEADOC4PQ/"
        },
        {
          "name": "FEDORA-2021-7ad3a01f6a",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LQNTFF24ROHLVPLUOEISBN3F7QM27L4U/"
        },
        {
          "name": "VU#999008",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.kb.cert.org/vuls/id/999008"
        },
        {
          "name": "FEDORA-2021-443139f67c",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IH2RG5YTR6ZZOLUV3EUPZEIJR7XHJLVD/"
        },
        {
          "url": "https://www.scyon.nl/post/trojans-in-your-source-code"
        },
        {
          "url": "https://www.unicode.org/reports/tr36/"
        },
        {
          "url": "https://www.unicode.org/reports/tr39/"
        },
        {
          "url": "https://www.unicode.org/reports/tr31/"
        },
        {
          "url": "https://www.unicode.org/reports/tr9/tr9-44.html#HL4"
        },
        {
          "url": "https://www.starwindsoftware.com/security/sw-20220804-0002/"
        },
        {
          "name": "GLSA-202210-09",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202210-09"
        }
      ],
      "tags": [
        "disputed"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-42574",
    "datePublished": "2021-11-01T00:00:00.000Z",
    "dateReserved": "2021-10-18T00:00:00.000Z",
    "dateUpdated": "2024-08-04T03:38:49.283Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

ALSA-2021:4743

CVE-2021-42574 (GCVE-0-2021-42574)

Tags

Sightings

Nomenclature

Related by attack behaviour