csaf_redhat - rhsa-2021

rhsa-2021_4729

Vulnerability from csaf_redhat

Published

2021-11-18 10:04

Modified

2024-11-13 23:36

Summary

Red Hat Security Advisory: devtoolset-11-annobin security update

Notes

Topic

An update for devtoolset-11-annobin is now available for Red Hat Software Collections. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details

Annobin provides a compiler plugin to annotate and tools to examine compiled binary files. 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 annobin in order to facilitate detection of BiDi Unicode characters: This update of annobin adds a new annocheck test to detect the presence of multibyte characters in symbol names. 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.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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          "category": "description",
          "text": "A flaw was found in the way Unicode standards are implemented in the context of development environments, which have specialized requirements for rendering text. An attacker could exploit this to deceive a human reviewer by creating a malicious patch containing well placed BiDi characters. The special handling and rendering of those characters can be then used in an attempt to hide unexpected and potentially dangerous behaviour from the reviewer.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "environment: Unicode\u0027s bidirectional (BiDi) override characters can cause trojan source attacks",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is a flaw with the way Unicode standards are implemented in the context of development environments, which have specialized requirements for rendering text. This is not a flaw in Red Hat products.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-42574"
        },
        {
          "category": "external",
          "summary": "RHBZ#2005819",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2005819"
        },
        {
          "category": "external",
          "summary": "RHSB-2021-007",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-007"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-42574",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-42574"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-42574",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-42574"
        },
        {
          "category": "external",
          "summary": "https://trojansource.codes/",
          "url": "https://trojansource.codes/"
        },
        {
          "category": "external",
          "summary": "https://www.lightbluetouchpaper.org/2021/11/01/trojan-source-invisible-vulnerabilities/",
          "url": "https://www.lightbluetouchpaper.org/2021/11/01/trojan-source-invisible-vulnerabilities/"
        },
        {
          "category": "external",
          "summary": "https://www.unicode.org/reports/tr36/#Bidirectional_Text_Spoofing",
          "url": "https://www.unicode.org/reports/tr36/#Bidirectional_Text_Spoofing"
        },
        {
          "category": "external",
          "summary": "https://www.unicode.org/reports/tr39/",
          "url": "https://www.unicode.org/reports/tr39/"
        }
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      "release_date": "2021-11-01T00:00:00+00:00",
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          "category": "vendor_fix",
          "date": "2021-11-18T10:04:42+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "environment: Unicode\u0027s bidirectional (BiDi) override characters can cause trojan source attacks"
    }
  ]
}

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

▼	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/2021/11/02/10	mailing-list
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUPA37D57VPTDLSXOOGF4UXUEADOC4PQ/	vendor-advisory
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LQNTFF24ROHLVPLUOEISBN3F7QM27L4U/	vendor-advisory
	https://www.kb.cert.org/vuls/id/999008	third-party-advisory
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IH2RG5YTR6ZZOLUV3EUPZEIJR7XHJLVD/	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-20220804-0002/
	https://security.gentoo.org/glsa/202210-09	vendor-advisory

Impacted products

▼	Vendor	Product
	n/a	n/a

Show details on NVD website

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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