RHSA-2021:4139

Vulnerability from csaf_redhat - Published: 2021-11-09 17:36 - Updated: 2026-03-21 05:04
Summary
Red Hat Security Advisory: resource-agents security, bug fix, and enhancement update
Severity
Moderate
Notes
Topic: An update for resource-agents is now available for Red Hat Enterprise Linux 8. 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: The resource-agents packages provide the Pacemaker and RGManager service managers with a set of scripts. These scripts interface with several services to allow operating in a high-availability (HA) environment. Security Fix(es): * python-pygments: Infinite loop in SML lexer may lead to DoS (CVE-2021-20270) * python-pygments: ReDoS in multiple lexers (CVE-2021-27291) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.
Terms of Use: 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.
CVE-2021-20270

An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2021:4139
CVE-2021-27291

A denial of service attack was discovered against pygments. Some of the regular expressions used to tokenise source code for highlighting have exponential complexity. A specially crafted input file could cause pygments to take effectively infinite time to parse, consuming CPU resources and denying access to the service.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-400 - Uncontrolled Resource Consumption
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2021:4139
References
https://access.redhat.com/errata/RHSA-2021:4139 self
https://access.redhat.com/security/updates/classi… external
https://access.redhat.com/documentation/en-us/red… external
https://bugzilla.redhat.com/show_bug.cgi?id=1872754 external
https://bugzilla.redhat.com/show_bug.cgi?id=1891883 external
https://bugzilla.redhat.com/show_bug.cgi?id=1902045 external
https://bugzilla.redhat.com/show_bug.cgi?id=1920698 external
https://bugzilla.redhat.com/show_bug.cgi?id=1922136 external
https://bugzilla.redhat.com/show_bug.cgi?id=1924363 external
https://bugzilla.redhat.com/show_bug.cgi?id=1928238 external
https://bugzilla.redhat.com/show_bug.cgi?id=1932863 external
https://bugzilla.redhat.com/show_bug.cgi?id=1934651 external
https://bugzilla.redhat.com/show_bug.cgi?id=1939281 external
https://bugzilla.redhat.com/show_bug.cgi?id=1939992 external
https://bugzilla.redhat.com/show_bug.cgi?id=1940094 external
https://bugzilla.redhat.com/show_bug.cgi?id=1940603 external
https://bugzilla.redhat.com/show_bug.cgi?id=1957765 external
https://bugzilla.redhat.com/show_bug.cgi?id=1969968 external
https://bugzilla.redhat.com/show_bug.cgi?id=1972035 external
https://bugzilla.redhat.com/show_bug.cgi?id=1972743 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2021-20270 self
https://bugzilla.redhat.com/show_bug.cgi?id=1922136 external
https://www.cve.org/CVERecord?id=CVE-2021-20270 external
https://nvd.nist.gov/vuln/detail/CVE-2021-20270 external
https://access.redhat.com/security/cve/CVE-2021-27291 self
https://bugzilla.redhat.com/show_bug.cgi?id=1940603 external
https://www.cve.org/CVERecord?id=CVE-2021-27291 external
https://nvd.nist.gov/vuln/detail/CVE-2021-27291 external
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        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
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          "category": "description",
          "text": "An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the \"exception\" keyword.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python-pygments: Infinite loop in SML lexer may lead to DoS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "In OpenShift Container Platform 3.11, the vulnerable version of python-pygments is embedded in the google-cloud-sdk package, which is shipped in the openshift-ansible container (aos3-installation-container). As the access to the openshift-ansible container is restricted only to cluster administrators, this component is affected but with a Low impact. The google-cloud-sdk package was shipped in OpenShift Container Platform 4.1, which is End of Life.",
          "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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      "cve": "CVE-2021-27291",
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        "id": "CWE-400",
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          "category": "description",
          "text": "A denial of service attack was discovered against pygments.  Some of the regular expressions used to tokenise source code for highlighting have exponential complexity.  A specially crafted input file could cause pygments to take effectively infinite time to parse, consuming CPU resources and denying access to the service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python-pygments: ReDoS in multiple lexers",
          "title": "Vulnerability summary"
        },
        {
          "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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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2021:4139"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "python-pygments: ReDoS in multiple lexers"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.