rhsa-2021_4158
Vulnerability from csaf_redhat
Published
2021-11-09 18:14
Modified
2024-11-15 11:58
Summary
Red Hat Security Advisory: python-lxml security update

Notes

Topic
An update for python-lxml 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
lxml is an XML processing library providing access to libxml2 and libxslt libraries using the Python ElementTree API. Security Fix(es): * python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS (CVE-2021-28957) 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.


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      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
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          "category": "description",
          "text": "A flaw was found in python-lxml. The HTML5 formaction attribute is not input sanitized like the HTML action attribute is which can lead to a Cross-Site Scripting attack (XSS) when an application uses python-lxml to sanitize user inputs. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
          "title": "Vulnerability description"
        },
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          "text": "python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Web applications vulnerable to this flaw, where a XSS attack can be accomplished, are only those that use python-lxml to sanitize HTML input and that allow user data to be placed in the \"formaction\" attribute of a form button.\n\nIn Red Hat OpenStack Platform, because the flaw has a lower impact and the package is unlikely to be exploited in the RHOSP environment, no update will be provided at this time for the RHOSP python-lxml package.\n\nFor Ansible Tower and Ansible Automation Platform,  Lowering the impact from Moderate to Low as the vulnerable function i.e. lxml HTML Cleaner and the vulnerable attribute i.e. HTML FormAction are not being used.",
          "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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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-28957"
        },
        {
          "category": "external",
          "summary": "RHBZ#1941534",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941534"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-28957",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-28957"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-28957"
        }
      ],
      "release_date": "2021-03-21T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-11-09T18:14:07+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",
          "product_ids": [
            "AppStream-8.5.0.GA:python-lxml-0:4.2.3-3.el8.src",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.aarch64",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.ppc64le",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.s390x",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.x86_64",
            "AppStream-8.5.0.GA:python3-lxml-0:4.2.3-3.el8.aarch64",
            "AppStream-8.5.0.GA:python3-lxml-0:4.2.3-3.el8.ppc64le",
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            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.ppc64le",
            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.s390x",
            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:4158"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "AppStream-8.5.0.GA:python-lxml-0:4.2.3-3.el8.src",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.aarch64",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.ppc64le",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.s390x",
            "AppStream-8.5.0.GA:python-lxml-debugsource-0:4.2.3-3.el8.x86_64",
            "AppStream-8.5.0.GA:python3-lxml-0:4.2.3-3.el8.aarch64",
            "AppStream-8.5.0.GA:python3-lxml-0:4.2.3-3.el8.ppc64le",
            "AppStream-8.5.0.GA:python3-lxml-0:4.2.3-3.el8.s390x",
            "AppStream-8.5.0.GA:python3-lxml-0:4.2.3-3.el8.x86_64",
            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.aarch64",
            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.ppc64le",
            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.s390x",
            "AppStream-8.5.0.GA:python3-lxml-debuginfo-0:4.2.3-3.el8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS"
    }
  ]
}


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