{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Moderate" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for lasso is now available for Red Hat Enterprise Linux 8.\n\nRed 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.", "title": "Topic" }, { "category": "general", "text": "The lasso packages provide the Lasso library that implements the Liberty Alliance Single Sign-On standards, including the SAML and SAML2 specifications. It allows handling of the whole life-cycle of SAML-based federations and provides bindings for multiple languages.\n\nSecurity Fix(es):\n\n* lasso: XML signature wrapping vulnerability when parsing SAML responses (CVE-2021-28091)\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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.", "title": "Details" }, { "category": "legal_disclaimer", "text": "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.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2021:4325", "url": "https://access.redhat.com/errata/RHSA-2021:4325" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#moderate", "url": "https://access.redhat.com/security/updates/classification/#moderate" }, { "category": "external", "summary": "https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/", "url": "https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/" }, { "category": "external", "summary": "1829785", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1829785" }, { "category": "external", "summary": "1940089", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1940089" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_4325.json" } ], "title": "Red Hat Security Advisory: lasso security and enhancement update", "tracking": { "current_release_date": "2026-06-26T19:14:46+00:00", "generator": { "date": "2026-06-26T19:14:46+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.2.6" } }, "id": "RHSA-2021:4325", "initial_release_date": "2021-11-09T18:12:42+00:00", "revision_history": [ { "date": "2021-11-09T18:12:42+00:00", "number": "1", "summary": "Initial version" }, { "date": "2021-11-09T18:12:42+00:00", "number": "2", "summary": "Last updated 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"CWE-347", "name": "Improper Verification of Cryptographic Signature" }, "discovery_date": "2021-03-16T00:00:00+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "1940089" } ], "notes": [ { "category": "description", "text": "An XML Signature Wrapping (XSW) vulnerability was found in Lasso. This flaw allows an attacker to modify a valid SAML response to include an unsigned SAML assertion, which may be used to impersonate another valid user recognized by the service using Lasso. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.", "title": "Vulnerability description" }, { "category": "summary", "text": "lasso: XML signature wrapping vulnerability when parsing SAML responses", "title": "Vulnerability summary" }, { "category": "other", "text": "Lasso is provided in Red Hat Enterprise Linux 7, and 8 only as a dependency of mod_auth_mellon, without development files. The way mod_auth_mellon uses Lasso makes it not vulnerable to this flaw, because SAML responses are additionally validated to have exactly one assertion, thus it is not possible for an attacker to include an unsigned SAML assertion after a signed valid one. For this reason this flaw has been rated as Moderate on Red Hat Enterprise Linux 8.\n\nRed Hat Enterprise Linux 7 also provides a lasso-python package that can be used to create python applications that use Lasso, however Red Hat only ships ipsilon which uses it. Ipsilon does not use the vulnerable functions of Lasso. Considering the presence of lasso-python in Red Hat Enterprise Linux 7, this flaw has been rated as Important there.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.aarch64", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.i686", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.ppc64le", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.s390x", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.x86_64", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.aarch64", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.i686", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.ppc64le", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.s390x", 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"none" }, "url": "https://access.redhat.com/errata/RHSA-2021:4325" } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "products": [ "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.aarch64", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.i686", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.ppc64le", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.s390x", "AppStream-8.5.0.GA:java-lasso-debuginfo-0:2.6.0-12.el8.x86_64", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.aarch64", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.i686", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.ppc64le", "AppStream-8.5.0.GA:lasso-0:2.6.0-12.el8.s390x", 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