RHSA-2022:1469

Vulnerability from csaf_redhat - Published: 2022-04-20 14:52 - Updated: 2026-05-29 13:06
Summary
Red Hat Security Advisory: Red Hat Single Sign-On 7.5.2 security update
Severity
Low
Notes
Topic: A security update is now available for Red Hat Single Sign-On 7.5 from the Customer Portal. Red Hat Product Security has rated this update as having a security impact of Low. 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: Red Hat Single Sign-On 7.5 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. This release of Red Hat Single Sign-On 7.5.2 serves as a replacement for Red Hat Single Sign-On 7.5.1, and includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the References. Security Fix(es): * log4j-core: DoS in log4j 2.x with Thread Context Map (MDC) input data contains a recursive lookup and context lookup pattern (CVE-2021-45105) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in 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-2021-45105

A flaw was found in the Apache Log4j logging library 2.x. when the logging configuration uses a non-default Pattern Layout with a Context Lookup. Attackers with control over Thread Context Map (MDC) input data can craft malicious input data that contains a recursive lookup and can cause Denial of Service.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Affected products
Product Identifier Version Remediation
Red Hat Single Sign-On 7
Red Hat / Red Hat Single Sign-On
 cpe:/a:redhat:red_hat_single_sign_on:7 —
Vendor Fix fix
Workaround
Threats
Impact Low
References
To clipboard 

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        "text": "A security update is now available for Red Hat Single Sign-On 7.5 from the Customer Portal.\n\nRed Hat Product Security has rated this update as having a security impact of Low. 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"
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        "text": "Red Hat Single Sign-On 7.5 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications.\n\nThis release of Red Hat Single Sign-On 7.5.2 serves as a replacement for Red Hat Single Sign-On 7.5.1, and includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the References.\n\nSecurity Fix(es):\n\n* log4j-core: DoS in log4j 2.x with Thread Context Map (MDC) input data contains a recursive lookup and context lookup pattern (CVE-2021-45105)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.",
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    "title": "Red Hat Security Advisory: Red Hat Single Sign-On 7.5.2 security update",
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        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
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          "text": "A flaw was found in the Apache Log4j logging library 2.x. when the logging configuration uses a non-default Pattern Layout with a Context Lookup. Attackers with control over Thread Context Map (MDC) input data can craft malicious input data that contains a recursive lookup and can cause Denial of Service.",
          "title": "Vulnerability description"
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          "text": "log4j-core: DoS in log4j 2.x with Thread Context Map (MDC) input data contains a recursive lookup and context lookup pattern",
          "title": "Vulnerability summary"
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          "category": "other",
          "text": "Red Hat Product Security has performed an analysis of this flaw and has classified the Attack Complexity(AC) as High because there are multiple factors involved which are beyond attacker\u0027s control:\n\n- The application has to use the logging configuration using a Context Map Lookup (for example, $${ctx:loginId}) which is a non-default Pattern Layout.\n- The application developer has to use the map org.apache.logging.log4j.ThreadContext in the application code and save at-least one key (for example, ThreadContext.put(\"loginId\", \"myId\");) in the ThreadContext map object.\n- Attackers must also know this saved key name in order to exploit this flaw.\n\nNote that saving keys in this map is a non-essential usage of log4j and just an optional feature provided. Refer to https://logging.apache.org/log4j/2.x/manual/lookups.html#ContextMapLookup to know more about the Context Map Lookup feature of Log4j.\n\nLog4j 1.x is not impacted by this vulnerability. Note that only the log4j-core JAR file is impacted by this vulnerability. Applications using ONLY the log4j-api JAR file without the log4j-core JAR file are NOT impacted by this vulnerability.\n\n\nDespite including a vulnerable version of Log4j 2.x, this vulnerability is not exploitable in Elasticsearch[0], as shipped in OpenShift Container Platform and OpenShift Logging. OpenShift 3.11 specifically does not contain any context lookups:\n\nhttps://github.com/openshift/openshift-ansible/blob/release-3.11/roles/openshift_logging_elasticsearch/templates/log4j2.properties.j2\n\nThis vulnerability is therefore rated Low for Elasticsearch in OpenShift Container Platform and OpenShift Logging.\n\n[0] https://discuss.elastic.co/t/apache-log4j2-remote-code-execution-rce-vulnerability-cve-2021-44228-esa-2021-31/291476#update-december-18-4",
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          "url": "https://access.redhat.com/security/cve/CVE-2021-45105"
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        {
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          "category": "external",
          "summary": "https://issues.apache.org/jira/browse/LOG4J2-3230",
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          "category": "external",
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          "url": "https://logging.apache.org/log4j/2.x/security.html"
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        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2021/12/19/1",
          "url": "https://www.openwall.com/lists/oss-security/2021/12/19/1"
        }
      ],
      "release_date": "2021-12-18T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2022-04-20T14:52:50+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link (you must log in to download the update).",
          "product_ids": [
            "Red Hat Single Sign-On 7"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2022:1469"
        },
        {
          "category": "workaround",
          "details": "For Log4j 2 versions up to and including 2.16.0, this flaw can be mitigated by:\n- In PatternLayout in the Log4j logging configuration, replace Context Lookups like ${ctx:loginId} or $${ctx:loginId} with Thread Context Map patterns (%X, %mdc, or %MDC) like %X{loginId}.\n- Otherwise, in the Log4j logging configuration, remove references to Context Lookups like ${ctx:loginId} or $${ctx:loginId} where they originate from sources external to the application such as HTTP headers or user input.",
          "product_ids": [
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Single Sign-On 7"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "log4j-core: DoS in log4j 2.x with Thread Context Map (MDC) input data contains a recursive lookup and context lookup pattern"
    }
  ]
}


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Sightings

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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.
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