rhsa-2020_5422
Vulnerability from csaf_redhat
Published
2020-12-15 09:04
Modified
2024-11-05 23:05
Summary
Red Hat Security Advisory: openssl security update

Notes

Topic
An update for openssl is now available for Red Hat Enterprise Linux 8.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. 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
OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library. Security Fix(es): * openssl: EDIPARTYNAME NULL pointer de-reference (CVE-2020-1971) 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.
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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          ]
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          "text": "1903409"
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          "category": "description",
          "text": "A null pointer dereference flaw was found in openssl. A remote attacker, able to control the arguments of the GENERAL_NAME_cmp function, could cause the application, compiled with openssl to crash resulting in a denial of service. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "openssl: EDIPARTYNAME NULL pointer de-reference",
          "title": "Vulnerability summary"
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          "text": "This is a flaw in the GENERAL_NAME_cmp function of openssl which can be triggered when both its arguments are of the same type i.e. EDIPARTYNAME. \n\n1. Red Hat does not ship any applications compiled with openssl, which used the above function in a vulnerable way.\n\n2. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes, when comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in an X509 certificate and when verifying that a timestamp response token signer matches the timestamp authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token). If an attacker can control both items being compared then that attacker could trigger a crash. For example, if the attacker can trick a client or server into checking a malicious certificate against a malicious CRL then a crash may be triggered.\n\nThird party applications compiled with openssl using the function GENERAL_NAME_cmp in a vulnerable way are affected by this flaw.\n\nGENERAL_NAME_cmp was added in 0.9.8k, therefore older versions of openssl are not affected by this flaw.",
          "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-2020-1971"
        },
        {
          "category": "external",
          "summary": "RHBZ#1903409",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1903409"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-1971",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-1971"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-1971",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-1971"
        },
        {
          "category": "external",
          "summary": "https://www.openssl.org/news/secadv/20201208.txt",
          "url": "https://www.openssl.org/news/secadv/20201208.txt"
        }
      ],
      "release_date": "2020-12-08T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-12-15T09:04:53+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\n\nFor the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.",
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            "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",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "openssl: EDIPARTYNAME NULL pointer de-reference"
    }
  ]
}


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