rhsa-2015_1979
Vulnerability from csaf_redhat
Published
2015-11-04 08:37
Modified
2024-11-22 09:31
Summary
Red Hat Security Advisory: libreswan security and enhancement update

Notes

Topic
Updated libreswan packages that fix one security issue, several bugs, and add several enhancements are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
Details
Libreswan is an implementation of IPsec & IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN). A flaw was discovered in the way Libreswan's IKE daemon processed IKE KE payloads. A remote attacker could send specially crafted IKE payload with a KE payload of g^x=0 that, when processed, would lead to a denial of service (daemon crash). (CVE-2015-3240) This issue was discovered by Paul Wouters of Red Hat. Note: Please note that when upgrading from an earlier version of Libreswan, the existing CA certificates in the /etc/ipsec.d/cacerts/ directory and the existing certificate revocation list (CRL) files from the /etc/ipsec.d/crls/ directory are automatically imported into the NSS database. Once completed, these directories are no longer used by Libreswan. To install new CA certificates or new CRLS, the certutil and crlutil commands must be used to import these directly into the Network Security Services (NSS) database. This update also adds the following enhancements: * This update adds support for RFC 7383 IKEv2 Fragmentation, RFC 7619 Auth Null and ID Null, INVALID_KE renegotiation, CRL and OCSP support via NSS, AES_CTR and AES_GCM support for IKEv2, CAVS testing for FIPS compliance. In addition, this update enforces FIPS algorithms restrictions in FIPS mode, and runs Composite Application Validation System (CAVS) testing for FIPS compliance during package build. A new Cryptographic Algorithm Validation Program (CAVP) binary can be used to re-run the CAVS tests at any time. Regardless of FIPS mode, the pluto daemon runs RFC test vectors for various algorithms. Furthermore, compiling on all architectures now enables the "-Werror" GCC option, which enhances the security by making all warnings into errors. (BZ#1263346) * This update also fixes several memory leaks and introduces a sub-second packet retransmit option. (BZ#1268773) * This update improves migration support from Openswan to Libreswan. Specifically, all Openswan options that can take a time value without a suffix are now supported, and several new keywords for use in the /etc/ipsec.conf file have been introduced. See the relevant man pages for details. (BZ#1268775) * With this update, loopback support via the "loopback=" option has been deprecated. (BZ#1270673) All Libreswan users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements.
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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        "text": "Updated libreswan packages that fix one security issue, several bugs, and\nadd several enhancements are now available for Red Hat Enterprise Linux 7.\n\nRed Hat Product Security has rated this update as having Moderate security\nimpact. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available from the CVE link in the\nReferences section.",
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        "text": "Libreswan is an implementation of IPsec \u0026 IKE for Linux. IPsec is the\nInternet Protocol Security and uses strong cryptography to provide both\nauthentication and encryption services. These services allow you to build\nsecure tunnels through untrusted networks such as virtual private network\n(VPN).\n\nA flaw was discovered in the way Libreswan\u0027s IKE daemon processed IKE KE\npayloads. A remote attacker could send specially crafted IKE payload with a\nKE payload of g^x=0 that, when processed, would lead to a denial of service\n(daemon crash). (CVE-2015-3240)\n\nThis issue was discovered by Paul Wouters of Red Hat.\n\nNote: Please note that when upgrading from an earlier version of Libreswan,\nthe existing CA certificates in the /etc/ipsec.d/cacerts/ directory and the\nexisting certificate revocation list (CRL) files from the\n/etc/ipsec.d/crls/ directory are automatically imported into the NSS\ndatabase. Once completed, these directories are no longer used by\nLibreswan. To install new CA certificates or new CRLS, the certutil and\ncrlutil commands must be used to import these directly into the Network\nSecurity Services (NSS) database.\n\nThis update also adds the following enhancements:\n\n* This update adds support for RFC 7383 IKEv2 Fragmentation, RFC 7619 Auth\nNull and ID Null, INVALID_KE renegotiation, CRL and OCSP support via NSS,\nAES_CTR and AES_GCM support for IKEv2, CAVS testing for FIPS compliance.\n\nIn addition, this update enforces FIPS algorithms restrictions in FIPS\nmode, and runs Composite Application Validation System (CAVS) testing for\nFIPS compliance during package build. A new Cryptographic Algorithm\nValidation Program (CAVP) binary can be used to re-run the CAVS tests at\nany time. Regardless of FIPS mode, the pluto daemon runs RFC test vectors\nfor various algorithms.\n\nFurthermore, compiling on all architectures now enables the \"-Werror\" GCC\noption, which enhances the security by making all warnings into errors.\n(BZ#1263346)\n\n* This update also fixes several memory leaks and introduces a sub-second\npacket retransmit option. (BZ#1268773)\n\n* This update improves migration support from Openswan to Libreswan.\nSpecifically, all Openswan options that can take a time value without a\nsuffix are now supported, and several new keywords for use in the\n/etc/ipsec.conf file have been introduced. See the relevant man pages for\ndetails. (BZ#1268775)\n\n* With this update, loopback support via the \"loopback=\" option has been\ndeprecated. (BZ#1270673)\n\nAll Libreswan users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues and add these\nenhancements.",
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Paul Wouters"
          ],
          "organization": "Red Hat",
          "summary": "This issue was discovered by Red Hat."
        }
      ],
      "cve": "CVE-2015-3240",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
      },
      "discovery_date": "2015-06-12T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1232320"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was discovered in the way Libreswan\u0027s IKE daemon processed IKE KE payloads. A remote attacker could send specially crafted IKE payload with a KE payload of g^x=0 that, when processed, would lead to a denial of service (daemon crash).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "openswan: denial of service via IKE daemon restart when receiving a bad DH gx value",
          "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"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2015-3240"
        },
        {
          "category": "external",
          "summary": "RHBZ#1232320",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1232320"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2015-3240",
          "url": "https://www.cve.org/CVERecord?id=CVE-2015-3240"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2015-3240",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2015-3240"
        },
        {
          "category": "external",
          "summary": "https://libreswan.org/security/CVE-2015-3240/",
          "url": "https://libreswan.org/security/CVE-2015-3240/"
        }
      ],
      "release_date": "2015-08-25T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2015-11-04T08:37:20+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "openswan: denial of service via IKE daemon restart when receiving a bad DH gx value"
    }
  ]
}


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