rhsa-2015_1154
Vulnerability from csaf_redhat
Published
2015-06-23 09:09
Modified
2024-11-22 09:02
Summary
Red Hat Security Advisory: libreswan security, bug fix and enhancement update

Notes

Topic
Updated libreswan packages that fix one security issue, several bugs and add two 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 certain IKEv1 payloads. A remote attacker could send specially crafted IKEv1 payloads that, when processed, would lead to a denial of service (daemon crash). (CVE-2015-3204) Red Hat would like to thank Javantea for reporting this issue. This update fixes the following bugs: * Previously, the programs/pluto/state.h and programs/pluto/kernel_netlink.c files had a maximum SELinux context size of 257 and 1024 respectively. These restrictions set by libreswan limited the size of the context that can be exchanged by pluto (the IPSec daemon) when using a Labeled Internet Protocol Security (IPsec). The SElinux labels for Labeled IPsec have been extended to 4096 bytes and the mentioned restrictions no longer exist. (BZ#1198650) * On some architectures, the kernel AES_GCM IPsec algorithm did not work properly with acceleration drivers. On those kernels, some acceleration modules are added to the modprobe blacklist. However, Libreswan was ignoring this blacklist, leading to AES_GCM failures. This update adds support for the module blacklist to the libreswan packages and thus prevents the AES_GCM failures from occurring. (BZ#1208022) * An IPv6 issue has been resolved that prevented ipv6-icmp Neighbour Discovery from working properly once an IPsec tunnel is established (and one endpoint reboots). When upgrading, ensure that /etc/ipsec.conf is loading all /etc/ipsec.d/*conf files using the /etc/ipsec.conf "include" statement, or explicitly include this new configuration file in /etc/ipsec.conf. (BZ#1208023) * A FIPS self-test prevented libreswan from properly starting in FIPS mode. This bug has been fixed and libreswan now works in FIPS mode as expected. (BZ#1211146) In addition, this update adds the following enhancements: * A new option "seedbits=" has been added to pre-seed the Network Security Services (NSS) pseudo random number generator (PRNG) function with entropy from the /dev/random file on startup. This option is disabled by default. It can be enabled by setting the "seedbits=" option in the "config setup" section in the /etc/ipsec.conf file. (BZ#1198649) * The build process now runs a Cryptographic Algorithm Validation Program (CAVP) certification test on the Internet Key Exchange version 1 and 2 (IKEv1 and IKEv2) PRF/PRF+ functions. (BZ#1213652) 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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        "category": "summary",
        "text": "Updated libreswan packages that fix one security issue, several bugs and\nadd two 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 certain\nIKEv1 payloads. A remote attacker could send specially crafted IKEv1\npayloads that, when processed, would lead to a denial of service (daemon\ncrash). (CVE-2015-3204)\n\nRed Hat would like to thank Javantea for reporting this issue.\n\nThis update fixes the following bugs:\n\n* Previously, the programs/pluto/state.h and\nprograms/pluto/kernel_netlink.c files had a maximum SELinux context size\nof 257 and 1024 respectively. These restrictions set by libreswan limited\nthe size of the context that can be exchanged by pluto (the IPSec daemon)\nwhen using a Labeled Internet Protocol Security (IPsec). The SElinux\nlabels for Labeled IPsec have been extended to 4096 bytes and the\nmentioned restrictions no longer exist. (BZ#1198650)\n\n* On some architectures, the kernel AES_GCM IPsec algorithm did not work\nproperly with acceleration drivers. On those kernels, some acceleration\nmodules are added to the modprobe blacklist. However, Libreswan was\nignoring this blacklist, leading to AES_GCM failures. This update adds\nsupport for the module blacklist to the libreswan packages and thus\nprevents the AES_GCM failures from occurring. (BZ#1208022)\n\n* An IPv6 issue has been resolved that prevented ipv6-icmp Neighbour\nDiscovery from working properly once an IPsec tunnel is established (and\none endpoint reboots). When upgrading, ensure that /etc/ipsec.conf is\nloading all /etc/ipsec.d/*conf files using the /etc/ipsec.conf \"include\"\nstatement, or explicitly include this new configuration file in\n/etc/ipsec.conf. (BZ#1208023)\n\n* A FIPS self-test prevented libreswan from properly starting in FIPS mode.\nThis bug has been fixed and libreswan now works in FIPS mode as expected.\n(BZ#1211146)\n\nIn addition, this update adds the following enhancements:\n\n* A new option \"seedbits=\" has been added to pre-seed the Network Security\nServices (NSS) pseudo random number generator (PRNG) function with entropy\nfrom the /dev/random file on startup. This option is disabled by default.\nIt can be enabled by setting the \"seedbits=\" option in the \"config setup\"\nsection in the /etc/ipsec.conf file. (BZ#1198649)\n\n* The build process now runs a Cryptographic Algorithm Validation Program\n(CAVP) certification test on the Internet Key Exchange version 1 and 2\n(IKEv1 and IKEv2) PRF/PRF+ functions. (BZ#1213652)\n\nAll libreswan users are advised to upgrade to these updated packages,\nwhich contain backported patches to correct these issues and add these\nenhancements.",
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    {
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        {
          "names": [
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          ]
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      "cve": "CVE-2015-3204",
      "cwe": {
        "id": "CWE-617",
        "name": "Reachable Assertion"
      },
      "discovery_date": "2015-05-19T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1223361"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was discovered in the way Libreswan\u0027s IKE daemon processed certain IKEv1 payloads. A remote attacker could send specially crafted IKEv1 payloads that, when processed, would lead to a denial of service (daemon crash).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "libreswan: crafted IKE packet causes daemon restart",
          "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"
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          "category": "external",
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        },
        {
          "category": "external",
          "summary": "https://libreswan.org/security/CVE-2015-3204/CVE-2015-3204-libreswan.patch",
          "url": "https://libreswan.org/security/CVE-2015-3204/CVE-2015-3204-libreswan.patch"
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          "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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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "libreswan: crafted IKE packet causes daemon restart"
    }
  ]
}


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