rhsa-2018_3586
Vulnerability from csaf_redhat
Published
2018-11-13 16:31
Modified
2024-11-15 02:14
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update

Notes

Topic
An update for kernel-rt is now available for Red Hat Enterprise MRG 2. 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
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391) * kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344) * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675) * kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634) 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. Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-693.43.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1632422)
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": "The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)\n\n* kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344)\n\n* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)\n\n* kernel: Integer overflow in Linux\u0027s create_elf_tables function (CVE-2018-14634)\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.\n\nRed Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.\n\nBug Fix(es):\n\n* The kernel-rt packages have been upgraded to the 3.10.0-693.43.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1632422)",
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          "category": "description",
          "text": "The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel doesn\u0027t properly validate the sigevent-\u003esigev_notify field, which leads to out-of-bounds access in the show_timer function.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c",
          "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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          "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\nThe system must be rebooted for this update to take effect.",
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
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            "version": "3.0"
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      "title": "kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c"
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      "acknowledgments": [
        {
          "names": [
            "Juha-Matti Tilli"
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          "organization": "Aalto University - Department of Communications and Networking and Nokia Bell Labs"
        }
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      "cve": "CVE-2018-5391",
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          "text": "A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system.",
          "title": "Vulnerability description"
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          "text": "kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)",
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          "text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/articles/3553061\n\nThis issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64, and Red Hat Enterprise Linux 7 for Power 9. Future kernel updates for the respective releases will address this issue.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, but to a lesser degree. As such, the issue severity for RHEL5 is considered Moderate. This is not currently planned to be addressed in future updates of the product due to its life cycle and the issue severity. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.",
          "title": "Statement"
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          "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.",
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        },
        {
          "category": "external",
          "summary": "RHBZ#1609664",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1609664"
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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2018-5391"
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5391"
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          "category": "external",
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            "userInteraction": "NONE",
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      "title": "kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)"
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    {
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        "id": "CWE-416",
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      },
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      "ids": [
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      "notes": [
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          "text": "The do_get_mempolicy() function in mm/mempolicy.c in the Linux kernel allows local users to hit a use-after-free bug via crafted system calls and thus cause a denial of service (DoS) or possibly have unspecified other impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact",
          "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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        }
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          "date": "2018-11-13T16:31:07+00:00",
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    },
    {
      "acknowledgments": [
        {
          "names": [
            "Qualys Research Labs"
          ]
        }
      ],
      "cve": "CVE-2018-14634",
      "cwe": {
        "id": "CWE-190",
        "name": "Integer Overflow or Wraparound"
      },
      "discovery_date": "2018-08-31T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1624498"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An integer overflow flaw was found in the Linux kernel\u0027s create_elf_tables() function.  An unprivileged local user with access to SUID (or otherwise privileged) binary could use this flaw to escalate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Integer overflow in Linux\u0027s create_elf_tables function",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect 32-bit systems as they do not have a large enough address space to exploit this flaw.\n\nSystems with less than 32GB of memory are very unlikely to be affected by this issue due to memory demands during exploitation.\n\nThis issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5.\n\nThis issue affects the version of the kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 will address this issue.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-14634"
        },
        {
          "category": "external",
          "summary": "RHBZ#1624498",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1624498"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-14634",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-14634"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-14634",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-14634"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/mutagen-astronomy",
          "url": "https://access.redhat.com/security/vulnerabilities/mutagen-astronomy"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2018/09/25/4",
          "url": "https://www.openwall.com/lists/oss-security/2018/09/25/4"
        }
      ],
      "release_date": "2018-09-25T17:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2018-11-13T16:31:07+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\nThe system must be rebooted for this update to take effect.",
          "product_ids": [
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            "6Server-MRG-Realtime-2:kernel-rt-doc-1:3.10.0-693.43.1.rt56.630.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-693.43.1.rt56.630.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-693.43.1.rt56.630.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-693.43.1.rt56.630.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-693.43.1.rt56.630.el6rt.x86_64",
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            "6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-693.43.1.rt56.630.el6rt.x86_64",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2018:3586"
        },
        {
          "category": "workaround",
          "details": "To mitigate the issue:\n\nEnable and install kernel-debuginfo packages as per https://access.redhat.com/solutions/666123\n\n1) On the host, save the following in a file with the \".stp\" extension:\n\n// CVE-2018-14634\n//\n// Theory of operations: adjust the thread\u0027s # rlimit-in-effect around\n// calls to the vulnerable get_arg_page() function so as to encompass\n// the newly required _STK_LIM / 4 * 3 maximum.\n\n// Complication: the rlimit is stored in a current-\u003e structure that\n// is shared across the threads of the process.  They may concurrently\n// invoke this operation.\n\nfunction clamp_stack_rlim_cur:long ()\n%{\n  struct rlimit *rlim = current-\u003esignal-\u003erlim;\n  unsigned long rlim_cur = READ_ONCE(rlim[RLIMIT_STACK].rlim_cur);\n\n  unsigned long limit = _STK_LIM / 4 * 3;\n  limit *= 4; // multiply it back up, to the scale used by rlim_cur\n\n  if (rlim_cur \u003e limit) {\n    WRITE_ONCE(rlim[RLIMIT_STACK].rlim_cur, limit);\n    STAP_RETURN(limit);\n  } else\n    STAP_RETURN(0);\n%}\n\nprobe kernel.function(\"copy_strings\").call\n{\n  l = clamp_stack_rlim_cur()\n   if (l)\n     printf(\"lowered process %s(%d) STACK rlim_cur to %p\\n\",\n            execname(), pid(), l)\n}\n\nprobe begin {\n\tprintf(\"CVE-2018-14634 mitigation loaded\\n\")\n\n}\n\nprobe end {\n\tprintf(\"CVE-2018-14634 mitigation unloaded\\n\")\n}\n\n2) Install the \"systemtap\" package and any required dependencies. Refer\nto the \"2. Using SystemTap\" chapter in the Red Hat Enterprise Linux\n\"SystemTap Beginners Guide\" document, available from docs.redhat.com,\nfor information on installing the required -debuginfo and matching kernel-devel packages\n\n3) Run the \"stap -g [filename-from-step-1].stp\" command as root.\n\nIf the host is rebooted, the changes will be lost and the script must be\nrun again.\n\n\nAlternatively, build the systemtap script on a development system with\n\"stap -g -p 4 [filename-from-step-1].stp\", distribute the resulting\nkernel module to all affected systems, and run \"staprun -L \u003cmodule\u003e\" on those.\nWhen using this approach only systemtap-runtime package is required on\nthe affected systems. Please notice that the kernel version must be the same\nacross all systems.\n\n\nThis may not be a suitable workaround if your application uses massive amounts of stack space. Please consider this if there are any adverse affects when running this mitigation.",
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: Integer overflow in Linux\u0027s create_elf_tables function"
    }
  ]
}


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