rhsa-2017_1647
Vulnerability from csaf_redhat
Published
2017-06-28 16:34
Modified
2024-11-05 20:05
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 was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. (CVE-2017-1000364, Important) * The NFS2/3 RPC client could send long arguments to the NFS server. These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program could use this flaw to crash the kernel, resulting in denial of service. (CVE-2017-7645, Important) * The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important) * A flaw was found in the Linux kernel's handling of packets with the URG flag. Applications using the splice() and tcp_splice_read() functionality could allow a remote attacker to force the kernel to enter a condition in which it could loop indefinitely. (CVE-2017-6214, Moderate) Red Hat would like to thank Qualys Research Labs for reporting CVE-2017-1000364 and Ari Kauppi for reporting CVE-2017-7895. Bug Fix(es): * kernel-rt packages have been upgraded to the 3.10.0-514 source tree, which provides a number of bug fixes over the previous version. (BZ#1452745)
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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        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "The Linux Kernel running on AMD64 systems will sometimes map the contents of PIE executable, the heap or ld.so to where the stack is mapped allowing attackers to more easily manipulate the stack. Linux Kernel version 4.11.5 is affected.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Incorrectly mapped contents of PIE executable",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue was part of the stack guard fixes that was fixed along side the CVE-2017-1000364 flaw.  This issue has previously affected Red Hat Enterprise Linux 5,6,7 and MRG-2.  This issue is currently fixed in most versions of shipping products.",
          "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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          "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-debug-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-debug-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-debug-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
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          "6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-514.rt56.228.el6rt.noarch",
          "6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-vanilla-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
          "6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-514.rt56.228.el6rt.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2017-1000379"
        },
        {
          "category": "external",
          "summary": "RHBZ#1462165",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1462165"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2017-1000379",
          "url": "https://www.cve.org/CVERecord?id=CVE-2017-1000379"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-1000379",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-1000379"
        },
        {
          "category": "external",
          "summary": "https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt",
          "url": "https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt"
        }
      ],
      "release_date": "2017-06-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2017-06-28T16:34:27+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": [
            "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-514.rt56.228.el6rt.src",
            "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debuginfo-common-x86_64-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-doc-1:3.10.0-514.rt56.228.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-514.rt56.228.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2017:1647"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 2.9,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.0"
          },
          "products": [
            "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-514.rt56.228.el6rt.src",
            "6Server-MRG-Realtime-2:kernel-rt-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debug-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-debuginfo-common-x86_64-1:3.10.0-514.rt56.228.el6rt.x86_64",
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            "6Server-MRG-Realtime-2:kernel-rt-doc-1:3.10.0-514.rt56.228.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-firmware-1:3.10.0-514.rt56.228.el6rt.noarch",
            "6Server-MRG-Realtime-2:kernel-rt-trace-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-trace-devel-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-debuginfo-1:3.10.0-514.rt56.228.el6rt.x86_64",
            "6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-514.rt56.228.el6rt.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kernel: Incorrectly mapped contents of PIE executable"
    }
  ]
}


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