rhsa-2017_2732
Vulnerability from csaf_redhat
Published
2017-09-14 13:57
Modified
2024-11-14 23:37
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
An update for kernel is now available for Red Hat Enterprise Linux 6.2 Advanced 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
The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * 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 stack buffer overflow flaw was found in the way the Bluetooth subsystem of the Linux kernel processed pending L2CAP configuration responses from a client. On systems with the stack protection feature enabled in the kernel (CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other than s390x and ppc64[le]), an unauthenticated attacker able to initiate a connection to a system via Bluetooth could use this flaw to crash the system. Due to the nature of the stack protection feature, code execution cannot be fully ruled out, although we believe it is unlikely. On systems without the stack protection feature (ppc64[le]; the Bluetooth modules are not built on s390x), an unauthenticated attacker able to initiate a connection to a system via Bluetooth could use this flaw to remotely execute arbitrary code on the system with ring 0 (kernel) privileges. (CVE-2017-1000251, Important) Red Hat would like to thank Ari Kauppi for reporting CVE-2017-7895 and Armis Labs for reporting CVE-2017-1000251. Bug Fix(es): * Previously, while the MAP_GROWSDOWN flag was set, writing to the memory which was mapped with the mmap system call failed with the SIGBUS signal. This update fixes memory management in the Linux kernel by backporting an upstream patch that enlarges the stack guard page gap. As a result, mmap now works as expected under the described circumstances. (BZ#1474720)
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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      "threats": [
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          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: NFSv3 server does not properly handle payload bounds checking of WRITE requests"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Armis Labs"
          ]
        }
      ],
      "cve": "CVE-2017-1000251",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "discovery_date": "2017-09-05T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1489716"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A stack buffer overflow flaw was found in the way the Bluetooth subsystem of the Linux kernel processed pending L2CAP configuration responses from a client. On systems with the stack protection feature enabled in the kernel (CONFIG_CC_STACKPROTECTOR=y, which is enabled on all architectures other than s390x and ppc64[le]), an unauthenticated attacker able to initiate a connection to a system via Bluetooth could use this flaw to crash the system. Due to the nature of the stack protection feature, code execution cannot be fully ruled out, although we believe it is unlikely. On systems without the stack protection feature (ppc64[le]; the Bluetooth modules are not built on s390x), an unauthenticated attacker able to initiate a connection to a system via Bluetooth could use this flaw to remotely execute arbitrary code on the system with ring 0 (kernel) privileges.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: stack buffer overflow in the native Bluetooth stack",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This 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 and 7, and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise MRG 2 will address this issue.\n\nFor further information please refer to the vulnerability article in the Customer Portal: https://access.redhat.com/security/vulnerabilities/blueborne",
          "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": {
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2017-1000251"
        },
        {
          "category": "external",
          "summary": "RHBZ#1489716",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1489716"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2017-1000251",
          "url": "https://www.cve.org/CVERecord?id=CVE-2017-1000251"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-1000251",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-1000251"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/blogs/product-security/posts/blueborne",
          "url": "https://access.redhat.com/blogs/product-security/posts/blueborne"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/vulnerabilities/blueborne",
          "url": "https://access.redhat.com/security/vulnerabilities/blueborne"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/solutions/3177231",
          "url": "https://access.redhat.com/solutions/3177231"
        },
        {
          "category": "external",
          "summary": "https://www.armis.com/blueborne/",
          "url": "https://www.armis.com/blueborne/"
        }
      ],
      "release_date": "2017-09-12T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2017-09-14T13:57:58+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.",
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            "vectorString": "AV:A/AC:H/Au:N/C:C/I:C/A:C",
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            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          "details": "Important"
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      ],
      "title": "kernel: stack buffer overflow in the native Bluetooth stack"
    }
  ]
}


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