rhsa-2017_0932
Vulnerability from csaf_redhat
Published
2017-04-12 10:51
Modified
2024-11-14 23:33
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 race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system. (CVE-2017-2636, Important) * A use-after-free flaw was found in the way the Linux kernel's Datagram Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer) resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is set on the socket. A local, unprivileged user could use this flaw to alter the kernel memory, allowing them to escalate their privileges on the system. (CVE-2017-6074, Important) * A flaw was found in the Linux kernel key management subsystem in which a local attacker could crash the kernel or corrupt the stack and additional memory (denial of service) by supplying a specially crafted RSA key. This flaw panics the machine during the verification of the RSA key. (CVE-2016-8650, Moderate) * A flaw was found in the Linux kernel's implementation of setsockopt for the SO_{SND|RCV}BUFFORCE setsockopt() system call. Users with non-namespace CAP_NET_ADMIN are able to trigger this call and create a situation in which the sockets sendbuff data size could be negative. This could adversely affect memory allocations and create situations where the system could crash or cause memory corruption. (CVE-2016-9793, Moderate) * A flaw was found in the Linux kernel's handling of clearing SELinux attributes on /proc/pid/attr files. An empty (null) write to this file can crash the system by causing the system to attempt to access unmapped kernel memory. (CVE-2017-2618, Moderate) Red Hat would like to thank Alexander Popov for reporting CVE-2017-2636; Andrey Konovalov (Google) for reporting CVE-2017-6074; and Ralf Spenneberg for reporting CVE-2016-8650. The CVE-2017-2618 issue was discovered by Paul Moore (Red Hat Engineering). Bug Fix(es): * The kernel-rt packages have been upgraded to version 3.10.0-514.rt56.219, which provides a number of bug fix updates over the previous version. (BZ#1429613)
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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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "details": "Moderate"
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      "title": "kernel: Signed overflow for SO_{SND|RCV}BUFFORCE"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Paul Moore"
          ],
          "organization": "Red Hat Engineering",
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        }
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      "ids": [
        {
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          "text": "1419916"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s handling of clearing SELinux attributes on /proc/pid/attr files. An empty (null) write to this file can crash the system by causing the system to attempt to access unmapped kernel memory.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Off-by-one error in selinux_setprocattr (/proc/self/attr/fscreate)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 due to a missing commit ( bb646cdb12e75d82258c2f2e7746d5952d3e321a ) which enabled changed system behavior.\n\nThis issue does affect Red Hat Enteprise Linux 7 and MRG-2 kernels. A future Linux kernel updates for the respective releases may 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"
        }
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            "availabilityImpact": "HIGH",
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            "baseSeverity": "MEDIUM",
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      "title": "kernel: Off-by-one error in selinux_setprocattr (/proc/self/attr/fscreate)"
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            "Alexander Popov"
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      "cve": "CVE-2017-2636",
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        "name": "Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)"
      },
      "discovery_date": "2017-03-01T00:00:00+00:00",
      "ids": [
        {
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          "text": "1428319"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5.\n\nThis issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. As this issue is rated as Important, it has been scheduled to be fixed in future updates for the respective releases.",
          "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"
        }
      ],
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            "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"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Andrey Konovalov"
          ],
          "organization": "Google"
        }
      ],
      "cve": "CVE-2017-6074",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "discovery_date": "2017-02-17T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1423071"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A use-after-free flaw was found in the way the Linux kernel\u0027s Datagram Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer) resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is set on the socket. A local, unprivileged user could use this flaw to alter the kernel memory, allowing them to escalate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: use after free in dccp protocol",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue affects Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2 kernels.\n\nAs this issue is rated as Important, it has been scheduled to be fixed in a future version of Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2  kernels.",
          "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-2017-6074"
        },
        {
          "category": "external",
          "summary": "RHBZ#1423071",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1423071"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2017-6074",
          "url": "https://www.cve.org/CVERecord?id=CVE-2017-6074"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-6074",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-6074"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/node/2934281",
          "url": "https://access.redhat.com/node/2934281"
        }
      ],
      "release_date": "2017-02-22T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2017-04-12T10:51:03+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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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2017:0932"
        },
        {
          "category": "workaround",
          "details": "Recent versions of the SELinux policy can mitigate this flaw. The steps below will work with SELinux enabled or disabled.\n\nAs the DCCP module will be auto-loaded when required, its use can be disabled \nby preventing the module from loading with the following instructions:\n\n  # echo \"install dccp /bin/true\" \u003e\u003e /etc/modprobe.d/disable-dccp.conf \n \nThe system will need to be restarted if the DCCP modules are loaded. In most circumstances, the DCCP kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.\n\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: use after free in dccp protocol"
    }
  ]
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.