rhsa-2017_0402
Vulnerability from csaf_redhat
Published
2017-03-02 16:04
Modified
2024-11-14 21:42
Summary
Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement 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 issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKET_V3 ring buffer. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this flaw to elevate their privileges on the system. (CVE-2016-8655, Important) Red Hat would like to thank Philip Pettersson for reporting this issue. Enhancement(s): * Previously, the Broadcom bnx2x driver in the MRG kernel-rt used an incorrect PTP Hardware Clock (PHC) timer divisor value, which broke Precision Time Protocol (PTP) timestamping due to an unstable clock. This update corrects the divisor value, and the PTP timestamping is now accurate, with monotonically increasing timestamp values. (BZ#1411139)
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.


To clipboard 

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  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Philip Pettersson"
          ]
        }
      ],
      "cve": "CVE-2016-8655",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "discovery_date": "2016-11-30T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1400019"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A race condition issue leading to a use-after-free flaw was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization while creating the TPACKET_V3 ring buffer. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this flaw to elevate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Race condition in packet_set_ring leads to use after free",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect Red Hat Enterprise Linux 5 and 6.\n\nThis issue does affect Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. Future updates for the respective releases will address this issue.\n\nIn a default or common use of Red Hat Enterprise Linux 7 this issue does not allow an unprivileged local user elevate their privileges on the system.\n\nIn order to exploit this issue the attacker needs CAP_NET_RAW capability, which needs to be granted by the administrator to the attacker\u0027s account. Since Red Hat Enterprise Linux 7 does not have unprivileged user namespaces enabled by default, local unprivileged users also cannot abuse namespaces to grant this capability to themselves and elevate their privileges.",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2016-8655"
        },
        {
          "category": "external",
          "summary": "RHBZ#1400019",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1400019"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2016-8655",
          "url": "https://www.cve.org/CVERecord?id=CVE-2016-8655"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2016-8655",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-8655"
        }
      ],
      "release_date": "2016-12-06T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2017-03-02T16:04:05+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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            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:M/Au:S/C:C/I:C/A:C",
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            "attackVector": "LOCAL",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:L/AC:H/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 in packet_set_ring leads to use after free"
    }
  ]
}


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