rhsa-2016_1631
Vulnerability from csaf_redhat
Published
2016-08-18 18:22
Modified
2024-11-14 20:48
Summary
Red Hat Security Advisory: realtime-kernel security and bug fix update

Notes

Topic
An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5. 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. It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel's networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network. (CVE-2016-5696, Important) Red Hat would like to thank Yue Cao from Cyber Security Group in the CS department of University of California, Riverside, for reporting this issue.
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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        "relates_to_product_reference": "6Server-MRG-Realtime-2"
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        "category": "default_component_of",
        "full_product_name": {
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          "product_id": "6Server-MRG-Realtime-2:kernel-rt-vanilla-devel-1:3.10.0-327.rt56.195.el6rt.x86_64"
        },
        "product_reference": "kernel-rt-vanilla-devel-1:3.10.0-327.rt56.195.el6rt.x86_64",
        "relates_to_product_reference": "6Server-MRG-Realtime-2"
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    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Yue Cao"
          ],
          "organization": "Cyber Security Group of the CS department of University of California in Riverside"
        }
      ],
      "cve": "CVE-2016-5696",
      "cwe": {
        "id": "CWE-203",
        "name": "Observable Discrepancy"
      },
      "discovery_date": "2016-07-12T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1354708"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "It was found that the RFC 5961 challenge ACK rate limiting as implemented in the Linux kernel\u0027s networking subsystem allowed an off-path attacker to leak certain information about a given connection by creating congestion on the global challenge ACK rate limit counter and then measuring the changes by probing packets. An off-path attacker could use this flaw to either terminate TCP connection and/or inject payload into non-secured TCP connection between two endpoints on the network.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: challenge ACK counter information disclosure.",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4 and 5.",
          "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-2016-5696"
        },
        {
          "category": "external",
          "summary": "RHBZ#1354708",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1354708"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2016-5696",
          "url": "https://www.cve.org/CVERecord?id=CVE-2016-5696"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2016-5696",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-5696"
        },
        {
          "category": "external",
          "summary": "http://lwn.net/Articles/696868/",
          "url": "http://lwn.net/Articles/696868/"
        }
      ],
      "release_date": "2016-07-12T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2016-08-18T18:22:19+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"
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          "url": "https://access.redhat.com/errata/RHSA-2016:1631"
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        {
          "cvss_v2": {
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            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.8,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:P",
            "version": "2.0"
          },
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
            "version": "3.0"
          },
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: challenge ACK counter information disclosure."
    }
  ]
}


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