rhsa-2015_1643
Vulnerability from csaf_redhat
Published
2015-08-18 18:38
Modified
2024-11-14 15:28
Summary
Red Hat Security Advisory: kernel security and bug fix update

Notes

Topic
Updated kernel packages that fix one security issue and two bugs are now available for Red Hat Enterprise Linux 6.4 Advanced Update Support. Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
Details
The kernel packages contain the Linux kernel, the core of any Linux operating system. * It was found that the Linux kernel's ping socket implementation did not properly handle socket unhashing during spurious disconnects, which could lead to a use-after-free flaw. On x86-64 architecture systems, a local user able to create ping sockets could use this flaw to crash the system. On non-x86-64 architecture systems, a local user able to create ping sockets could use this flaw to escalate their privileges on the system. (CVE-2015-3636, Moderate) This update also fixes the following bugs: * Due to bad memory or memory corruption, an isolated BUG_ON(mm->nr_ptes) was sometimes reported, indicating that not all the page tables allocated could be found and freed when the exit_mmap() function cleared the user address space. As a consequence, a kernel panic occurred. To fix this bug, the BUG_ON() function has been replaced by WARN_ON(), which prevents the kernel from panicking in the aforementioned situation. (BZ#1235929) * Previously, it was for the ext4 driver to read a metadata block and use it without a verification. If the metadata block was corrupted, a kernel panic could occur. With this update, verification is forced on every buffer before it is used, which uncovers possible corruption and prevents further use of the corrupted metadata buffer. (BZ#1242930) All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.
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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        "text": "Updated kernel packages that fix one security issue and two bugs are now\navailable for Red Hat Enterprise Linux 6.4 Advanced Update Support.\n\nRed Hat Product Security has rated this update as having Moderate security\nimpact. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available from the CVE link in the\nReferences section.",
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        "text": "The kernel packages contain the Linux kernel, the core of any Linux\noperating system.\n\n* It was found that the Linux kernel\u0027s ping socket implementation did not\nproperly handle socket unhashing during spurious disconnects, which could\nlead to a use-after-free flaw. On x86-64 architecture systems, a local user\nable to create ping sockets could use this flaw to crash the system.\nOn non-x86-64 architecture systems, a local user able to create ping\nsockets could use this flaw to escalate their privileges on the system.\n(CVE-2015-3636, Moderate)\n\nThis update also fixes the following bugs:\n\n* Due to bad memory or memory corruption, an isolated BUG_ON(mm-\u003enr_ptes)\nwas sometimes reported, indicating that not all the page tables allocated\ncould be found and freed when the exit_mmap() function cleared the user\naddress space. As a consequence, a kernel panic occurred. To fix this bug,\nthe BUG_ON() function has been replaced by WARN_ON(), which prevents the\nkernel from panicking in the aforementioned situation. (BZ#1235929)\n\n* Previously, it was for the ext4 driver to read a metadata block and use\nit without a verification. If the metadata block was corrupted, a kernel\npanic could occur. With this update, verification is forced on every buffer\nbefore it is used, which uncovers possible corruption and prevents further\nuse of the corrupted metadata buffer. (BZ#1242930)\n\nAll kernel users are advised to upgrade to these updated packages, which\ncontain backported patches to correct these issues. The system must be\nrebooted for this update to take effect.",
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      "cwe": {
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        "name": "Use After Free"
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          "text": "1218074"
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          "text": "It was found that the Linux kernel\u0027s ping socket implementation did not properly handle socket unhashing during spurious disconnects, which could lead to a use-after-free flaw. On x86-64 architecture systems, a local user able to create ping sockets could use this flaw to crash the system. On non-x86-64 architecture systems, a local user able to create ping sockets could use this flaw to escalate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: ping sockets: use-after-free leading to local privilege escalation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue does not affect the Linux kernel as shipped with Red Hat Enterprise Linux 5. This issue does affect the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for the respective releases will address this issue.\n\nPlease note that on x86-64 architecture systems the impact is limited to local Denial of Service and that the ping sockets functionality is disabled by default (net.ipv4.ping_group_range sysctl is \"1\t0\").",
          "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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          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "cvss_v2": {
            "accessComplexity": "HIGH",
            "accessVector": "LOCAL",
            "authentication": "SINGLE",
            "availabilityImpact": "COMPLETE",
            "baseScore": 6.0,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "COMPLETE",
            "vectorString": "AV:L/AC:H/Au:S/C:C/I:C/A:C",
            "version": "2.0"
          },
          "products": [
            "6Server-6.4.AUS:kernel-0:2.6.32-358.65.1.el6.src",
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            "6Server-optional-6.4.AUS:kernel-debuginfo-common-x86_64-0:2.6.32-358.65.1.el6.x86_64",
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            "6Server-optional-6.4.AUS:perf-debuginfo-0:2.6.32-358.65.1.el6.x86_64",
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            "6Server-optional-6.4.AUS:python-perf-debuginfo-0:2.6.32-358.65.1.el6.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: ping sockets: use-after-free leading to local privilege escalation"
    }
  ]
}


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