csaf_redhat - rhsa-2017

rhsa-2017_2798

Vulnerability from csaf_redhat

Published

2017-09-26 18:00

Modified

2024-09-13 14:42

Summary

Red Hat Security Advisory: kernel security update

Notes

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.5 Advanced Update Support and Red Hat Enterprise Linux 6.5 Telco Extended 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): * A flaw was found in the way the Linux kernel loaded ELF executables. Provided that an application was built as Position Independent Executable (PIE), the loader could allow part of that application's data segment to map over the memory area reserved for its stack, potentially resulting in memory corruption. An unprivileged local user with access to SUID (or otherwise privileged) PIE binary could use this flaw to escalate their privileges on the system. (CVE-2017-1000253, Important) Red Hat would like to thank Qualys Research Labs for reporting this issue.

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": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* A flaw was found in the way the Linux kernel loaded ELF executables. Provided that an application was built as Position Independent Executable (PIE), the loader could allow part of that application\u0027s data segment to map over the memory area reserved for its stack, potentially resulting in memory corruption. An unprivileged local user with access to SUID (or otherwise privileged) PIE binary could use this flaw to escalate their privileges on the system. (CVE-2017-1000253, Important)\n\nRed Hat would like to thank Qualys Research Labs for reporting this issue.",
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          "names": [
            "Qualys Research Labs"
          ]
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      "cve": "CVE-2017-1000253",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "discovery_date": "2017-09-15T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "1492212"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way the Linux kernel loaded ELF executables. Provided that an application was built as Position Independent Executable (PIE), the loader could allow part of that application\u0027s data segment to map over the memory area reserved for its stack, potentially resulting in memory corruption. An unprivileged local user with access to SUID (or otherwise privileged) PIE binary could use this flaw to escalate their privileges on the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: load_elf_ binary() does not take account of the need to allocate sufficient space for the entire binary",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6. This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 prior to kernel version 3.10.0-693, that is Red Hat Enterprise Linux 7.4 GA kernel version. Kernel versions after 3.10.0-693 contain the fix and are thus not vulnerable.\n\nThis issue affects the Linux kernel-rt packages prior to the kernel version 3.10.0-693.rt56.617 (Red Hat Enteprise Linux for Realtime) and 3.10.0-693.2.1.rt56.585.el6rt (Red Hat Enterprise MRG 2). The latest Linux kernel-rt packages as shipped with Red Hat Enterprise Linux for Realtime and Red Hat Enterprise MRG 2 are not vulnerable.\n\nFuture Linux kernel updates for the respective releases will 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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          "restart_required": {
            "category": "machine"
          },
          "url": "https://access.redhat.com/errata/RHSA-2017:2798"
        },
        {
          "category": "workaround",
          "details": "By setting vm.legacy_va_layout to 1 we can effectively disable the exploitation of this issue by switching to the legacy mmap layout. The mmap allocations start much lower in the process address space and follow the bottom-up allocation model. As such, the initial PIE executable mapping is far from the reserved stack area and cannot interfere with the stack.\n\n64-bit processes on Red Hat Enterprise Linux 5 are forced to use the legacy virtual address space layout regardless of the vm.legacy_va_layout value.\n\nNote: Applications that have demands for a large linear address space (such as certain databases) may be unable to handle the legacy memory layout proposed using this mitigation. We recommend to test your systems and applications before deploying this mitigation on production systems.\n\nEdit the /etc/sysctl.conf file as root, and add or amend:\n\n    vm.legacy_va_layout = 1\n    \t\t\t\t\t\t\t\t\n\nTo apply this setting, run the /sbin/sysctl -p command as the root user to reload the settings from /etc/sysctl.conf.\n\nVerify that vm.legacy_va_layout is now set to defined value:\n\n    $ /sbin/sysctl vm.legacy_va_layout\n    vm.legacy_va_layout = 1",
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      "scores": [
        {
          "cvss_v3": {
            "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": "exploit_status",
          "date": "2024-09-09T00:00:00+00:00",
          "details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        },
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: load_elf_ binary() does not take account of the need to allocate sufficient space for the entire binary"
    }
  ]
}

cve-2017-1000253

Vulnerability from cvelistv5

Published

2017-10-04 01:00

Modified

2024-09-10 03:55

Severity

7.8 (High) - cvssV3_1 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

Linux distributions that have not patched their long-term kernels with https://git.kernel.org/linus/a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (committed on April 14, 2015). This kernel vulnerability was fixed in April 2015 by commit a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (backported to Linux 3.10.77 in May 2015), but it was not recognized as a security threat. With CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE enabled, and a normal top-down address allocation strategy, load_elf_binary() will attempt to map a PIE binary into an address range immediately below mm->mmap_base. Unfortunately, load_elf_ binary() does not take account of the need to allocate sufficient space for the entire binary which means that, while the first PT_LOAD segment is mapped below mm->mmap_base, the subsequent PT_LOAD segment(s) end up being mapped above mm->mmap_base into the are that is supposed to be the "gap" between the stack and the binary.

References

URL	Tags
https://access.redhat.com/errata/RHSA-2017:2798	vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2795	vendor-advisory, x_refsource_REDHAT
http://www.securitytracker.com/id/1039434	vdb-entry, x_refsource_SECTRACK
https://access.redhat.com/errata/RHSA-2017:2801	vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2796	vendor-advisory, x_refsource_REDHAT
http://www.securityfocus.com/bid/101010	vdb-entry, x_refsource_BID
https://access.redhat.com/errata/RHSA-2017:2799	vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2794	vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2793	vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2797	vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2017:2802	vendor-advisory, x_refsource_REDHAT
https://www.qualys.com/2017/09/26/cve-2017-1000253/cve-2017-1000253.txt	x_refsource_MISC
https://access.redhat.com/errata/RHSA-2017:2800	vendor-advisory, x_refsource_REDHAT

Impacted products

Vendor	Product
n/a	n/a

Show details on NVD website