rhsa-2018_3590
Vulnerability from csaf_redhat
Published
2018-11-13 17:52
Modified
2024-09-13 16:54
Summary
Red Hat Security Advisory: kernel security and bug fix update
Notes
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions.
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 named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)
* kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344)
* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)
* kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.
Bug Fix(es):
* Previously, a kernel panic occurred when the kernel tried to make an out of bound access to the array that describes the L1 Terminal Fault (L1TF) mitigation state on systems without Extended Page Tables (EPT) support. This update extends the array of mitigation states to cover all the states, which effectively prevents out of bound array access. Also, this update enables rejecting invalid, irrelevant values, that might be erroneously provided by the userspace. As a result, the kernel no longer panics in the described scenario. (BZ#1629565)
* Previously, a packet was missing the User Datagram Protocol (UDP) payload checksum during a full checksum computation, if the hardware checksum was not applied. As a consequence, a packet with an incorrect checksum was dropped by a peer. With this update, the kernel includes the UDP payload checksum during the full checksum computation. As a result, the checksum is computed correctly and the packet can be received by the peer. (BZ#1635792)
* Previously, a transform lookup through the xfrm framework could be performed on an already transformed destination cache entry (dst_entry). When using User Datagram Protocol (UDP) over IPv6 with a connected socket in conjunction with Internet Protocol Security (IPsec) in Encapsulating Security Payload (ESP) transport mode. As a consequence, invalid IPv6 fragments transmitted from the host or the kernel occasionally terminated unexpectedly due to a socket buffer (SKB) underrun. With this update, the xfrm lookup on an already transformed dst_entry is not possible. As a result, using UDP iperf utility over IPv6 ESP no longer causes invalid IPv6 fragment transmissions or a kernel panic. (BZ#1639586)
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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"name": "Out-of-bounds Read"
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"discovery_date": "2018-07-27T00:00:00+00:00",
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"text": "1610958"
}
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{
"category": "description",
"text": "The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel doesn\u0027t properly validate the sigevent-\u003esigev_notify field, which leads to out-of-bounds access in the show_timer function.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c",
"title": "Vulnerability summary"
},
{
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2017-18344"
},
{
"category": "external",
"summary": "RHBZ#1610958",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1610958"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2017-18344",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-18344"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2017-18344",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-18344"
}
],
"release_date": "2017-12-15T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2018:3590"
},
{
"category": "workaround",
"details": "Attached to this bugzilla is a systemtap script that will prevent opening (and therefore reading) the /proc/\u003cprocess\u003e/timers file which is used to leak information.\n\nThe SystemTap script is relatively small and efficient, broken into 3 distinct sections as follows:\n\n--------\n\nprobe kernel.function(\"proc_timers_open@fs/proc/base.c\").return { \n // this is -EACCES\n\t$return = -13;\n message = sprintf(\"CVE-2017-18344 mitigation denied access to %s to %s(%d)\", file_name , execname(), pid());\n // print a warning message at KERN_INFO debug level\n printk(6, message);\n}\n\nprobe begin {\n printk(6, \"Mitigation for CVE-2017-18344 loaded.\\n\");\n}\n\n\nprobe end {\n printk(6, \"Mitigation for CVE-2017-18344 unloaded.\\n\");\n}\n\n\n---------\n\nFirst, the script places a probe at the return of the kernel function \u201cproc_timers_open\u201d when called. This modifies the return value to be EACCES which would return this value to userspace preventing this file from being opened. When the /proc/\u003cpid\u003e/timer file is attempted to be opened, a message will be logged to the kernel log subsystem showing the process and pid of the application attempting to access the timer file. \n\nThis file is not in widespread use at this time, although some applications may read from it to debug or understand their own timers that are set. This mitigation will not be useful in this context.\n\nFinally, the \u201cprobe begin\u201d and \u201cprobe end\u201d code blocks tell systemtap to add the supplied text to the kernel log buffer via the printk function. This creates an audit trail by registering in the system logs exactly when the mitigation is loaded and unloaded. This will need to be compiled with guru mode (-g parameter) to compile.\n\nThis will need to be loaded at each boot to remain effective. Red Hat Product security recommends updating to a patched kernel when it is available.\n\nRed Hat always seeks to provide both mitigations to disable attacks as well as the actual patches to treat the flaw. To learn more about SystemTap, and how it can be used in your management of your Red Hat systems, please refer to Using SystemTap[1] or one of our videos about it within our Customer Portal[2].\n\n1 - https://access.redhat.com/articles/17839\n2 - https://access.redhat.com/search/#/?q=systemtap",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
"version": "3.0"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c"
},
{
"acknowledgments": [
{
"names": [
"Juha-Matti Tilli"
],
"organization": "Aalto University - Department of Communications and Networking and Nokia Bell Labs"
}
],
"cve": "CVE-2018-5391",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2018-07-17T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1609664"
}
],
"notes": [
{
"category": "description",
"text": "A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/articles/3553061\n\nThis issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64, and Red Hat Enterprise Linux 7 for Power 9. Future kernel updates for the respective releases will address this issue.\n\nThis issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, but to a lesser degree. As such, the issue severity for RHEL5 is considered Moderate. This is not currently planned to be addressed in future updates of the product due to its life cycle and the issue severity. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.",
"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-2018-5391"
},
{
"category": "external",
"summary": "RHBZ#1609664",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1609664"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-5391",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-5391"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-5391",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5391"
},
{
"category": "external",
"summary": "https://access.redhat.com/articles/3553061",
"url": "https://access.redhat.com/articles/3553061"
},
{
"category": "external",
"summary": "https://www.kb.cert.org/vuls/id/641765",
"url": "https://www.kb.cert.org/vuls/id/641765"
}
],
"release_date": "2018-08-14T16:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2018:3590"
},
{
"category": "workaround",
"details": "One may change the default 4MB and 3MB values of net.ipv4.ipfrag_high_thresh and net.ipv4.ipfrag_low_thresh (and their ipv6 counterparts net.ipv6.ipfrag_high_thresh and net.ipv6.ipfrag_low_thresh) to 256 kB and 192 kB (respectively) or below. Tests show some to significant CPU saturation drop during an attack, depending on a hardware, configuration and environment.\n\nThere can be some impact on performance though, due to ipfrag_high_thresh of 262144 bytes, as only two 64K fragments can fit in the reassembly queue at the same time. For example, there is a risk of breaking applications that rely on large UDP packets.\n\nSee the Mitigation section in the https://access.redhat.com/articles/3553061 article for the script to quickly change to/from default and lower settings.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)"
},
{
"cve": "CVE-2018-10675",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2018-05-04T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1575065"
}
],
"notes": [
{
"category": "description",
"text": "The do_get_mempolicy() function in mm/mempolicy.c in the Linux kernel allows local users to hit a use-after-free bug via crafted system calls and thus cause a denial of service (DoS) or possibly have unspecified other impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact",
"title": "Vulnerability summary"
},
{
"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-2018-10675"
},
{
"category": "external",
"summary": "RHBZ#1575065",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1575065"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-10675",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-10675"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-10675",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-10675"
}
],
"release_date": "2017-08-19T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2018:3590"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact"
},
{
"acknowledgments": [
{
"names": [
"Qualys Research Labs"
]
}
],
"cve": "CVE-2018-14634",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
},
"discovery_date": "2018-08-31T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1624498"
}
],
"notes": [
{
"category": "description",
"text": "An integer overflow flaw was found in the Linux kernel\u0027s create_elf_tables() function. An unprivileged local user with access to SUID (or otherwise privileged) binary could use this flaw to escalate their privileges on the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Integer overflow in Linux\u0027s create_elf_tables function",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue does not affect 32-bit systems as they do not have a large enough address space to exploit this flaw.\n\nSystems with less than 32GB of memory are very unlikely to be affected by this issue due to memory demands during exploitation.\n\nThis issue does not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5.\n\nThis issue affects the version of the kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 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"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2018-14634"
},
{
"category": "external",
"summary": "RHBZ#1624498",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1624498"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2018-14634",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-14634"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-14634",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-14634"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/vulnerabilities/mutagen-astronomy",
"url": "https://access.redhat.com/security/vulnerabilities/mutagen-astronomy"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2018/09/25/4",
"url": "https://www.openwall.com/lists/oss-security/2018/09/25/4"
}
],
"release_date": "2018-09-25T17:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"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": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2018:3590"
},
{
"category": "workaround",
"details": "To mitigate the issue:\n\nEnable and install kernel-debuginfo packages as per https://access.redhat.com/solutions/666123\n\n1) On the host, save the following in a file with the \".stp\" extension:\n\n// CVE-2018-14634\n//\n// Theory of operations: adjust the thread\u0027s # rlimit-in-effect around\n// calls to the vulnerable get_arg_page() function so as to encompass\n// the newly required _STK_LIM / 4 * 3 maximum.\n\n// Complication: the rlimit is stored in a current-\u003e structure that\n// is shared across the threads of the process. They may concurrently\n// invoke this operation.\n\nfunction clamp_stack_rlim_cur:long ()\n%{\n struct rlimit *rlim = current-\u003esignal-\u003erlim;\n unsigned long rlim_cur = READ_ONCE(rlim[RLIMIT_STACK].rlim_cur);\n\n unsigned long limit = _STK_LIM / 4 * 3;\n limit *= 4; // multiply it back up, to the scale used by rlim_cur\n\n if (rlim_cur \u003e limit) {\n WRITE_ONCE(rlim[RLIMIT_STACK].rlim_cur, limit);\n STAP_RETURN(limit);\n } else\n STAP_RETURN(0);\n%}\n\nprobe kernel.function(\"copy_strings\").call\n{\n l = clamp_stack_rlim_cur()\n if (l)\n printf(\"lowered process %s(%d) STACK rlim_cur to %p\\n\",\n execname(), pid(), l)\n}\n\nprobe begin {\n\tprintf(\"CVE-2018-14634 mitigation loaded\\n\")\n\n}\n\nprobe end {\n\tprintf(\"CVE-2018-14634 mitigation unloaded\\n\")\n}\n\n2) Install the \"systemtap\" package and any required dependencies. Refer\nto the \"2. Using SystemTap\" chapter in the Red Hat Enterprise Linux\n\"SystemTap Beginners Guide\" document, available from docs.redhat.com,\nfor information on installing the required -debuginfo and matching kernel-devel packages\n\n3) Run the \"stap -g [filename-from-step-1].stp\" command as root.\n\nIf the host is rebooted, the changes will be lost and the script must be\nrun again.\n\n\nAlternatively, build the systemtap script on a development system with\n\"stap -g -p 4 [filename-from-step-1].stp\", distribute the resulting\nkernel module to all affected systems, and run \"staprun -L \u003cmodule\u003e\" on those.\nWhen using this approach only systemtap-runtime package is required on\nthe affected systems. Please notice that the kernel version must be the same\nacross all systems.\n\n\nThis may not be a suitable workaround if your application uses massive amounts of stack space. Please consider this if there are any adverse affects when running this mitigation.",
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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": "impact",
"details": "Important"
}
],
"title": "kernel: Integer overflow in Linux\u0027s create_elf_tables function"
}
]
}
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