rhsa-2018_2933
Vulnerability from csaf_redhat
Published
2018-10-16 18:56
Modified
2024-11-05 20:47
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 6.5 Advanced 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 named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)
* 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: 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-2018-5390 and CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.
Bug Fix(es):
* Previously, invalid headers in the sk_buff struct led to an indefinite loop in the tcp_collapse() function. As a consequence, the system became unresponsive. This update backports the upstream changes that remove the problematic code in tcp_collapse(). As a result, the system no longer hangs in the described scenario. (BZ#1619630)
* After updating the system to prevent the L1 Terminal Fault (L1TF) vulnerability, only one thread was detected on systems that offer processing of two threads on a single processor core. With this update, the "__max_smt_threads()" function has been fixed. As a result, both threads are now detected correctly in the described situation. (BZ#1625333)
* 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#1629632)
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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"title": "Vulnerability description"
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"text": "kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)",
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"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.",
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{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)"
},
{
"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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"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"
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{
"category": "external",
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{
"category": "vendor_fix",
"date": "2018-10-16T18:56:07+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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},
{
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"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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{
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"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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},
{
"category": "general",
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"title": "Vulnerability description"
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{
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"text": "kernel: Integer overflow in Linux\u0027s create_elf_tables function",
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{
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{
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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2018:2933"
},
{
"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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- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.