rhsa-2022_5636
Vulnerability from csaf_redhat
Published
2022-07-19 15:31
Modified
2024-11-06 01:13
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 8.1 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):
* kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak (CVE-2022-1012)
* kernel: race condition in perf_event_open leads to privilege escalation (CVE-2022-1729)
* kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root (CVE-2022-32250)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* Backport request of "genirq: use rcu in kstat_irqs_usr()" (BZ#2083311)
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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"acknowledgments": [
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"names": [
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"organization": "Hebrew University"
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"cve": "CVE-2022-1012",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
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"system_name": "Red Hat Bugzilla ID",
"text": "2064604"
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{
"category": "description",
"text": "The Linux kernel\u0027s TCP source port generation algorithm in the TCP stack contains a flaw due to the small table perturb size. This flaw allows an attacker to positively distinguish a system among devices with identical hardware and software, which lasts until the device restarts.\r\n\r\nAn attacker can guess the evolution of the internal state used for source port generation. This information is used to infer the TCP traffic patterns of the victim, guessing the number of outgoing TCP connections established in a specific time frame, which can lead to a system fingerprinting.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat Enterprise Linux version 7 (RHEL7) is not affected by this issue. While RHEL7 implements the TCP port randomization algorithm 3 (the Simple Hash-Based Port Selection Algorithm), which knowingly has shortcomings (as per RFC 6056, item 3.3.3), the object of study of this flaw was the TCP port selector algorithm 4, the Double-Hash Port Selection Algorithm, which is not existent in RHEL7.\n\nThis flaw is ranked as a Moderate impact due to:\n* Limited exposure of the data in the TCP stack;\n* The impact of this vulnerability is limited to a system fingerprinting;\n* The requirements to carry the attack are elevated, requiring monitoring of the data flow.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2022-1012"
},
{
"category": "external",
"summary": "RHBZ#2064604",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2064604"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-1012",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-1012"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-1012",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-1012"
},
{
"category": "external",
"summary": "https://arxiv.org/abs/2209.12993",
"url": "https://arxiv.org/abs/2209.12993"
},
{
"category": "external",
"summary": "https://datatracker.ietf.org/doc/html/rfc6056#section-3.3.4",
"url": "https://datatracker.ietf.org/doc/html/rfc6056#section-3.3.4"
},
{
"category": "external",
"summary": "https://lore.kernel.org/lkml/20220428124001.7428-1-w@1wt.eu/",
"url": "https://lore.kernel.org/lkml/20220428124001.7428-1-w@1wt.eu/"
},
{
"category": "external",
"summary": "https://lwn.net/Articles/910435/",
"url": "https://lwn.net/Articles/910435/"
}
],
"release_date": "2022-05-02T04:30:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2022-07-19T15:31:52+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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"url": "https://access.redhat.com/errata/RHSA-2022:5636"
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
"version": "3.1"
},
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"category": "impact",
"details": "Moderate"
}
],
"title": "kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak"
},
{
"acknowledgments": [
{
"names": [
"Norbert Slusarek"
]
}
],
"cve": "CVE-2022-1729",
"cwe": {
"id": "CWE-366",
"name": "Race Condition within a Thread"
},
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"text": "2086753"
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"notes": [
{
"category": "description",
"text": "A use-after-free flaw was found in the Linux kernel\u2019s performance events functionality. A user triggers a race condition in setting up performance monitoring between the leading PERF_TYPE_TRACEPOINT and sub PERF_EVENT_HARDWARE plus the PERF_EVENT_SOFTWARE using the perf_event_open() function with these three types. This flaw allows a local user to crash the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: race condition in perf_event_open leads to privilege escalation",
"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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{
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{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-1729",
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{
"category": "vendor_fix",
"date": "2022-07-19T15:31:52+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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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "kernel: race condition in perf_event_open leads to privilege escalation"
},
{
"cve": "CVE-2022-32250",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
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"system_name": "Red Hat Bugzilla ID",
"text": "2092427"
}
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"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in the Linux kernel\u0027s Netfilter subsystem in net/netfilter/nf_tables_api.c. This flaw allows a local attacker with user access to cause a privilege escalation issue.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The latest kernel in RHCOS is kernel-4.18.0-305.49.1.el8 which does not contain the vulnerable code and is not affected, also OCP v4.9 or earlier are not affected.",
"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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"url": "https://access.redhat.com/security/cve/CVE-2022-32250"
},
{
"category": "external",
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2022-32250"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-32250",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-32250"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/net/netfilter?id=520778042ccca019f3ffa136dd0ca565c486cedd",
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},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2022/05/31/1",
"url": "https://www.openwall.com/lists/oss-security/2022/05/31/1"
}
],
"release_date": "2022-05-31T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-07-19T15:31:52+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": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2022:5636"
},
{
"category": "workaround",
"details": "In order to trigger the issue, it requires the ability to create user/net namespaces.\n\nOn non-containerized deployments of Red Hat Enterprise Linux 8, you can disable user namespaces by setting user.max_user_namespaces to 0:\n\n# echo \"user.max_user_namespaces=0\" \u003e /etc/sysctl.d/userns.conf\n# sysctl -p /etc/sysctl.d/userns.conf\n\nOn containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled.",
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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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root"
}
]
}
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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.