rhsa-2021_3814
Vulnerability from csaf_redhat
Published
2021-10-12 15:14
Modified
2024-09-16 06:09
Summary
Red Hat Security Advisory: kpatch-patch security update
Notes
Topic
An update is now available for Red Hat Enterprise Linux 7.6 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
This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.
Security Fix(es):
* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
* kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
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.
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": "Incorrect Authorization"
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"category": "description",
"text": "A flaw was found in the Linux kernel\u2019s KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Both Red Hat Enterprise Linux 7 and Red Hat Enterprise Linux 8 leverage udev to set the proper permissions (ugo=rw) of the `/dev/kvm` device, making it accessible to all users. It is worth noting that while the KVM rule is part of the main udev package in Red Hat Enterprise Linux 8, the same rule is shipped with the `qemu-kvm` package in Red Hat Enterprise Linux 7. In other words, Red Hat Enterprise Linux 7 does not expose `/dev/kvm` to unprivileged users by default, as long as the `qemu-kvm` package is not installed.",
"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-2021-22543"
},
{
"category": "external",
"summary": "RHBZ#1965461",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1965461"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-22543",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-22543"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-22543",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22543"
},
{
"category": "external",
"summary": "https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584",
"url": "https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584"
}
],
"release_date": "2021-05-18T00:00:00+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",
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"url": "https://access.redhat.com/errata/RHSA-2021:3814"
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"title": "kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks"
},
{
"cve": "CVE-2021-22555",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2021-07-07T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1980101"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was discovered in processing setsockopt IPT_SO_SET_REPLACE (or IP6T_SO_SET_REPLACE) for 32 bit processes on 64 bit systems. This flaw will allow local user to gain privileges or cause a DoS through user name space. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "For the Red Hat Enterprise Linux 7 only privileged user can trigger this bug.\nFor the Red Hat Enterprise Linux 8 regular user can trigger it, and the result is corruption of 4 bytes of memory.",
"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-2021-22555"
},
{
"category": "external",
"summary": "RHBZ#1980101",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1980101"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-22555",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-22555"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22555"
},
{
"category": "external",
"summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d"
},
{
"category": "external",
"summary": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528",
"url": "https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528"
}
],
"release_date": "2021-07-07T00:00:00+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",
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"title": "kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c"
},
{
"cve": "CVE-2021-37576",
"cwe": {
"id": "CWE-119",
"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
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"discovery_date": "2021-06-26T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1986506"
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"notes": [
{
"category": "description",
"text": "A flaw was found on the Linux kernel. On the PowerPC platform, the KVM guest allows the OS users to cause host OS memory corruption via rtas_args.nargs. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: powerpc: KVM guest OS users can cause host OS memory corruption",
"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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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-37576"
},
{
"category": "external",
"summary": "RHBZ#1986506",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1986506"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-37576",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-37576"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-37576",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-37576"
},
{
"category": "external",
"summary": "https://www.openwall.com/lists/oss-security/2021/07/26/1",
"url": "https://www.openwall.com/lists/oss-security/2021/07/26/1"
}
],
"release_date": "2021-07-23T00:00:00+00:00",
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{
"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",
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},
"url": "https://access.redhat.com/errata/RHSA-2021:3814"
},
{
"category": "workaround",
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"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: powerpc: KVM guest OS users can cause host OS memory corruption"
}
]
}
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