rhsa-2012_1491
Vulnerability from csaf_redhat
Published
2012-12-04 19:43
Modified
2024-11-05 17:53
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Notes
Topic
Updated kernel-rt packages that fix several security issues and multiple
bugs are now available for Red Hat Enterprise MRG 2.2.
The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.
Details
The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.
This update fixes the following security issues:
* A flaw was found in the way Netlink messages without SCM_CREDENTIALS
(used for authentication) data set were handled. When not explicitly set,
the data was sent but with all values set to 0, including the process ID
and user ID, causing the Netlink message to appear as if it were sent with
root privileges. A local, unprivileged user could use this flaw to send
spoofed Netlink messages to an application, possibly resulting in the
application performing privileged operations if it relied on
SCM_CREDENTIALS data for the authentication of Netlink messages.
(CVE-2012-3520, Important)
* A race condition was found in the way asynchronous I/O and fallocate()
interacted when using the ext4 file system. A local, unprivileged user
could use this flaw to expose random data from an extent whose data blocks
have not yet been written, and thus contain data from a deleted file.
(CVE-2012-4508, Important)
* A use-after-free flaw was found in the Linux kernel's memory management
subsystem in the way quota handling for huge pages was performed. A local,
unprivileged user could use this flaw to cause a denial of service or,
potentially, escalate their privileges. (CVE-2012-2133, Moderate)
* A use-after-free flaw was found in the madvise() system call
implementation in the Linux kernel. A local, unprivileged user could use
this flaw to cause a denial of service or, potentially, escalate their
privileges. (CVE-2012-3511, Moderate)
* A divide-by-zero flaw was found in the TCP Illinois congestion control
algorithm implementation in the Linux kernel. If the TCP Illinois
congestion control algorithm were in use (the sysctl
net.ipv4.tcp_congestion_control variable set to "illinois"), a local,
unprivileged user could trigger this flaw and cause a denial of service.
(CVE-2012-4565, Moderate)
* An information leak flaw was found in the uname() system call
implementation in the Linux kernel. A local, unprivileged user could use
this flaw to leak kernel stack memory to user-space by setting the UNAME26
personality and then calling the uname() system call. (CVE-2012-0957, Low)
* Buffer overflow flaws were found in the udf_load_logicalvol() function in
the Universal Disk Format (UDF) file system implementation in the Linux
kernel. An attacker with physical access to a system could use these flaws
to cause a denial of service or escalate their privileges. (CVE-2012-3400,
Low)
* A flaw was found in the way the msg_namelen variable in the rds_recvmsg()
function of the Linux kernel's Reliable Datagram Sockets (RDS) protocol
implementation was initialized. A local, unprivileged user could use this
flaw to leak kernel stack memory to user-space. (CVE-2012-3430, Low)
Red Hat would like to thank Pablo Neira Ayuso for reporting CVE-2012-3520;
Theodore Ts'o for reporting CVE-2012-4508; Shachar Raindel for reporting
CVE-2012-2133; and Kees Cook for reporting CVE-2012-0957. Upstream
acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The
CVE-2012-4565 issue was discovered by Rodrigo Freire of Red Hat, and the
CVE-2012-3430 issue was discovered by the Red Hat InfiniBand team.
This update also fixes multiple bugs. Documentation for these changes will
be available shortly from the Technical Notes document linked to in the
References section.
Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.2.33-rt50, and correct these issues. The
system must be rebooted for this update to take effect.
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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"text": "The kernel-rt packages contain the Linux kernel, the core of any Linux\noperating system.\n\nThis update fixes the following security issues:\n\n* A flaw was found in the way Netlink messages without SCM_CREDENTIALS\n(used for authentication) data set were handled. When not explicitly set,\nthe data was sent but with all values set to 0, including the process ID\nand user ID, causing the Netlink message to appear as if it were sent with\nroot privileges. A local, unprivileged user could use this flaw to send\nspoofed Netlink messages to an application, possibly resulting in the\napplication performing privileged operations if it relied on\nSCM_CREDENTIALS data for the authentication of Netlink messages.\n(CVE-2012-3520, Important)\n\n* A race condition was found in the way asynchronous I/O and fallocate()\ninteracted when using the ext4 file system. A local, unprivileged user\ncould use this flaw to expose random data from an extent whose data blocks\nhave not yet been written, and thus contain data from a deleted file.\n(CVE-2012-4508, Important)\n\n* A use-after-free flaw was found in the Linux kernel\u0027s memory management\nsubsystem in the way quota handling for huge pages was performed. A local,\nunprivileged user could use this flaw to cause a denial of service or,\npotentially, escalate their privileges. (CVE-2012-2133, Moderate)\n\n* A use-after-free flaw was found in the madvise() system call\nimplementation in the Linux kernel. A local, unprivileged user could use\nthis flaw to cause a denial of service or, potentially, escalate their\nprivileges. (CVE-2012-3511, Moderate)\n\n* A divide-by-zero flaw was found in the TCP Illinois congestion control\nalgorithm implementation in the Linux kernel. If the TCP Illinois\ncongestion control algorithm were in use (the sysctl\nnet.ipv4.tcp_congestion_control variable set to \"illinois\"), a local,\nunprivileged user could trigger this flaw and cause a denial of service.\n(CVE-2012-4565, Moderate)\n\n* An information leak flaw was found in the uname() system call\nimplementation in the Linux kernel. A local, unprivileged user could use\nthis flaw to leak kernel stack memory to user-space by setting the UNAME26\npersonality and then calling the uname() system call. (CVE-2012-0957, Low)\n\n* Buffer overflow flaws were found in the udf_load_logicalvol() function in\nthe Universal Disk Format (UDF) file system implementation in the Linux\nkernel. An attacker with physical access to a system could use these flaws\nto cause a denial of service or escalate their privileges. (CVE-2012-3400,\nLow)\n\n* A flaw was found in the way the msg_namelen variable in the rds_recvmsg()\nfunction of the Linux kernel\u0027s Reliable Datagram Sockets (RDS) protocol\nimplementation was initialized. A local, unprivileged user could use this\nflaw to leak kernel stack memory to user-space. (CVE-2012-3430, Low)\n\nRed Hat would like to thank Pablo Neira Ayuso for reporting CVE-2012-3520;\nTheodore Ts\u0027o for reporting CVE-2012-4508; Shachar Raindel for reporting\nCVE-2012-2133; and Kees Cook for reporting CVE-2012-0957. Upstream\nacknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The\nCVE-2012-4565 issue was discovered by Rodrigo Freire of Red Hat, and the\nCVE-2012-3430 issue was discovered by the Red Hat InfiniBand team.\n\nThis update also fixes multiple bugs. Documentation for these changes will\nbe available shortly from the Technical Notes document linked to in the\nReferences section.\n\nUsers should upgrade to these updated packages, which upgrade the kernel-rt\nkernel to version kernel-rt-3.2.33-rt50, and correct these issues. The\nsystem must be rebooted for this update to take effect.",
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"details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/knowledge/articles/11258\n\nTo install kernel packages manually, use \"rpm -ivh [package]\". Do not\nuse \"rpm -Uvh\" as that will remove the running kernel binaries from\nyour system. You may use \"rpm -e\" to remove old kernels after\ndetermining that the new kernel functions properly on your system.",
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"url": "https://access.redhat.com/errata/RHSA-2012:1491"
}
],
"scores": [
{
"cvss_v2": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.9,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:L/Au:N/C:C/I:N/A:N",
"version": "2.0"
},
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{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: ext4: AIO vs fallocate stale data exposure"
},
{
"acknowledgments": [
{
"names": [
"Rodrigo Freire"
],
"organization": "Red Hat",
"summary": "This issue was discovered by Red Hat."
}
],
"cve": "CVE-2012-4565",
"discovery_date": "2012-10-15T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "871848"
}
],
"notes": [
{
"category": "description",
"text": "The tcp_illinois_info function in net/ipv4/tcp_illinois.c in the Linux kernel before 3.4.19, when the net.ipv4.tcp_congestion_control illinois setting is enabled, allows local users to cause a denial of service (divide-by-zero error and OOPS) by reading TCP stats.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: net: divide by zero in tcp algorithm illinois",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 5.\n\nThis issue did affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 6.\n\nThis issue did affect the version of Linux kernel as shipped with Red Hat Enterprise MRG 2.",
"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": [
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"summary": "Canonical URL",
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},
{
"category": "external",
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},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2012-4565",
"url": "https://www.cve.org/CVERecord?id=CVE-2012-4565"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2012-4565",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2012-4565"
}
],
"release_date": "2012-10-31T00:00:00+00:00",
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{
"category": "vendor_fix",
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}
],
"title": "kernel: net: divide by zero in tcp algorithm illinois"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- 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.