drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Mehrere Probleme in Linux
Name: |
Mehrere Probleme in Linux |
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ID: |
RHSA-2018:2791-01 |
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Distribution: |
Red Hat |
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Plattformen: |
Red Hat Enterprise Linux |
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Datum: |
Di, 25. September 2018, 23:16 |
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Referenzen: |
https://access.redhat.com/security/cve/CVE-2018-5391
https://access.redhat.com/security/cve/CVE-2018-5390
https://access.redhat.com/security/cve/CVE-2018-10675 |
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Applikationen: |
Linux |
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Originalnachricht |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2791-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2791 Issue date: 2018-09-25 CVE Names: CVE-2018-5390 CVE-2018-5391 CVE-2018-10675 =====================================================================
1. Summary:
An update for kernel is now available for Red Hat Enterprise Linux 6.4 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.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Server AUS (v. 6.4) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64
3. Description:
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)
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.
Bug Fix(es):
* 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#1625330)
4. Solution:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack) 1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)
6. Package List:
Red Hat Enterprise Linux Server AUS (v. 6.4):
Source: kernel-2.6.32-358.93.1.el6.src.rpm
noarch: kernel-doc-2.6.32-358.93.1.el6.noarch.rpm kernel-firmware-2.6.32-358.93.1.el6.noarch.rpm
x86_64: kernel-2.6.32-358.93.1.el6.x86_64.rpm kernel-debug-2.6.32-358.93.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.93.1.el6.x86_64.rpm kernel-devel-2.6.32-358.93.1.el6.x86_64.rpm kernel-headers-2.6.32-358.93.1.el6.x86_64.rpm perf-2.6.32-358.93.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 6.4):
Source: kernel-2.6.32-358.93.1.el6.src.rpm
x86_64: kernel-debug-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.93.1.el6.x86_64.rpm perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm python-perf-2.6.32-358.93.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2018-5390 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/cve/CVE-2018-10675 https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/
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