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RedHat: RHSA-2019-2945-01 Important: Kpatch-Patch Remote DoS Risk

red hat
Calendar Grey October 1, 2019
Dist Redhat Esm H88
A critical security kpatch-patch release resolves remote service disruption and heap corruption vulnerabilities affecting Red Hat Enterprise Linux.
An update for kpatch-patch is now available for Red Hat Enterprise Linux 7

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Summary

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):
* If the Wake-up on Wireless LAN functionality is configured in the brcmfmac driver, which only works with Broadcom FullMAC chipsets, a malicious event frame can be constructed to trigger a heap buffer overflow in the brcmf_wowl_nd_results() function. This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw (CVE-2019-9503), can be used remotely. This can result in a remote denial of service (DoS). Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out. (CVE-2019-9500)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgements, and other related information, refer to the CVE page(s) listed in the References section.

Topics%20covered

Topics Covered

security advisory kernel patch important heap overflow red hat enterprise remote doS brcmfmac driver

References

https://access.redhat.com/security/cve/CVE-2019-9500 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Server (v. 7):
Source: kpatch-patch-3_10_0-1062-1-2.el7.src.rpm
ppc64le: kpatch-patch-3_10_0-1062-1-2.el7.ppc64le.rpm kpatch-patch-3_10_0-1062-debuginfo-1-2.el7.ppc64le.rpm
x86_64: kpatch-patch-3_10_0-1062-1-2.el7.x86_64.rpm kpatch-patch-3_10_0-1062-debuginfo-1-2.el7.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


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2019:2945-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2945
Issue date: 2019-10-01

Topic

An update for kpatch-patch is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory kernel patch important heap overflow red hat enterprise remote doS brcmfmac driver

Relevant Releases Architectures

Red Hat Enterprise Linux Server (v. 7) - ppc64le, x86_64

Bugs Fixed

1701224 - CVE-2019-9500 kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results

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