CVE-2019-11811: Use After Free

Published May 7, 2019
·
Updated

A flaw was found in the Linux kernel's implementation of IPMI (remote baseband access). An attacker, with local access to read /proc/ioports, may be able to create a use-after-free condition when the kernel module is unloaded which may result in privilege escalation.

Other sources

A flaw was found in the Linux kernels implementation of IPMI (remote baseband access) where an attacker with local access to read /proc/ioports may be able to create a use-after-free condition when the kernel module is unloaded. The use after-free condition may result in privilege escalation. Investigation is ongoing.

Upstream Patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=401e7e88d4ef80188ffa07095ac00456f901b8c4

— Red Hat

An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmisi module is removed, related to drivers/char/ipmi/ipmisiintf.c, drivers/char/ipmi/ipmisimemio.c, and drivers/char/ipmi/ipmisiportio.c.

Affected Software

23 affected componentsFixes available
redhat/kernel-rt<0:3.10.0-957.27.2.rt56.940.el7
0:3.10.0-957.27.2.rt56.940.el7
redhat/kernel<0:3.10.0-957.27.2.el7
0:3.10.0-957.27.2.el7
redhat/kernel-alt<0:4.14.0-115.26.1.el7a
0:4.14.0-115.26.1.el7a
redhat/kernel<0:3.10.0-693.61.1.el7
0:3.10.0-693.61.1.el7
redhat/kernel<0:3.10.0-862.46.1.el7
0:3.10.0-862.46.1.el7
redhat/kernel-rt<0:4.18.0-80.7.1.rt9.153.el8_0
0:4.18.0-80.7.1.rt9.153.el8_0
redhat/kernel<0:4.18.0-80.7.1.el8_0
0:4.18.0-80.7.1.el8_0
redhat/kernel-rt<1:3.10.0-693.61.1.rt56.656.el6
1:3.10.0-693.61.1.rt56.656.el6
Linux Linux kernel>=4.18<4.19.31
Linux Linux kernel>=4.20<5.0.4
openSUSE Leap=15.1
redhat Enterprise Linux=7.0
redhat Enterprise Linux Aus=7.6
redhat Enterprise Linux Desktop=7.0
redhat Enterprise Linux Server=7.0
redhat Enterprise Linux Server Aus=7.4
redhat Enterprise Linux Server Tus=7.4
redhat Enterprise Linux Server Tus=7.6
redhat Enterprise Linux Workstation=7.0
ubuntu/linux*
ubuntu/linux-azure*
ubuntu/linux-lts-xenial*
ubuntu/linux-hwe<5.0.0-23.24~18.04.1
5.0.0-23.24~18.04.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.27.2.rt56.940.el7
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.27.2.el7
  3. Upgrade

    Upgrade redhat/kernel-alt to a version that resolves this vulnerability.

    Fixed in 0:4.14.0-115.26.1.el7a
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-693.61.1.el7
  5. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-862.46.1.el7
  6. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.7.1.rt9.153.el8_0
  7. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.7.1.el8_0
  8. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 1:3.10.0-693.61.1.rt56.656.el6
  9. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 5.0.0-23.24~18.04.1
  10. Configuration

    Blacklist the "ipmi_si" kernel module to prevent it from being loaded.

    Linux kernel IPMI ipmi_si module blacklist = blacklisted
  11. Operational

    Unload the loaded "ipmi_si" kernel module.

Event History

May 7, 2019
CVE Published
12:00 AM
CVE Published
via MITRE·01:24 PM
Data Sourced
via MITRE·01:24 PM
Description
Data Sourced
via OSV·02:29 PM
DescriptionSeverityAffected Software
May 13, 2019
Data Sourced
via Red Hat·07:09 AM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is CVE-2019-11811?

CVE-2019-11811 is a vulnerability in the Linux kernel that allows a use-after-free attack when attempting to read /proc/ioports after the ipmi_si module is removed.

2

What is the severity of CVE-2019-11811?

CVE-2019-11811 has a severity level of high.

3

Which software versions are affected by CVE-2019-11811?

The affected software versions include kernel-rt 3.10.0-957.27.2.rt56.940.el7, kernel 3.10.0-957.27.2.el7, kernel-alt 4.14.0-115.26.1.el7a, and more.

4

How can I fix CVE-2019-11811?

To fix CVE-2019-11811, users should update their Linux kernel to a version that includes the necessary patch.

5

Where can I find more information about CVE-2019-11811?

More information about CVE-2019-11811 can be found on the CVE and NVD websites, as well as Red Hat's Bugzilla and Errata pages.

Company

Resources

Contact

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