CVE-2018-19854: Infoleak

Published Nov 3, 2018
·
Updated

An issue was discovered in the Linux kernel before 4.19.3. cryptoreportone() and related functions in crypto/cryptouser.c (the crypto user configuration API) do not fully initialize structures that are copied to userspace, potentially leaking sensitive memory to user programs. NOTE: this is a CVE-2013-2547 regression but with easier exploitability because the attacker does not need a capability (however, the system must have the CONFIGCRYPTOUSER kconfig option).

Other sources

An issue was discovered in the Linux kernel in the cryptoreportone() and related functions in the crypto/cryptouser.c (the crypto user configuration API) which do not fully initialize structures that are copied to userspace, potentially leaking sensitive kernel memory content to a userspace.

Affected Software

9 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-147.rt24.93.el8
0:4.18.0-147.rt24.93.el8
redhat/kernel<0:4.18.0-147.el8
0:4.18.0-147.el8
redhat/kernel<4.19.3
4.19.3
Linux Linux kernel<4.19.3
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
debian/linux
6.1.176-16.1.190-16.12.107-16.12.113-17.2.12-1

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 0:4.18.0-147.rt24.93.el8
  2. Upgrade

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

    Fixed in 0:4.18.0-147.el8
  3. Upgrade

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

    Fixed in 4.19.3
  4. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.113-1Fixed in 7.2.12-1
  5. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.19.3

Event History

Nov 3, 2018
CVE Published
12:00 AM
Dec 4, 2018
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·04:00 PM
Data Sourced
via MITRE·04:00 PM
Description
Data Sourced
via NVD·04:29 PM
RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2018-19854?

CVE-2018-19854 has a medium severity rating due to potential information leakage in the Linux kernel.

2

How do I fix CVE-2018-19854?

To fix CVE-2018-19854, update to kernel version 4.19.3 or later for affected Linux distributions.

3

Which versions of the Linux kernel are affected by CVE-2018-19854?

CVE-2018-19854 affects the Linux kernel versions earlier than 4.19.3.

4

What type of leak is caused by CVE-2018-19854?

CVE-2018-19854 can lead to sensitive memory being leaked to user programs through uninitialized structures.

5

What software packages are affected by CVE-2018-19854?

CVE-2018-19854 affects various Linux kernel packages including those in Red Hat and Ubuntu distributions.

Company

Resources

Contact

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