RedHat: RHSA-2020-3898:01 Moderate: cloud-init security, bug fix,
Summary
The cloud-init packages provide a set of init scripts for cloud instances.
Cloud instances need special scripts to run during initialization to
retrieve and install SSH keys, and to let the user run various scripts.
The following packages have been upgraded to a later upstream version:
cloud-init (19.4). (BZ#1803094)
Security Fix(es):
* cloud-init: Use of random.choice when generating random password
(CVE-2020-8631)
* cloud-init: Too short random password length in cc_set_password in
config/cc_set_passwords.py (CVE-2020-8632)
* cloud-init: default configuration disabled deletion of SSH host keys
(CVE-2018-10896)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.9 Release Notes linked from the References section.
Summary
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
References
https://access.redhat.com/security/cve/CVE-2018-10896 https://access.redhat.com/security/cve/CVE-2020-8631 https://access.redhat.com/security/cve/CVE-2020-8632 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index
Package List
Red Hat Enterprise Linux Server (v. 7):
Source:
cloud-init-19.4-7.el7.src.rpm
ppc64:
cloud-init-19.4-7.el7.ppc64.rpm
ppc64le:
cloud-init-19.4-7.el7.ppc64le.rpm
s390x:
cloud-init-19.4-7.el7.s390x.rpm
x86_64:
cloud-init-19.4-7.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/
Topic
An update for cloud-init is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64
Bugs Fixed
1574338 - CVE-2018-10896 cloud-init: default configuration disabled deletion of SSH host keys [rhel-7]
1598831 - CVE-2018-10896 cloud-init: default configuration disabled deletion of SSH host keys
1748015 - [cloud-init][RHEL7] /etc/resolv.conf lose config after reboot (initial instance is ok)
1772505 - [RHEL7] swapon fails with "swapfile has holes" when created on a xfs filesystem by cloud-init
1793652 - Support for AWS IMDS v2 (available in cloud-init 19.4)
1798728 - CVE-2020-8632 cloud-init: Too short random password length in cc_set_password in config/cc_set_passwords.py
1798731 - CVE-2020-8631 cloud-init: Use of random.choice when generating random password
1803094 - [RHEL-7.9] cloud-init rebase to 19.4
1821679 - [cloud-init test] Cloud-init rebase to 19.4 testing in rhel-7.9
1821999 - [RHEL7.9] Do not log IMDSv2 token values into cloud-init.log
