RedHat: RHSA-2021-1734:01 Moderate: shim security update
Summary
The shim package contains a first-stage UEFI boot loader that handles
chaining to a trusted full boot loader under secure boot environments.
Security Fix(es):
* grub2: acpi command allows privileged user to load crafted ACPI tables
when Secure Boot is enabled (CVE-2020-14372)
* grub2: Use-after-free in rmmod command (CVE-2020-25632)
* grub2: Out-of-bounds write in grub_usb_device_initialize()
(CVE-2020-25647)
* grub2: Stack buffer overflow in grub_parser_split_cmdline()
(CVE-2020-27749)
* grub2: cutmem command allows privileged user to remove memory regions
when Secure Boot is enabled (CVE-2020-27779)
* grub2: Heap out-of-bounds write in short form option parser
(CVE-2021-20225)
* grub2: Heap out-of-bounds write due to miscalculation of space required
for quoting (CVE-2021-20233)
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 8.4 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-2020-14372 https://access.redhat.com/security/cve/CVE-2020-25632 https://access.redhat.com/security/cve/CVE-2020-25647 https://access.redhat.com/security/cve/CVE-2020-27749 https://access.redhat.com/security/cve/CVE-2020-27779 https://access.redhat.com/security/cve/CVE-2021-20225 https://access.redhat.com/security/cve/CVE-2021-20233 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/security/vulnerabilities/RHSB-2021-003 https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/
Package List
Red Hat Enterprise Linux BaseOS (v. 8):
Source:
shim-15.4-2.el8_1.src.rpm
aarch64:
shim-aa64-15.4-2.el8_1.aarch64.rpm
x86_64:
shim-ia32-15.4-2.el8_1.x86_64.rpm
shim-x64-15.4-2.el8_1.x86_64.rpm
Red Hat CodeReady Linux Builder (v. 8):
Source:
shim-unsigned-aarch64-15-7.el8_1.src.rpm
shim-unsigned-x64-15.4-4.el8_1.src.rpm
aarch64:
shim-unsigned-aarch64-15-7.el8_1.aarch64.rpm
x86_64:
shim-unsigned-x64-15.4-4.el8_1.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 shim, shim-unsigned-aarch64, and shim-unsigned-x64 is nowavailable for Red Hat Enterprise Linux 8.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 CodeReady Linux Builder (v. 8) - aarch64, x86_64
Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, x86_64
Bugs Fixed
1873150 - CVE-2020-14372 grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled
1879577 - CVE-2020-25632 grub2: Use-after-free in rmmod command
1886936 - CVE-2020-25647 grub2: Out-of-bounds write in grub_usb_device_initialize()
1899966 - CVE-2020-27749 grub2: Stack buffer overflow in grub_parser_split_cmdline()
1900698 - CVE-2020-27779 grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled
1924696 - CVE-2021-20225 grub2: Heap out-of-bounds write in short form option parser
1926263 - CVE-2021-20233 grub2: Heap out-of-bounds write due to miscalculation of space required for quoting
