Jesse Michael and Mickey Shkatov discovered that the configuration parser
in GRUB2 did not properly exit when errors were discovered, resulting in
heap-based buffer overflows. A local attacker could use this to execute
arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-10713)
Chris Coulson discovered that the GRUB2 function handling code did not
properly handle a function being redefined, leading to a use-after-free
vulnerability. A local attacker could use this to execute arbitrary code
and bypass UEFI Secure Boot restrictions. (CVE-2020-15706)
Chris Coulson discovered that multiple integer overflows existed in GRUB2
when handling certain filesystems or font files, leading to heap-based
buffer overflows. A local attacker could use these to execute arbitrary
code and bypass UEFI Secure Boot restrictions. (CVE-2020-14309,
CVE-2020-14310, CVE-2020-14311)
It was discovered that the memory allocator for GRUB2 did not validate
allocation size, resulting in multiple integer overflows and heap-based
buffer overflows when handling certain filesystems, PNG images or disk
metadata. A local attacker could use this to execute arbitrary code and
bypass UEFI Secure Boot restrictions. (CVE-2020-14308)
Mathieu Trudel-Lapierre discovered that in certain situations, GRUB2
failed to validate kernel signatures. A local attacker could use this
to bypass Secure Boot restrictions. (CVE-2020-15705)
Colin Watson and Chris Coulson discovered that an integer overflow
existed in GRUB2 when handling the initrd command, leading to a heap-based
buffer overflow. A local attacker could use this to execute arbitrary code
and bypass UEFI Secure Boot restrictions. (CVE-2020-15707)
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Ubuntu | 20.04 | noarch | grub-efi-amd64-bin | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-common | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-common-dbgsym | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-coreboot | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-coreboot-bin | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-coreboot-dbg | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-efi | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-efi-amd64 | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-efi-amd64-dbg | < 2.04-1ubuntu26.1 | UNKNOWN |
Ubuntu | 20.04 | noarch | grub-efi-amd64-signed-template | < 2.04-1ubuntu26.1 | UNKNOWN |
ubuntu.com/security/CVE-2020-10713
ubuntu.com/security/CVE-2020-14308
ubuntu.com/security/CVE-2020-14309
ubuntu.com/security/CVE-2020-14310
ubuntu.com/security/CVE-2020-14311
ubuntu.com/security/CVE-2020-15705
ubuntu.com/security/CVE-2020-15706
ubuntu.com/security/CVE-2020-15707
wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass