drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Mehrere Probleme in GRUB
Name: |
Mehrere Probleme in GRUB |
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ID: |
USN-4992-1 |
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Distribution: |
Ubuntu |
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Plattformen: |
Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10 |
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Datum: |
Fr, 18. Juni 2021, 06:31 |
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Referenzen: |
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25632
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20225
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27749
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20233
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27779
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14372 |
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Applikationen: |
GRUB |
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Originalnachricht |
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========================================================================== Ubuntu Security Notice USN-4992-1 June 18, 2021
grub2-signed, grub2-unsigned vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in GRUB 2.
Software Description: - grub2-signed: GRand Unified Bootloader - grub2-unsigned: GRand Unified Bootloader
Details:
Máté Kukri discovered that the acpi command in GRUB 2 allowed privileged users to load crafted ACPI tables when secure boot is enabled. An attacker could use this to bypass UEFI Secure Boot restrictions. (CVE-2020-14372)
Chris Coulson discovered that the rmmod command in GRUB 2 contained a use- after-free vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-25632)
Chris Coulson discovered that a buffer overflow existed in the command line parser in GRUB 2. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-27749)
It was discovered that the cutmem command in GRUB 2 did not honor secure boot locking. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-27779)
It was discovered that the option parser in GRUB 2 contained a heap overflow vulnerability. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20225)
It was discovered that the menu rendering implementation in GRUB 2 did not properly calculate the amount of memory needed in some situations, leading to out-of-bounds writes. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2021-20233)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: grub-efi-amd64-bin 2.04-1ubuntu44.2 grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 grub-efi-arm64-bin 2.04-1ubuntu44.2 grub-efi-arm64-signed 1.167.2+2.04-1ubuntu44.2
Ubuntu 20.04 LTS: grub-efi-amd64-bin 2.04-1ubuntu44.2 grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 grub-efi-arm64-bin 2.04-1ubuntu44.2 grub-efi-arm64-signed 1.167.2+2.04-1ubuntu44.2
Ubuntu 18.04 LTS: grub-efi-amd64-bin 2.04-1ubuntu44.1.2 grub-efi-amd64-signed 1.167~18.04.5+2.04-1ubuntu44.1.2 grub-efi-arm64-bin 2.04-1ubuntu44.1.2 grub-efi-arm64-signed 1.167~18.04.5+2.04-1ubuntu44.1.2
After a standard system update you need to reboot your computer to make all the necessary changes.
References: https://ubuntu.com/security/notices/USN-4992-1 CVE-2020-14372, CVE-2020-25632, CVE-2020-27749, CVE-2020-27779, CVE-2021-20225, CVE-2021-20233, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass2021
Package Information: https://launchpad.net/ubuntu/+source/grub2-signed/1.167.2 https://launchpad.net/ubuntu/+source/grub2-unsigned/2.04-1ubuntu44.2 https://launchpad.net/ubuntu/+source/grub2-signed/1.167.2 https://launchpad.net/ubuntu/+source/grub2-unsigned/2.04-1ubuntu44.2 https://launchpad.net/ubuntu/+source/grub2-signed/1.167~18.04.5 https://launchpad.net/ubuntu/+source/grub2-unsigned/2.04-1ubuntu44.1.2
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