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Ubuntu - GRUB 2 vulnerabilities (2020-07-29)

来源:Ubuntu官网 发布日期:2020-07-29 阅读次数:1694 评论:0

基本信息

发布日期:2020-07-29(官方当地时间)

更新类型:安全更新

更新版本:未知

感知时间:2020-07-30 03:41:21

风险等级:未知

情报贡献:TSRC

更新标题

USN-4432-1: GRUB 2 vulnerabilities

更新详情

grub2, grub2-signed vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 20.04 LTS
Ubuntu 18.04 LTS
Ubuntu 16.04 LTS
Ubuntu 14.04 ESM
Summary
Several security issues were fixed in GRUB 2.
Software Description
grub2 - GRand Unified Bootloader
grub2-signed - GRand Unified Bootloader
Details
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)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS
grub-efi-amd64-bin - 2.04-1ubuntu26.1
grub-efi-amd64-signed - 1.142.3+2.04-1ubuntu26.1
grub-efi-arm-bin - 2.04-1ubuntu26.1
grub-efi-arm64-bin - 2.04-1ubuntu26.1
grub-efi-arm64-signed - 1.142.3+2.04-1ubuntu26.1
grub-efi-ia32-bin - 2.04-1ubuntu26.1
Ubuntu 18.04 LTS
grub-efi-amd64-bin - 2.02-2ubuntu8.16
grub-efi-amd64-signed - 1.93.18+2.02-2ubuntu8.16
grub-efi-arm-bin - 2.02-2ubuntu8.16
grub-efi-arm64-bin - 2.02-2ubuntu8.16
grub-efi-arm64-signed - 1.93.18+2.02-2ubuntu8.16
grub-efi-ia32-bin - 2.02-2ubuntu8.16
grub-efi-ia64-bin - 2.02-2ubuntu8.16
Ubuntu 16.04 LTS
grub-efi-amd64-bin - 2.02~beta2-36ubuntu3.26
grub-efi-amd64-signed - 1.66.26+2.02~beta2-36ubuntu3.26
grub-efi-arm-bin - 2.02~beta2-36ubuntu3.26
grub-efi-arm64-bin - 2.02~beta2-36ubuntu3.26
grub-efi-arm64-signed - 1.66.26+2.02~beta2-36ubuntu3.26
grub-efi-ia32-bin - 2.02~beta2-36ubuntu3.26
grub-efi-ia64-bin - 2.02~beta2-36ubuntu3.26
Ubuntu 14.04 ESM
grub-efi-amd64-bin - 2.02~beta2-9ubuntu1.20
grub-efi-amd64-signed - 1.34.22+2.02~beta2-9ubuntu1.20
grub-efi-arm-bin - 2.02~beta2-9ubuntu1.20
grub-efi-arm64-bin - 2.02~beta2-9ubuntu1.20
grub-efi-ia32-bin - 2.02~beta2-9ubuntu1.20
grub-efi-ia64-bin - 2.02~beta2-9ubuntu1.20
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
Fully mitigating these vulnerabilities requires both an updated GRUB2 boot loader and the application of a UEFI Revocation List (dbx) to system firmware. Ubuntu will provide a packaged dbx update at a later time, though system adminstrators may choose to apply a third party dbx update before then. For more details on mitigation steps and the risks entailed (especially for dual/multi-boot scenarios), please see the Knowledge Base article at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
References
CVE-2020-10713
CVE-2020-14308
CVE-2020-14309
CVE-2020-14310
CVE-2020-14311
CVE-2020-15705
CVE-2020-15706
CVE-2020-15707
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
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