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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0748 grub2 security update 3 March 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: grub2 Publisher: Debian Operating System: Debian GNU/Linux UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Existing Account Unauthorised Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-20233 CVE-2021-20225 CVE-2020-27779 CVE-2020-27749 CVE-2020-25647 CVE-2020-25632 CVE-2020-14372 Original Bulletin: https://lists.debian.org/debian-security-announce/2021/msg00048.html Comment: This advisory references vulnerabilities in products which run on platforms other than Debian. It is recommended that administrators running grub2 check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - - ------------------------------------------------------------------------- Debian Security Advisory DSA-4867-1 security@debian.org https://www.debian.org/security/ Salvatore Bonaccorso March 02, 2021 https://www.debian.org/security/faq - - ------------------------------------------------------------------------- Package : grub2 CVE ID : CVE-2020-14372 CVE-2020-25632 CVE-2020-25647 CVE-2020-27749 CVE-2020-27779 CVE-2021-20225 CVE-2021-20233 Several vulnerabilities have been discovered in the GRUB2 bootloader. CVE-2020-14372 It was discovered that the acpi command allows a privileged user to load crafted ACPI tables when Secure Boot is enabled. CVE-2020-25632 A use-after-free vulnerability was found in the rmmod command. CVE-2020-25647 An out-of-bound write vulnerability was found in the grub_usb_device_initialize() function, which is called to handle USB device initialization. CVE-2020-27749 A stack buffer overflow flaw was found in grub_parser_split_cmdline. CVE-2020-27779 It was discovered that the cutmem command allows a privileged user to remove memory regions when Secure Boot is enabled. CVE-2021-20225 A heap out-of-bounds write vulnerability was found in the short form option parser. CVE-2021-20233 A heap out-of-bound write flaw was found caused by mis-calculation of space required for quoting in the menu rendering. Further detailed information can be found at https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot For the stable distribution (buster), these problems have been fixed in version 2.02+dfsg1-20+deb10u4. We recommend that you upgrade your grub2 packages. For the detailed security status of grub2 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/grub2 Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAmA+ftVfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0RyFQ/+LdwWdxYOmXW3TCu/X5ChyjmXUO5nitRcUtpwuWjUjyIzcH5Q8SMX793s RidbruWIb9JE3vvdFHfOpqtF+xVsTwa0CH1dmWSsFYgIycLjzXetMuK0Fn3z14R3 C9wMbO6gTHob38+2LdnDr4GM4iCThxT0ekyFNawUZjtQPaKKNIL1F6eQm3kJrnNB nagQBUZbfewqrYClXGNxW4kESP47Y15eTiLDgqsjIPOtfxPi9ehy8+5vqQeO8YEt GojDHauHb3gxQVjmkFKIj2pJVVNXNocFP8E7CtZ/l8HPq7zwbcFq40h0zAWhcPmN Wxw1n3qfY9cwDn8hSU5s19CeYqejumZcoSuh74CfdPbwJ+gY0XZN9vJmsJqksPKp 8diwnyCOCcKofTl3zwE7+nxvG+aV+SCy6XI9XG35RnNEHDhprimLENlHXxCo8Fbk v2/wjjdsZ3ZQlXMFlr9bhBscgeewAk4SrGkxRKrlN/8SL9wFsL8xnlN7/K7HA5RY DorPIF3NOQQz21K24TvpILoKGlJgNbIPELssbrnDIdtCLhhDS1ZQ9PaHuRWIkich 3+Jp0e2JwHv92NaeBk0sRNSSa2metw8PpBs9xYHuAMCLfWJcRkTxnbWG7M3o3MqB 7dDsQMZnN+fS+3IlUU1XlVbUcPDT4rQSuUH46uYEfhKzRG99YBY= =phC9 - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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