Mehrere Probleme in GRUB
ID: | USN-4992-1 |
Distribution: | Ubuntu |
Plattformen: | Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10 |
Datum: | Fr, 18. Juni 2021, 06:31 |
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 |
Applikationen: | GRUB |
Originalnachricht |
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--===============5173697455867734880== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="e8+KQMb5E3o6vG/H" Content-Disposition: inline --e8+KQMb5E3o6vG/H Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inlin Content-Transfer-Encoding: quoted-printable ========================================================================== 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 --e8+KQMb5E3o6vG/H Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpgY7tWAjCaQ8jrvULwmejQBegfQFAmDMHlEACgkQLwmejQBe gfSVsw/8CLISMcd/gzOXtw+byds2vJ659yr9UcW2MGiKwTnD/ejrj/fr223zV+aE KXZBZA7zw/poedynV1lEvlHrm6Qkk2Cdi9Z/QX842QVZx75Yzl8s6kL4NXwbAWNK l8AnR/naKaVZQ3y3UJL/qX0Cu6bdx1SCQWAAYRBkodxAG80ZyIJaZQWv8jZqYSZn cLXF5vIpwP9BuILOducEMMOq49fWVt/+Pn7Dj70xBXBPeEFpNdTqBfFZfer6uWnS PA6T6Sj3nwUBOQ2YWpDQ/3vXApqOCiCNPMetdi0hDl73aXSfxPJuM3DIH8UQTqBW 65aYEFarGIiUGObssDmzu718/DniMbFcf1c1EAgSadSjMpc5WwlL2PAn5+nxE/Fc J4pBPsncYw8yVLAmhUtECrPZFPJAPNSwTpHKcF5+MEAPeKfzyu9h5BOCgvaTth/T X8rQFgEfLqTeZ78bzBV9kiu/hG5WgmyGKWbVSWwMbAIZVw2L5+5b/VodcvFYjiEt ajnMSLqlzaBZJqlyuNi7lPW8p5k1yRE2r/3zjTPGjXlRgNVvmZjM/2PV5+Olt2qm 5M3yxNsbo/kxRBzgjzj0Nsmgc7yQMF8mOfPD4jZmQaatkT6ChjK3FuHr1yJLj8wa NdrkeLU488nkASnE6lRD1axVJfRVXULg9wvZrqOsuUCft2N3q3Q= =/yrK -----END PGP SIGNATURE----- --e8+KQMb5E3o6vG/H-- --===============5173697455867734880== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline LS0gCnVidW50dS1zZWN1cml0eS1hbm5vdW5jZSBtYWlsaW5nIGxpc3QKdWJ1bnR1LXNlY3VyaXR5 LWFubm91bmNlQGxpc3RzLnVidW50dS5jb20KTW9kaWZ5IHNldHRpbmdzIG9yIHVuc3Vic2NyaWJl IGF0OiBodHRwczovL2xpc3RzLnVidW50dS5jb20vbWFpbG1hbi9saXN0aW5mby91YnVudHUtc2Vj dXJpdHktYW5ub3VuY2UK --===============5173697455867734880==-- |