Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5210-1)

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5210-1 advisory. Nadav Amit discovered that the hugetlb implementation in the Linux kernel did not perform TLB flushes under certain conditions. A local...

kexec-tools security, bug fix, and enhancement update

2.0.20-57.0.3 - Merge 8.4 extra patches for SB boot environment Orabug: 33512440 2.0.20-57.0.2 - Merge SRPM/ol8-u4 orabug patches into SRPM/ol8-u5 Orabug: 33471981 2.0.20-57.0.1 - makedumpfile: Add support for newer kernels up to v5.12 Orabug: 33250117 2.0.20-57 - kdumpctl: enable secure boot on...

kernel: powerpc: RTAS calls can be used to compromise kernel integrity

A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down usually due to Secure Boot guest system running on top of PowerVM or KVM hypervisors pseries platform a root like local user could use this flaw to further increase their privileges to...

NewStart CGSL CORE 5.04 / MAIN 5.04 : grub2 Multiple Vulnerabilities (NS-SA-2021-0097)

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has grub2 packages installed that are affected by multiple vulnerabilities: - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This fla...

NewStart CGSL MAIN 6.02 : grub2 Multiple Vulnerabilities (NS-SA-2021-0133)

The remote NewStart CGSL host, running version MAIN 6.02, has grub2 packages installed that are affected by multiple vulnerabilities: - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an...

NewStart CGSL CORE 5.05 / MAIN 5.05 : grub2 Multiple Vulnerabilities (NS-SA-2021-0182)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has grub2 packages installed that are affected by multiple vulnerabilities: - A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This fla...

NewStart CGSL CORE 5.05 / MAIN 5.05 : shim Vulnerability (NS-SA-2021-0141)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has shim packages installed that are affected by a vulnerability: - A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows...

NewStart CGSL CORE 5.05 / MAIN 5.05 : grub2 Multiple Vulnerabilities (NS-SA-2021-0139)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has grub2 packages installed that are affected by multiple vulnerabilities: - A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw...

NewStart CGSL CORE 5.05 / MAIN 5.05 : fwupdate Vulnerability (NS-SA-2021-0136)

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has fwupdate packages installed that are affected by a vulnerability: - A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also...

Ubuntu: Security Advisory (USN-5120-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2021 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

USN-5120-1: Linux kernel (Azure) vulnerabilities

It was discovered that the f2fs file system in the Linux kernel did not properly validate metadata in some situations. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service system crash or possibly execute arbitrary code...

USN-5120-1 linux-azure-5.8 vulnerabilities

It was discovered that the f2fs file system in the Linux kernel did not properly validate metadata in some situations. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service system crash or possibly execute arbitrary code...

Huawei EulerOS: Security Advisory for grub2 (EulerOS-SA-2020-2574)

The remote host is missing an update for the Huawei EulerOS SPDX-FileCopyrightText: 2021 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-5106-1)

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5106-1 advisory. Valentina Palmiotti discovered that the iouring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this t...

Researchers Discover UEFI Bootkit Targeting Windows Computers Since 2012

Cybersecurity researchers on Tuesday revealed details of a previously undocumented UEFI Unified Extensible Firmware Interface bootkit that has been put to use by threat actors to backdoor Windows systems as early as 2012 by modifying a legitimate Windows Boot Manager binary to achieve persistence...

grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled

A flaw was found in grub2. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this...

grub2: Stack buffer overflow in grub_parser_split_cmdline()

A flaw was found in grub2. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with...

grub2: Out-of-bounds write in grub_usb_device_initialize()

A flaw was found in grub2. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the...

grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

A flaw was found in GRUB 2, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table SSDT containing code to overwrite the Linux kernel lockdown variable content direct...

grub2: Use-after-free in rmmod command

A flaw was found in grub2. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The...