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CVE-2020-25647

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

A flaw was found in grub2 in versions prior to 2.06. 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 Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Gnu Netapp and 1 more
Products
Fedora Grub2 Ontap Select Deploy Administration Utility and 9 more
CVE-2020-25632

grub2: Use-after-free in rmmod command

A flaw was found in grub2 in versions prior to 2.06. 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 highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 3.1 · 8.2 High EPSS 1.2% KEV · Not listed
Vendors
Fedoraproject Gnu Netapp and 1 more
Products
Fedora Grub2 Ontap Select Deploy Administration Utility and 9 more
CVE-2020-25212

kernel: TOCTOU mismatch in the NFS client code

A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452.

CVSS 3.1 · 7.0 High EPSS < 1% KEV · Not listed
Vendors
Canonical Debian Linux and 2 more
Products
Ubuntu Linux Debian Linux Linux Kernel and 7 more
CVE-2020-25211

kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c

In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.

CVSS 3.1 · 6.0 Medium EPSS < 1% KEV · Not listed
Vendors
Debian Fedoraproject Linux and 1 more
Products
Debian Linux Fedora Linux Kernel and 6 more
CVE-2020-24394

kernel: umask not applied on filesystem without ACL support

In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesystem lacks ACL support, aka CID-22cf8419f131. This occurs because the current umask is not considered.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Canonical Linux Opensuse and 3 more
Products
Ubuntu Linux Linux Kernel Leap and 8 more
CVE-2020-22219

flac: Remote Code Execution (RCE) via the bitwriter_grow_ function, by supplying crafted input to the encoder

Buffer Overflow vulnerability in function bitwriter_grow_ in flac before 1.4.0 allows remote attackers to run arbitrary code via crafted input to the encoder.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Flac Project Redhat
Products
Flac Enterprise Linux Rhel Aus and 3 more
CVE-2020-15862

net-snmp: Improper Privilege Management in EXTEND MIB may lead to privileged commands execution

Net-SNMP through 5.8 has Improper Privilege Management because SNMP WRITE access to the EXTEND MIB provides the ability to run arbitrary commands as root.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Canonical Net-snmp Netapp and 1 more
Products
Ubuntu Linux Net-snmp Cloud Backup and 8 more
CVE-2020-15707

GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.

Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.

CVSS 3.1 · 5.7 Medium EPSS 1.6% KEV · Not listed
Vendors
Canonical Debian Gnu and 5 more
Products
Ubuntu Linux Debian Linux Grub2 and 16 more
CVE-2020-15706

GRUB2 contains a race condition leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing.

GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical Debian Gnu and 4 more
Products
Ubuntu Linux Debian Linux Grub2 and 15 more
CVE-2020-15705

GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

CVSS 3.1 · 6.4 Medium EPSS 1.4% KEV · Not listed
Vendors
Canonical Debian Gnu and 4 more
Products
Ubuntu Linux Debian Linux Grub2 and 15 more
CVE-2020-14372

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

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 attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.

CVSS 3.1 · 7.5 High EPSS 1.7% KEV · Not listed
Vendors
Fedoraproject Gnu Netapp and 1 more
Products
Fedora Grub2 Cloud Backup and 10 more
CVE-2020-14364

QEMU: usb: out-of-bounds r/w access issue while processing usb packets

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0. This issue occurs while processing USB packets from a guest when USBDevice 'setup_len' exceeds its 'data_buf[4096]' in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the privileges of the QEMU process on the host.

CVSS 3.1 · 5.0 Medium EPSS 5.4% KEV · Not listed
Vendors
Canonical Debian Fedoraproject and 3 more
Products
Ubuntu Linux Debian Linux Fedora and 11 more
CVE-2020-14351

kernel: performance counters race condition use-after-free

A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Debian Linux Redhat
Products
Debian Linux Linux Kernel Enterprise Linux and 5 more
CVE-2020-14311

grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical Gnu Opensuse and 1 more
Products
Ubuntu Linux Grub2 Leap and 8 more
CVE-2020-14310

grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow

There is an issue on grub2 before version 2.06 at function read_section_as_string(). It expects a font name to be at max UINT32_MAX - 1 length in bytes but it doesn't verify it before proceed with buffer allocation to read the value from the font value. An attacker may leverage that by crafting a malicious font file which has a name with UINT32_MAX, leading to read_section_as_string() to an arithmetic overflow, zero-sized allocation and further heap-based buffer overflow.

CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical Gnu Opensuse and 1 more
Products
Ubuntu Linux Grub2 Leap and 8 more
CVE-2020-14309

grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow

There's an issue with grub2 in all versions before 2.06 when handling squashfs filesystems containing a symbolic link with name length of UINT32 bytes in size. The name size leads to an arithmetic overflow leading to a zero-size allocation further causing a heap-based buffer overflow with attacker controlled data.

CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed
Vendors
Gnu Opensuse Redhat
Products
Grub2 Leap Enterprise Linux and 4 more
CVE-2020-14308

grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent heap-based buffer overflow

In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This leads the function to return invalid memory allocations which can be further used to cause possible integrity, confidentiality and availability impacts during the boot process.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Gnu Opensuse Redhat
Products
Grub2 Leap Enterprise Linux and 4 more
CVE-2020-12770

kernel: sg_write function lacks an sg_remove_request call in a certain failure case

An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a certain failure case, aka CID-83c6f2390040.

CVSS 3.1 · 6.7 Medium EPSS < 1% KEV · Not listed
Vendors
Canonical Debian Fedoraproject and 3 more
Products
Ubuntu Linux Debian Linux Fedora and 39 more
CVE-2020-12654

kernel: heap-based buffer overflow in mwifiex_ret_wmm_get_status function in drivers/net/wireless/marvell/mwifiex/wmm.c

An issue was found in Linux kernel before 5.5.4. mwifiex_ret_wmm_get_status() in drivers/net/wireless/marvell/mwifiex/wmm.c allows a remote AP to trigger a heap-based buffer overflow because of an incorrect memcpy, aka CID-3a9b153c5591.

CVSS 3.1 · 7.1 High EPSS 1.2% KEV · Not listed
Vendors
Linux Redhat
Products
Linux Kernel Enterprise Linux Enterprise Mrg and 5 more