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Ubuntu Security Notice USN-5794-1
Ubuntu Security Notice 5794-1 - It was discovered that the NFSD implementation in the Linux kernel did not properly handle some RPC messages, leading to a buffer overflow. A remote attacker could use this to cause a denial of service or possibly execute arbitrary code. Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation in the Linux kernel contained multiple use-after-free vulnerabilities. A physically proximate attacker could use this to cause a denial of service or possibly execute arbitrary code.
==========================================================================Ubuntu Security Notice USN-5794-1January 06, 2023linux-aws vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 16.04 ESMSummary:Several security issues were fixed in the Linux kernel.Software Description:- linux-aws: Linux kernel for Amazon Web Services (AWS) systemsDetails:It was discovered that the NFSD implementation in the Linux kernel did notproperly handle some RPC messages, leading to a buffer overflow. A remoteattacker could use this to cause a denial of service (system crash) orpossibly execute arbitrary code. (CVE-2022-43945)Tamás Koczka discovered that the Bluetooth L2CAP handshake implementationin the Linux kernel contained multiple use-after-free vulnerabilities. Aphysically proximate attacker could use this to cause a denial of service(system crash) or possibly execute arbitrary code. (CVE-2022-42896)It was discovered that the Xen netback driver in the Linux kernel did notproperly handle packets structured in certain ways. An attacker in a guestVM could possibly use this to cause a denial of service (host NICavailability). (CVE-2022-3643)It was discovered that an integer overflow vulnerability existed in theBluetooth subsystem in the Linux kernel. A physically proximate attackercould use this to cause a denial of service (system crash).(CVE-2022-45934)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 16.04 ESM: linux-image-4.4.0-1153-aws 4.4.0-1153.168 linux-image-aws 4.4.0.1153.157After a standard system update you need to reboot your computer to makeall the necessary changes.ATTENTION: Due to an unavoidable ABI change the kernel updates havebeen given a new version number, which requires you to recompile andreinstall all third party kernel modules you might have installed.Unless you manually uninstalled the standard kernel metapackages(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,linux-powerpc), a standard system upgrade will automatically performthis as well.References: https://ubuntu.com/security/notices/USN-5794-1 CVE-2022-3643, CVE-2022-42896, CVE-2022-43945, CVE-2022-45934
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Ubuntu Security Notice 5809-1 - Kyle Zeng discovered that the sysctl implementation in the Linux kernel contained a stack-based buffer overflow. A local attacker could use this to cause a denial of service or execute arbitrary code. Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation in the Linux kernel contained multiple use-after-free vulnerabilities. A physically proximate attacker could use this to cause a denial of service or possibly execute arbitrary code.
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platform_callback_stub in misc subsystem within OpenHarmony-v3.0.5 and prior versions has an authentication bypass vulnerability which allows an "SA relay attack".Local attackers can bypass authentication and attack other SAs with high privilege.
platform_callback_stub in misc subsystem within OpenHarmony-v3.0.5 and prior versions has an authentication bypass vulnerability which allows an "SA relay attack".Local attackers can bypass authentication and attack other SAs with high privilege.
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Guests can trigger NIC interface reset/abort/crash via netback It is possible for a guest to trigger a NIC interface reset/abort/crash in a Linux based network backend by sending certain kinds of packets. It appears to be an (unwritten?) assumption in the rest of the Linux network stack that packet protocol headers are all contained within the linear section of the SKB and some NICs behave badly if this is not the case. This has been reported to occur with Cisco (enic) and Broadcom NetXtrem II BCM5780 (bnx2x) though it may be an issue with other NICs/drivers as well. In case the frontend is sending requests with split headers, netback will forward those violating above mentioned assumption to the networking core, resulting in said misbehavior.
Ubuntu Security Notice 5755-1 - It was discovered that the NFSD implementation in the Linux kernel did not properly handle some RPC messages, leading to a buffer overflow. A remote attacker could use this to cause a denial of service or possibly execute arbitrary code. Jann Horn discovered that the Linux kernel did not properly track memory allocations for anonymous VMA mappings in some situations, leading to potential data structure reuse. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.
Ubuntu Security Notice 5754-1 - It was discovered that the NFSD implementation in the Linux kernel did not properly handle some RPC messages, leading to a buffer overflow. A remote attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a memory leak existed in the IPv6 implementation of the Linux kernel. A local attacker could use this to cause a denial of service.
An issue was discovered in the Linux kernel through 6.0.10. l2cap_config_req in net/bluetooth/l2cap_core.c has an integer wraparound via L2CAP_CONF_REQ packets.
There are use-after-free vulnerabilities in the Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect and l2cap_le_connect_req functions which may allow code execution and leaking kernel memory (respectively) remotely via Bluetooth. A remote attacker could execute code leaking kernel memory via Bluetooth if within proximity of the victim. We recommend upgrading past commit https://www.google.com/url https://github.com/torvalds/linux/commit/711f8c3fb3db61897080468586b970c87c61d9e4 https://www.google.com/url