CVE-2018-5750 Amazon Linux Security Advisory for kernel: ALAS2-2018-956

2018年3月26日 1556点热度 0人点赞 0条评论

漏洞类别：Amazon Linux

漏洞等级：

漏洞信息

Stack-based out-of-bounds read via vmcall instructionLinux kernel compiled with the KVM virtualization (CONFIG_KVM) support is vulnerable to an out-of-bounds read access issue. It could occur when emulating vmcall instructions invoked by a guest. A guest user/process could use this flaw to disclose kernel memory bytes.(CVE-2017-17741 )drivers/block/loop.c mishandles lo_release serialization allowing denial-of-serviceA flaw was found in the Linux kernel's handling of loopback devices. An attacker, who has permissions to setup loopback disks, may create a denial of service or other unspecified actions. (CVE-2018-5344 )pmd can become dirty without going through a COW cycleA flaw was found in the patches used to fix the 'dirtycow' vulnerability (CVE-2016-5195 ). An attacker, able to run local code, can exploit a race condition in transparent huge pages to modify usually read-only huge pages.(CVE-2017-1000405 )Improper sorting of GIDs in nfsd can lead to incorrect permissions being appliedLinux kernel contains a Incorrect Access Control vulnerability in NFS server (nfsd) that can result in remote users reading or writing files they should not be able to via NFS. This attack appear to be exploitable via NFS server must export a filesystem with the "rootsquash" options enabled. This vulnerability appears to have been fixed in after commit 1995266727fa. (CVE-2018-1000028 )Kernel address information leak in drivers/acpi/sbshc.c:acpi_smbus_hc_add() function potentially allowing KASLR bypassThe acpi_smbus_hc_add function in drivers/acpi/sbshc.c in the Linux kernel, through 4.14.15, allows local users to obtain sensitive address information by reading dmesg data from an SBS HC printk call.(CVE-2018-5750 )Speculative execution bounds-check bypassAn industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimization). There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Variant CVE-2017-5753 triggers the speculative execution by performing a bounds-check bypass. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to cross the syscall boundary and read privileged memory by conducting targeted cache side-channel attacks.(CVE-2017-5753 )