Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs Exploit

Tested on Ubuntu 19.10, kernel "5.3.0-19-generic 20-Ubuntu". Ubuntu ships a filesystem "shiftfs" in fs/shiftfs.c in the kernel tree that doesn't exist upstream. This filesystem can be mounted from user namespaces, meaning that this is attack surface from unprivileged userspace in the default...

Ubuntu shiftfs refcount Underflow / Type Confusion

Ubuntu: refcount underflow and type confusion in shiftfs Tested on Ubuntu 19.10, kernel "5.3.0-19-generic 20-Ubuntu". Ubuntu ships a filesystem "shiftfs" in fs/shiftfs.c in the kernel tree that doesn't exist upstream. This filesystem can be mounted from user namespaces, meaning that this is...

CVE-2018-5733

A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing dhcpd to crash, by sending large amounts of traffic...

NewStart CGSL MAIN 5.04 : dhcp Multiple Vulnerabilities (NS-SA-2019-0010)

The remote NewStart CGSL host, running version MAIN 5.04, has dhcp packages installed that are affected by multiple vulnerabilities: - An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to cras...

kernel: l2tp: Race condition between pppol2tp_session_create() and l2tp_eth_create()

A race condition between pppol2tpsessioncreate and l2tpethcreate in net/l2tp/l2tpnetlink.c was found in the Linux kernel. Calling l2tptunnelfind may result in a new tunnel being created with tunnel id of a previously removed tunnel which wouldn't be protected by the reference counter...

Ubuntu 19.04 : Linux kernel vulnerabilities (USN-4069-1)

It was discovered that an integer overflow existed in the Linux kernel when reference counting pages, leading to potential use-after-free issues. A local attacker could use this to cause a denial of service system crash or possibly execute arbitrary code. CVE-2019-11487 Jann Horn discovered that ...

EulerOS Virtualization 3.0.1.0 : dhcp (EulerOS-SA-2019-1443)

According to the versions of the dhcp packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : - ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service applicati...

Oracle Linux 7 : kernel (ELSA-2019-0818)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-0818 advisory. - kvm kvm: fix kvmioctlcreatedevice reference counting Paolo Bonzini 1671922 1671923 CVE-2019-6974 - kvm KVM: nVMX: unconditionally cancel preemption...

PT-2022-4312 · Systemd +7 · Systemd +7

Name of the Vulnerable Software and Affected Versions: systemd affected versions not specified Description: A use-after-free issue was found in systemd due to the on stream io function and dns stream complete function in 'resolved-dns-stream.c' not incrementing the reference counting for the...

Race condition

In the Linux kernel before 4.20.8, kvmioctlcreatedevice in virt/kvm/kvmmain.c mishandles reference counting because of a race condition, leading to a use-after-free...

CVE-2019-6974

In the Linux kernel before 4.20.8, kvmioctlcreatedevice in virt/kvm/kvmmain.c mishandles reference counting because of a race condition, leading to a use-after-free...

CVE-2019-6974

In the Linux kernel before 4.20.8, kvmioctlcreatedevice in virt/kvm/kvmmain.c mishandles reference counting because of a race condition, leading to a use-after-free...

CVE-2019-6974

In the Linux kernel before 4.20.8, kvmioctlcreatedevice in virt/kvm/kvmmain.c mishandles reference counting because of a race condition, leading to a use-after-free...

ALPINE-CVE-2018-5736

An error in zone database reference counting can lead to an assertion failure if a server which is running an affected version of BIND attempts several transfers of a slave zone in quick succession. This defect could be deliberately exercised by an attacker who is permitted to cause a vulnerable...

CVE-2018-5736

An error in zone database reference counting can lead to an assertion failure if a server which is running an affected version of BIND attempts several transfers of a slave zone in quick succession. This defect could be deliberately exercised by an attacker who is permitted to cause a vulnerable...

CVE-2018-5736

CVE-2018-5736 is an ISC BIND vulnerability affecting versions 9.12.0 and 9.12.1. The issue is an error in the zone database reference counting that can trigger an assertion failure when a vulnerable server performs several slave-zone transfers in quick succession (for example after valid NOTIFY m...

Google gVisor Elevation of Privilege Vulnerability

Google gVisor is a user-space kernel written in the Go language for use in Linux systems. A security vulnerability in the pkg/sentry/kernel/shm/shm.go file in versions of Google gVisor prior to 2018-11-01 stems from the program not handling reference counting correctly. An attacker could use the...

Memory corruption

pkg/sentry/kernel/shm/shm.go in Google gVisor before 2018-11-01 allows attackers to overwrite memory locations in processes running as root but not escape the sandbox via vectors involving IPCRMID shmctl calls, because reference counting is mishandled...

CVE-2018-19333

pkg/sentry/kernel/shm/shm.go in Google gVisor before 2018-11-01 allows attackers to overwrite memory locations in processes running as root but not escape the sandbox via vectors involving IPCRMID shmctl calls, because reference counting is mishandled...

Microsoft Windows - Double Dereference in NtEnumerateKey Elevation of Privilege Exploit

Exploit for windows platform in category dos / poc Windows: Double Dereference in NtEnumerateKey Elevation of Privilege Platform: Windows 10 1803 not vulnerable in earlier versions Class: Elevation of Privilege Summary: A number of registry system calls do not correctly handle pre-defined keys...