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Privilege escalation is the act of exploiting a bug, a design flaw, or a configuration oversight in an operating system or software application to gain elevated access to resources that are normally protected from an application or user.
It is a local privilege escalation bug that exploits a race condition in the implementation of the copy-on-write mechanism in the kernel's memory-management subsystem. Computers and devices that still use the older kernels remain vulnerable.
A privilege level in the x86 instruction set controls the access of the program currently running on the processor to resources such as memory regions, I/O ports, and special instructions. There are 4 privilege levels ranging from 0 which is the most privileged, to 3 which is least privileged.
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sudo centralizes all privilege authorization information in a single configuration file, /etc/sudoers, which contains a list of users and the privileged applications and actions that those users are permitted to use. The grammar of the sudoers file is intended to be flexible enough to cover many different scenarios, such as placing restrictions ...
Best Server-Side Bug: Linux SCTP FWD Chunk Memory Corruption (CVE-2009-0065) David 'DK2' Kim; Best Privilege Escalation Bug: Linux udev Netlink Message Privilege Escalation (CVE-2009-1185) Sebastian Krahmer; Best Client-Side Bug: msvidctl.dll MPEG2TuneRequest Stack buffer overflow (CVE-2008-0015) Ryan Smith and Alex Wheeler
In computer programming and computer security, privilege separation (privsep) is one software-based technique for implementing the principle of least privilege. [1] [2] With privilege separation, a program is divided into parts which are limited to the specific privileges they require in order to perform a specific task. This is used to ...
A privilege is applied for by either an executed program issuing a request for advanced privileges, or by running some program to apply for the additional privileges. An example of a user applying for additional privileges is provided by the sudo command to run a command as superuser ( root ) user, or by the Kerberos authentication system.