linux privilege escalation

Vamei Source: Http://www.cnblogs.com/vamei Welcome reprint, Please also keep this statement. Thank you!As a Linux user, we don't need to be particularly concerned with the following mechanisms. However, when we write a Linux application, we should pay attention to the implementation of the following switches in the program (if necessary), so that our program conforms to the "least

In the Linux operating system, root is the highest, and is also known as the owner of the Super privilege. The actions that ordinary users cannot perform, which root users can accomplish, are also called Super Admin users. In a system, each file, directory, and process is owned by one user, and no user is permitted to operate on other ordinary users, except for root. Root privileges also show that root can

highest privileges. And the general application is in the R3 state-the user state. In Linux, there are also R1 and R2 two levels, which generally belong to the level of the driver. The Windows platform does not have R1 and R2 two levels, with only R0 kernel state and R3 User Configuration. On a permission constraint, a high privilege level state can be used to read data in a low-level state, such as a proc

owner of the permissions constitute 4+2+1=7, the same group of users have read and write permissions, then its permissions constitute 4+2=6, others do not have any permissions, then their permissions constitute 0+0+0=0, so we want to implement the permission problem of the above example, The chmod 760 Ceshi is represented by a numerical method, so the effect is identical. I like what kind of look at your taste. Copyright NOTICE: This article for Bo Master original article, without Bo Master per

Article Title: Linux Local Elevation of Privilege Vulnerability, please update the udev program immediately. Linux is a technology channel of the IT lab in China. Linux udev programs, including desktop applications, Linux system management, kernel research, embedded systems

Tag: Otherwise code runs its own dir requires mod pass numberLinux privilege Supplement: RWT RWT RWS RWS Special PrivilegesAs we all know, Linux file permissions such as: 777;666, in fact, as long as the corresponding file with the UID permissions, you can use to add the identity of the person to run this file. So we just need to copy bash out to another place, and then root with the UID permissions, as lon

you use Visudo editing, the syntax is checked automatically, and if you edit with other editors, such as vi/vim, you need to use VISUDO–C to check the syntax, which could cause a failure ; sudoers profile is invalid and sudo permission is not available for all users)[[emailprotected] ~]# visudo -c/etc/sudoers：解析正确[[emailprotected] ~]#sudo configuration fileIf the server cluster is a shared sudoers configuration file for a single server, you can use the distribution software to distribute the su

Linux/unzip tusudo Elevation of Privilege without entering a passwordPreface The sudo permission is required for zip packaging during the process of writing an automated packaging script, but it is too troublesome to enter the password each time. Therefore, we will introduce the method for sudo to escalate permissions without entering a password.Modify/etc/sudoers. If our current user is "wzy", add the foll

Special permissions:Passwd:sSUID: When running a program, the owner of the corresponding process is the owner of the program file itself, not the initiator;chmod u+s FileName, if file has Execute permission is shown as lowercase s, otherwise uppercase S is displayed; chmod u-s FileName,SGID: When running a program, the group of the corresponding process is the genus of the program file itself, not the basic group to which the launcher belongs; chmod g+s FileName, chmod g+s FileName,Sticky:

Chattr modify file or directory file attributes, add Super Permissions-R Recursive modified file subdirectory-V Show details of modified content+ Append parameters on original basis-Minus parameters= with the new parameter specifiedA append can only add data to the file after setting the parameter, cannot delete the common language log fileC Commpress Set whether the file is compressed after the storageI can't do anything.s safe to delete files, directoriesU keep data block, can recover after de

Linux/Ubuntu sudo Elevation of Privilege without entering the password, ubuntusudoPreface The sudo permission is required for zip packaging during the process of writing an automated packaging script, but it is too troublesome to enter the password each time. Therefore, we will introduce the method for sudo to escalate permissions without entering a password.Modify/etc/sudoers. If our current user is "wzy",

, such as SFTP, SCP and other ways connection will be abnormal, the server does not restart the situation, as long as can enter the system can be downloaded through the wget command file or Password authentication error when entering single user mode start Network Service download file to exception server#/etc/init.d/network start#wget X.x.x.x/filename.bak3, execute the command in the exception server Setfacl--restore=filename.bak can restore the current system permissions to the same as the nor

(write) permission, and no corresponding permission is substituted with "-" in the corresponding bit. The next 3-bit "-w" means that all users except the file's owning user and the user group that owns the user have R (read) permissions to the file, without the W (write) and X (execute) permissions. The number represented is 754.Here's a summary of the rules for permission characters:L Altogether 10 bits, the first digit represents the type, "-" represents the file, "D" represents the folderThe