#sudoers

With sudoers users can be granted to run commands as the root user without needing the root password  — hence they only need to enter their password, not the root password. So if not done correctly, those misconfigured users or groups at sudoers may be god-like.

sudoers Configuration Provide Superuser Access To Normal User

SUDO means “Substitute for super user” or “Super user do”.  Using sudo access or sudoers configuration normal user can execute commands as root privileges without providing them an root user password. sudoers configuration

This sudoers configuration will make super power to manage/provide access to particular for user, for particular command access. Even we can deny access to particular command…

El este pequeño artículo vamos a ver como configurar “un poco” el comando sudo y su salida. Todo esto lo vamos a poder hacer desde el archivo sudoers. Algunos usuarios me han preguntado como modificar los mensajes de solicitud de clave de root, así como el de error cuando te equivocas escribiéndola. También alguna que otra pregunta que me han mandado ha sido sobre como poder obtener algún tipo de…

DYLD_PRINT_TO_FILE exploit found in the wild for OS X

A vulnerability exists in OS X where an attacker can take advantage of a routine that is generally intended for logging, and overwrite system files. In doing so, the attacker can modify the system to allow bypassing of OS X’s security measures and give full “root” access to malware installers. The result of this is further modification to an affected Mac can be performed without any indication or…

Sudo and Su Configuration Examples

Sudo and SU

As well all know, at least I hope we do, Sudo (aka “Super Do”) and Su (aka Super User/Substitute User) are the utilities in Linux that allow a regular user to acquire elevated permissions to complete common system tasks. Of course, if configured securely, Sudo and Su will only allow a user to complete certain tasks. On the other hand, if sudo and su are configured incorrectly, it…

Ubuntu 사용자 추가

adduser <#UserId#>

그렇게 추가한 사용자로 로그인한 후 sudo 명령어로 root 권한을 얻으려 할 때 <#UserId#> is not in the sudoers file. This incident will be reported. 라면서 root 권한을 얻지 못한다면_!?

응_? sudoers 파일은 뭐지… ( 당황. 바로 검색. )

결론은 대략 sudo 명령어에 대한 설정을 다루는 파일이고 추가한 사용자에 대한 정보를 수정해줘야 한다는 것.

root로 로그인한 후 ( 관리자 권한이 필요한데 sudo 가 안되니깐… )

visudo -f /etc/sudoers 로 파일을 열고

sudoers 파일의 경우 일반 vi 가 아닌 visudo 를 쓰는데 저장할 때 문법 체크도 해준다고 한다.

root ALL=(ALL:ALL) ALL 다음 라인에 <#UserId#> ALL=(ALL:ALL) ALL을 넣어준다.

저장하면 끝

출처

http://thisok.org/amina/print.php?bo_table=Linux&wr_id=122

Solution: AWS – removing ec2-user from sudo list #computers #dev #answer

AWS – removing ec2-user from sudo list

I’m running a production-level Amazon ec2 instance, and I want to close out root privileges to all users. Normally, when one logs in to the instance as ec2-user, the ec2-user immediately gets sudo privileges, which I am trying to do away with in order to ensure security.

I was able to set a new password for the root user, and I went into /etc/sudoers to try…