2/1/2024 0 Comments Exit ssh session putty![]() By default, this relationship is that of only its descendants when the above classic criteria is also met. The sysctl settings (writable only with CAP_SYS_PTRACE) are:Ġ - classic ptrace permissions: a process can PTRACE_ATTACH to any other process running under the same uid, as long as it is dumpable ġ - restricted ptrace: a process must have a predefined relationship with the inferior it wants to call PTRACE_ATTACH on. Since ptrace is not commonly used by non-developers and non-admins, system builders should be allowed the option to disable this debugging system. SSH session hijacking ( ) and arbitrary code injection ( ) attacks already exist and remain possible if ptrace is allowed to operate as before. Firefox, SSH sessions, GPG agent, etc) to extract additional credentials and continue to expand the scope of their attack without resorting to user-assisted phishing. Pidgin) was compromised, it would be possible for an attacker to attach to other running processes (e.g. One particularly troubling weakness of the Linux process interfaces is that a single user is able to examine the memory and running state of any of their processes. Setting ptrace_scope as 0 is not recommended.Īs Linux grows in popularity, it will become a larger target for malware. This does not mean the process becomes a child of the new shell. Note reptyr only attaches a process to another terminal. Where PID is the PID of the process you want to attach to a new terminal. Please see security considerations below. The setting will be applied at the next reboot. If the file doesn't exist but the /etc/sysctl.d/ directory does, then it's probably enough to create it with the following content: _scope = 0 You can enable it temporarily by doing echo 0 > /proc/sys/kernel/yama/ptrace_scopeĪs root, or permanently by editing the file /etc/sysctl.d/nf, which also contains more information about this setting. On Ubuntu Maverick and higher, this ability is disabled by default for security reasons. Reptyr depends on the ptrace(2) system call to attach to the remote program. (The manual mentions screen, you can use tmux instead, whichever you prefer). ![]() Started a long-running process over ssh, but have to leave and don't want to interrupt it? Just start a screen, use reptyr to grab it, and then kill the ssh session and head on home. Reptyr is a utility for taking an existing running program and attaching it to a new terminal. This is exactly the case man 1 reptyr explicitly mentions: ![]()
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