New hardening in #sydbox #git: Deleted File Access Mediation, inspired by #AppArmor flag PATH_MEDIATE_DELETED: https://man.exherbo.org/syd.7.html#Deleted_File_Access_Mediation #exherbo #linux #security

#Sydbox containers are not affected by the new LPE #Fragnesia because: 1. Unprivileged user/network namespaces are denied unless trace/allow_unsafe_namespace:user,net 2. Kernel algorithm (AF_ALG) sockets are denied unless trace/allow_unsafe_kcapi:true 3. Socket option TCP_ULP is denied unless trace/allow_unsafe_setsockopt:true. You may sleep in peace: https://raw.githubusercontent.com/v12-security/pocs/d4043edc2acbd75d093e3f5795751b678c66b259/fragnesia/fragnesia.c #exherbo #linux #security

I made an #asciicast showcasing Ghost Mode of #sydbox: https://asciinema.org/a/1039185 #exherbo #linux #security

#Sydbox 3.53.0 is released! This is a feature release improving sandbox categories walk, stat, and adding the new category list for directory listing which allows easy use of walk+list categories for path hiding. readlink is also split from stat category which is by far the most common syscall so this helps with overhead of other categories. We also have bunch of security fixes. Full story, as always, is in the ChangeLog, thanks for flying Syd: https://gitlab.exherbo.org/sydbox/sydbox/-/blob/main/ChangeLog.md?ref_type=heads#3530 #exherbo #linux #security

Fun exercise for #Syd users: Run "PATH= /path/to/syd" and try to break out of the default restricted #bash shell session. You're in a directory that does not exist and you have no access to external commands. It's not easy or where's the fun? #exherbo #linux #security

AF_ALG is marked deprecated as response to copy.fail. Somewhat sad to see a useful API die: https://lore.kernel.org/linux-crypto/2[email protected]/ #exherbo #linux #security

News from #Sydbox #git: New option trace/force_wx_open: Specify whether creating/writing open(2) family system calls for executables should be denied regardless of path. This option is restricted to creat, open, openat, and openat2 syscalls and may be combined with trace/force_umask option to confine filesystem as Write XOR Execute. New profile "wx" combines the new option with trace/force_umask:7177 to confine filesystem as W^X. User profile includes wx profile. #exherbo #linux #security

#Sydbox 3.52.0 is released! I've just merged 428 commits from next to main to make this release. It includes no new features, only bug fixes. Some of these bug fixes are security critical and you're recommended to upgrade as soon as possible. Full story, as always, is in the ChangeLog, thanks for flying Syd: https://gitlab.exherbo.org/sydbox/sydbox/-/blob/main/ChangeLog.md #exherbo #linux #security

Mitigation against copy.fail in upcoming #Sydbox: Syd will reject to open SUID files regardless of mode unless the option trace/allow_unsafe_open_suid:1 is set. This does not prevent exploitation altogether as the attacker can write to files such as /etc/passwd, however it raises the bar with very little added cost. #exherbo #linux #security

#GVisor supports only x86_64, arm64 yet they claim they run everywhere. #Sydbox passes tests on x86_64, i686, x32, arm64, armv7, ppc64, ppc64le, ppc, s390x, loongarch64, mips64el, and mipsel but I won't claim we are portable until we have mips64, mips, m68k and sparc! Huge thanks to Compile Farm people for enabling us to test Syd on various different architectures! #exherbo #linux #security