Disable auto rewriting of files

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  • Qualcosa non va?
#184 4 commenti 0 reazioni 1 assegnatario Vedi su GitHub

@MarioHewardt ci sta già lavorando.

Dal 24/8/2024.

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Descrizione

investigate

Describe the bug

sysmon regularly rewrites file in /opt/sysmon and systemd unit file. It triggers changes in Host IDS like aide like:
d =.... mc.. .. . : /etc/systemd/system
f =.... mc..... . : /etc/systemd/system/sysmon.service
d =.... mc.. .. . : /opt/sysmon
f =.... mc..H.. . : /opt/sysmon/eventId
f =.... mc..... . : /opt/sysmon/rules.bin
f =.... mci.... . : /opt/sysmon/sysmon
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern4.15.o
f =b... mc..... . : /opt/sysmon/sysmonEBPFkern4.15_core.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern4.16.o
f =b... mc..... . : /opt/sysmon/sysmonEBPFkern4.16_core.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern4.17-5.1.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern4.17-5.1_core.o
f =b... mc..... . : /opt/sysmon/sysmonEBPFkern5.2.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern5.2_core.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern5.3-5.5.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern5.3-5.5_core.o
f =b... mc..... . : /opt/sysmon/sysmonEBPFkern5.6-.o
f =.... mc..... . : /opt/sysmon/sysmonEBPFkern5.6-_core.o
f =.... mc..... . : /opt/sysmon/sysmonLogView

from aide.conf man
o A b means that the block count has changed.
o A m means that the modification time has changed.
o A c means that the change time has changed.
o An i means that the inode has changed.
o A H means that one or more message digests have changed.

is there any way to disable this behaviour especially as files are unchanged most of the time?
I can mark files as immutable but prefer fixing at source and only have changes when package is updated (or kernel).

To Reproduce
Install sysmon and hids like aide. Aide Debian (or Ubuntu) has a daily check task by default.

Sysmon version
1.3.3 (upstream package)

Distro/kernel version

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.4 LTS
Release:        22.04
Codename:       jammy
# uname -a
Linux HOST 5.15.0-113-generic #123-Ubuntu SMP Mon Jun 10 08:16:17 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Sysmon configuration
Irrelevant

Logs
Irrelevant

Expected behavior
files including all binaries and kernel modules should not be changed without a defined action, typically package update of sysmon or kernel updates.
In its current form, it happens by itself even if no sysmon or kernel update and without configuration options.

Additional context
No change should happen to system without a controlled change operated by administrator or delegated systems, especially more on binaries and kernel modules.
Likely create issues for immutable systems.

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