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Distro-nix — Fri, 24 Jul 2026 23:31:38 GMT

Welcome to the Debian User Forum Cache.: type in title

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	= Welcome to the Debian ~~User~~ Forum Cache. =		= Welcome to the Debian Users Forum Cache. =

	This wiki is dedicated specific member solutions from the [https://forums.debian.net Debian User Forums] and not to be confused with the larger man style documentation driven official [https://wiki.debian.org Debian Project Wiki].		This wiki is dedicated specific member solutions from the [https://forums.debian.net Debian User Forums] and not to be confused with the larger man style documentation driven official [https://wiki.debian.org Debian Project Wiki].

Security Hardening for Debian Users: Protecting Against Targeted Attacks

Blackcat568 — Sun, 19 Jul 2026 17:12:33 GMT

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Security Hardening for Debian Users: Protecting Against Targeted Attacks

Donald — Tue, 07 Jul 2026 04:12:52 GMT

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			This paper is written for a specific scenario that most users will not encounter, it is advised to use this advice with caution.

	== Security Hardening for Debian Users: Protecting Against Targeted Attacks ==		== Security Hardening for Debian Users: Protecting Against Targeted Attacks ==

Security Hardening for Debian Users: Protecting Against Targeted Attacks

Blackcat568 — Fri, 03 Jul 2026 14:08:25 GMT

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 The adversary type described in this article is '''experienced and resourceful'''. Such actors develop software capable of bypassing default configurations of operating systems — both Linux and Windows. This is profitable: a successful "universal key" or exploit that works against many default deployments can grant stealthy access to a large number of machines.
-At the same time, creating such a universal key for systems with complex, individualized security configurations is substantially harder and often impractical: each machine will have a different set of rules, profiles and policies, and the exploit must be adapted per configuration. That significantly raises the attacker's cost.<blockquote>'''Conclusion: do not leave a freshly installed system with default security settings. Apply deliberate, deep, and individualized hardening — least-privilege policies, properly configured access control mechanisms (AppArmor/SELinux), strict firewall rules, verified update policies and monitoring. This increases the attacker's cost and complexity and makes automated widespread exploitation much harder.'''</blockquote>
+At the same time, creating such a universal key for systems with complex, individualized security configurations is substantially harder and often impractical: each machine will have a different set of rules, profiles and policies, and the exploit must be adapted per configuration. That significantly raises the attacker's cost.
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 ====== Main Aspects of System Hardening ======
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 Configuration changes should be applied to the host system '''only after confirming correct and stable operation in the test environment.'''
 Additional recommendations:
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 . Use advanced network filtering settings: iptables or nftables, or a commercial firewall.
 In addition to blocking all unnecessary incoming connections (on most home workstations, you can block all incoming traffic), be sure to also restrict outgoing connections — block all ports and ranges that are not required by the system and applications. This reduces the attack surface.
 My nftables config can be viewed [https://wiki.debian.org/Security/ProtectingAgainstTargetedAttacks/SecurityConfigsAndLogs#| here].

HowTo build latest mainline kernel packages for Trixie

Morgwai — Thu, 02 Jul 2026 08:42:40 GMT

Re-import from the forum: tiny grammar improvement

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	debian/rules orig		debian/rules orig
	</pre>		</pre>
			This will generate <code>debian/control</code> and apply all the patches from <code>debian/patches</code>. It may happen that some of the patches cannot be applied cleanly due to changes in the involved parts of the source code. Sometimes a patch may be already applied in the latest upstream version (this is common situation for security patches), in which case you can simply remove it from <code>debian/patches</code>. Otherwise you need decide whether to rework such patch or if it concerns features you don't use, in which case you can remove it also.

	</li><li> Several build profiles are defined, described in <code>debian/README.source</code>. You almost certainly don't need "udeb" packages and most probably don't need packages with documentation, so consider at least <code>export DEB_BUILD_PROFILES="nodoc noudeb"</code>. Note that applying some of the profiles may modify your kernel config (for example <code>pkg.linux.nokerneldbg</code> and <code>pkg.linux.nokerneldbginfo</code>).		</li><li> Several build profiles are defined, described in <code>debian/README.source</code>. You almost certainly don't need "udeb" packages and most probably don't need packages with documentation, so consider at least <code>export DEB_BUILD_PROFILES="nodoc noudeb"</code>. Note that applying some of the profiles may modify your kernel config (for example <code>pkg.linux.nokerneldbg</code> and <code>pkg.linux.nokerneldbginfo</code>).

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Security Hardening for Debian Users: Protecting Against Targeted Attacks

Security Hardening for Debian Users: Protecting Against Targeted Attacks

Security Hardening for Debian Users: Protecting Against Targeted Attacks

HowTo build latest mainline kernel packages for Trixie