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Blog - #1

systemd Insecurity

Posted: 2022-01-29 (UTC+00:00)

-

Updated: 2022-11-14 (UTC+00:00)

- +

Updated: 2023-10-31 (UTC+00:00)

Table of Contents

-

Anyone who cares about security may want to switch from systemd as soon as possible; its lead - developer doesn't care about your security at all.

-
-

Issue #0 - Against CVE Assignment

-
-
"You don't assign CVEs to every single random bugfix we do, do you?"
+

Anyone who cares about security may want to switch from systemd as soon as possible; + its lead developer doesn't care about your security at all.

+
+

Issue #0 - Against CVE Assignment

+
"You don't assign CVEs to every single random bugfix we do, do + you?"

- Lennart Poettering, systemd lead developer

-

My thoughts:
- Yes, if they're security-related.

-

Source:
+

My thoughts: Yes, if they're security-related.

+

Source: systemd GitHub Issue 5998

-
-

Issue #1 - CVEs Are Not Useful

-
"Humpf, I am not convinced this is the right way to announce this. We never did that, and half the - CVEs aren't useful anyway, hence I am not sure we should start with that now, because it is either - inherently incomplete or blesses the nonsensical part of the CVE circus which we really shouldn't +
+

Issue #1 - CVEs Are Not Useful

+
"Humpf, I am not convinced this is the right way to announce this. + We never did that, and half the CVEs aren't useful anyway, hence I am not sure + we should start with that now, because it is either inherently incomplete or + blesses the nonsensical part of the CVE circus which we really shouldn't bless..."

- Lennart Poettering, systemd lead developer

-

My thoughts:
- CVEs are supposed to be for security, and a log of when they were found and their severity, so yes, - it *is* the correct way to announce it. It seems as if over 95 security-concious people think the - same.

-

Source:
+

My thoughts: CVEs are supposed to be for security, and a log of when they + were found and their severity, so yes, it is the correct way to + announce it. It seems as if over 95 security-concious people think the same.

+

Source: systemd GitHub Issue 6225

-
-

Issue #2 - Security is a Circus

-
"I am not sure I buy enough into the security circus to do that though for any minor - issue..."
+
+

Issue #2 - Security is a Circus

+
"I am not sure I buy enough into the security circus to do that + though for any minor issue..."

- Lennart Poettering, systemd lead developer

-

Source:
+

Source: systemd GitHub Issue 5144

-
-

Issue #3 - Blaming the User

-
"Yes, as you found out "0day" is not a valid username. I wonder which tool permitted you to create - it in the first place. Note that not permitting numeric first characters is done on purpose: to - avoid ambiguities between numeric UID and textual user names. +
+

Issue #3 - Blaming the User

+
"Yes, as you found out "0day" is not a valid username. I wonder + which tool permitted you to create it in the first place. Note that not + permitting numeric first characters is done on purpose: to avoid ambiguities + between numeric UID and textual user names.

- systemd will validate all configuration data you drop at it, making it hard to generate invalid - configuration. Hence, yes, it's a feature that we don't permit invalid user names, and I'd consider - it a limitation of xinetd that it doesn't refuse an invalid username.
+ systemd will validate all configuration data you drop at it, making it hard to + generate invalid configuration. Hence, yes, it's a feature that we don't permit + invalid user names, and I'd consider it a limitation of xinetd that it doesn't + refuse an invalid username.

- So, yeah, I don't think there's anything to fix in systemd here. I understand this is annoying, but - still: the username is clearly not valid."
+ So, yeah, I don't think there's anything to fix in systemd here. I understand + this is annoying, but still: the username is clearly not valid."

- Lennart Poettering, systemd lead developer

-

My thoughts:
- systemd was the thing that allowed root access just because a username started with a number, then - Poettering blamed the user.

-

Source:
+

My thoughts: systemd was the thing that allowed root access just because a + username started with a number, then Poettering blamed the user.

+

Source: systemd GitHub Issue 6237