Bug 57530 – dovecot CVE-2024-23185 CVE-2024-23184

Bug 57530 - dovecot CVE-2024-23185 CVE-2024-23184


Summary:	dovecot CVE-2024-23185 CVE-2024-23184

Status:	RESOLVED DUPLICATE of bug 57570

Product:	UCS
Classification:	Unclassified
Component:	UMC - Mail
Version:	UCS 5.0
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	---
Assigned To:	UMC maintainers
QA Contact:	UMC maintainers

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2024-08-20 13:10 CEST by Fabian Schneider
Modified:	2024-09-09 19:04 CEST (History)
CC List:	4 users (show)

See Also:
What kind of report is it?:	Security Issue
What type of bug is this?:	---
Who will be affected by this bug?:	---
How will those affected feel about the bug?:	---
User Pain:
Enterprise Customer affected?:
School Customer affected?:	Yes
ISV affected?:
Waiting Support:
Flags outvoted (downgraded) after PO Review:
Ticket number:	2024082021000051
Bug group (optional):	Security
Max CVSS v3 score:	7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

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Description Fabian Schneider

2024-08-20 13:10:47 CEST

the dovecot version served with UCS 5.0 has different bugs that allow easy DoS Situations with manipulated mails till version 2.3.21.1

This version is currently not available on ucs.

Comment 1 Mirac Erdemiroglu

2024-08-20 15:00:27 CEST

Further informations for the Bugs.


https://www.openwall.com/lists/oss-security/2024/08/15/4

https://www.openwall.com/lists/oss-security/2024/08/15/3

Comment 2 Arvid Requate

2024-08-26 12:10:32 CEST

* https://security-tracker.debian.org/tracker/CVE-2024-23184
* https://security-tracker.debian.org/tracker/CVE-2024-23185

Comment 3 Dirk Ahrnke

2024-08-26 14:33:35 CEST

The original report at https://dovecot.org/mailman3/hyperkitty/list/dovecot@dovecot.org/thread/TEVOFHCKWZW62C6NAM25S3K7CL6KUL2J/ says

"Incoming mails typically have some size limits set by MTA, so even largest possible header size may still fit into Dovecot's vsz_limit. So attackers probably can't DoS a victim user this way. ..."

vsz_limits are set to 256M by default in UCS. 
the relevant Postfix limits (header_size_limit and header_address_token_limit) are set to 10240 and message_size_limit can be controlled by UCRV mail/messagesizelimit which is usually set way beyond vsz_limit.

Comment 4 Dirk Ahrnke

2024-08-26 15:22:33 CEST

Of course the last words in my comment should read "below vsz_limit" instead of "beyond vsz_limit" and indicate that it will be hard to send a message through Postfix to Dovecot which addresses the vulnerability.

Comment 7 Arvid Requate

2024-09-09 19:04:08 CEST


*** This bug has been marked as a duplicate of bug 57570 ***