Bug 1532356 – CVE-2017-15130 dovecot: TLS SNI config lookups are inefficient and can be used for DoS

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Bug 1532356 - (CVE-2017-15130) CVE-2017-15130 dovecot: TLS SNI config lookups are inefficient and can be used for DoS

Summary:	CVE-2017-15130 dovecot: TLS SNI config lookups are inefficient and can be use...

Status:	NEW

Aliases:	CVE-2017-15130

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=low,public=20180228,reported=2...
Keywords:	Security

Depends On:	1532357 1551756 1551757
Blocks:	1538713
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Reported:	2018-01-08 12:42 EST by Pedro Sampaio
Modified:	2018-08-31 17:53 EDT (History)
CC List:	7 users (show)

See Also:
Fixed In Version:	dovecot 2.2.34, dovecot 2.3.1
Doc Type:	If docs needed, set a value
Doc Text:	A denial of service flaw was found in dovecot. An attacker able to generate random SNI server names could exploit TLS SNI configuration lookups, leading to excessive memory usage and the process to restart.
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Last Closed:
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Regression:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Pedro Sampaio 2018-01-08 12:42:03 EST

TLS SNI config lookups may lead to excessive memory usage, causing imap-login/pop3-login VSZ limit to be reached and the process restarted. This happens only if Dovecot config has local_name { } or local { } configuration blocks and attacker uses randomly generated SNI servernames.

Comment 2 Pedro Sampaio 2018-01-08 12:49:47 EST

Acknowledgments:

Name: The Dovecot Project

Comment 3 Adam Mariš 2018-03-01 05:47:56 EST

Reference:

http://www.openwall.com/lists/oss-security/2018/03/01/3

Comment 4 Pedro Yóssis Silva Barbosa 2018-03-01 08:23:56 EST

TLS SNI config lookups may lead to excessive memory usage, causing imap-login/pop3-login VSZ limit to be reached and the process restarted. This happens only if Dovecot config has local_name { } or local { } configuration blocks and attacker uses randomly generated SNI servernames.

Comment 6 Pedro Yóssis Silva Barbosa 2018-03-01 10:50:34 EST

External References:

https://www.dovecot.org/list/dovecot-news/2018-February/000370.html

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